#help-with-arduino | adafruit | Page 96

wispy crater Jun 9, 2021, 11:48 PM

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?

limber mauve Jun 10, 2021, 2:41 AM

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anyone around who really knows samd51 DMA?

thorn spear Jun 10, 2021, 2:57 AM

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limber mauve anyone around who really knows samd51 DMA?

I could direct you somewhere where there are devs that have used the SAMD series and I believe they may be able to help you

limber mauve Jun 10, 2021, 2:58 AM

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I'm digging my way through the adafruit zero DMA source. I understand basically what's going on, but just have a few questions. Where do you have in mind?

thorn spear Jun 10, 2021, 2:59 AM

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limber mauve I'm digging my way through the adafruit zero DMA source. I understand basically ...

I'll direct you to them, sending a DM

limber mauve Jun 10, 2021, 3:02 AM

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Thanks!

thorn spear Jun 10, 2021, 3:04 AM

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I've asked the guys there on the topic and the one guy who knows about it isn't very friendly or nice, might be a good idea to scrap that idea, I'll keep looking for anyone who can help you

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Mind telling me which SAMD51 MCU you're using?

limber mauve Jun 10, 2021, 3:04 AM

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LOL fair enough!

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ATSAMD51G19A on the Adafruit ItsyBitsy.

thorn spear Jun 10, 2021, 3:08 AM

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By DMA you mean direct memory access feature right?

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Or DMA-Neopixel?

limber mauve Jun 10, 2021, 3:08 AM

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What I'm looking to implement (and currently sketching) is a ping pong DMA'ed buffer receiving off an SPI sercom. I understand the whole

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Setting up descriptors and all, but I've had trouble with Arduino dropping interrupts (probably due to USB?)

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So I don't want to be dependent on an ISR.

thorn spear Jun 10, 2021, 3:10 AM

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Have you checked the MCU datasheet?

limber mauve Jun 10, 2021, 3:10 AM

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I've been digging in that.

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I'm only really starting to dig into the guts of Arduino, even though I've had a pretty good read through the pertinent parts of the MCU data sheet.

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I've gotten SPI to work, and I've been doing this with an ISR, but I would love to have it be DMA and keep the processor out of the actual receive.

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My goal is to have a single start command that tells the DMA to pull data off the SPI, and then automatically rotate between two buffers (which seems it would be best as two descriptors)

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The data sheet seems to suggest that I can do a circular buffer by setting cross-coupled descriptors, but it also implies that I would have to light the DMA transfer back off every time I filled a buffer

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I would like to have this just automatically done, and the main loop handle processing of the data after the buffer is full or I've issued some sort of flush command.

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I'd like to just set an interrupt flag when DMA switches between buffers, and not actually have to involve the CPU in actually switching.

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Essentially, an infinite block transfer

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Or initiating a new block transfer as soon as the old one is done without CPU intervention

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There's not a ton of data, but it is extremely critical to get all of it, and it pops in every 30 us or so.

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Hence the interrupt loss issue, which is normally not a problem.

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And then I can use the CPU main loop to check if I flipped a buffer, and then read out that buffer.

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Also, I'll readily entertain the idea that I'm just doing it wrong :-)

north stream Jun 10, 2021, 3:18 AM

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I suspect you'll be stuck involving the CPU

limber mauve Jun 10, 2021, 3:19 AM

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I've also tried downgrading USB interrupts, but what I think is happening is it enters the USB interrupt and locks out nesting, so I lose the RXC interrupt.

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I'm also looking at trying tinyUSB instead of the Arduino standard

north stream Jun 10, 2021, 3:20 AM

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There are a few ways to deal with that. One is a "belt and suspenders" approach where the loop checks the buffer full flag as well as an ISR, so it'll get to a missed interrupt, just less fast. If your buffers are big enough (and your event loop efficient enough), that should be fine.

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I'd also suggest finding out why the interrupts are being lost

limber mauve Jun 10, 2021, 3:22 AM

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Yeah, I'm extremely curious to where that's happening. I would assume that the likelihood of losing an interrupt would be similar for SPI-RXC and DMA-done, but you'd have orders of magnitude fewer DMA-dones.

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The thing is, as I understand tinyUSB from some brief digging, it seems like you can run it even without USB interrupts? I'm using USB as CDC, and timeliness is not a concern wrt USB.

north stream Jun 10, 2021, 3:24 AM

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I doubt USB is your problem, and I'd worry that tinyUSB will eat into your CPU bandwidth.

limber mauve Jun 10, 2021, 3:25 AM

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Doesn't USB fire an interrupt every 1 Ms or so?

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ms, dammit

north stream Jun 10, 2021, 3:25 AM

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Yes, but I still don't think it's your problem

limber mauve Jun 10, 2021, 3:26 AM

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Informationally, I'm getting packets right at the 1 ms rate. It does still feel weird that it would be USB.

north stream Jun 10, 2021, 3:27 AM

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I hate to say it, because it's frustrating and difficult to debug, but it smells to me like a race condition.

limber mauve Jun 10, 2021, 3:28 AM

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But who would be racing who? Also, I'm dropping ~ 1-in-10000 RXC's.

north stream Jun 10, 2021, 3:28 AM

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I'm thinking the ISR needs to re-enable interrupts each pass through, and you have (effectively) two sources of interrupts with your two buffers.

limber mauve Jun 10, 2021, 3:28 AM

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And it has been frustrating and difficult, to be sure

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Actually, lack of clarity on my part. I'm losing the occasional interrupt just with having RXC fire an ISR and read the data, no DMA.

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And I'm looking to go to a DMA version to avoid that issue.

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And also to give some flexibility in the future for faster data flows

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I'm only firing one interrupt/ISR

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Except for USB

north stream Jun 10, 2021, 3:30 AM

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DMA will dilute the problem (as you described) but it may not cure it. It does have lots of advantages, but I would (reluctantly, but I'd do it) fix the RXC interrupt problem first, as it's going to be less rare and therefore quicker to nail down.

limber mauve Jun 10, 2021, 3:30 AM

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Which is why my nose is taking me that way

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I've started digging into the Arduino core code on the hunt for interrupts being fired, but I'm a circuit designer by trade and this is getting bloody. :-)

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I kind of know what I'm doing, but I don't claim to be more than an educated dilettante.

north stream Jun 10, 2021, 3:33 AM

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I've been there. I think you're going in the right direction looking at interrupt priority, and testing with just reads, but I'd suggest going further: catching the RXC interrupts and skipping the read, and seeing if it loses any.

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I have no EE degree, but many years of experience debugging bizarre problems.

limber mauve Jun 10, 2021, 3:34 AM

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I've been doing something very similar... Just dumping it into a circular buffer on receive. With SERCOM, you do have to read the data register or manually clear the interrupt.

north stream Jun 10, 2021, 3:34 AM

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So I to am a dilettante, but not an educated one (in the traditional sense, anyway)

limber mauve Jun 10, 2021, 3:34 AM

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Is there such a thing as an experienced dilettante?

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There are plenty of educated idiots.

north stream Jun 10, 2021, 3:34 AM

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If there is, I'd like to apply for the position! 😃

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I'd try that: skip the read and just manually clear the interrupt and see what happens. More data points = more chances for a clue.

limber mauve Jun 10, 2021, 3:35 AM

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Good point.

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Anyway, it is 11:30 on the East Coast, and I need to be a good engineer tomorrow. I appreciate the advice, and the chat!

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(also, the handle: 'what do you do for a living?' 'I make electrons go round and round.')

north stream Jun 10, 2021, 3:40 AM

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My current job is supporting IBM's "Watson" artificial intelligence products. My last job was freelancing building custom hardware. I'm on the east coast too and should also be getting some sleep.

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If it's not cloudy I may be getting up early to hopefully see the eclipse

wintry wadi Jun 10, 2021, 4:02 AM

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I just finished my embedded system's class and I was wondering if you guys had any good material to learn microcontrollers? I understand the basics of i2c, spi, and what not. Any thing you guys would recommend? Preferably one with a lot of hands on examples. Thanks!

north stream Jun 10, 2021, 2:26 PM

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The "Learn Arduino" guides on AdaFruit are handy. The first few may cover stuff you already know, but there are others that get into more details on interrupts, timers, etc. It rather depends on which aspects you're interested in.

wispy crater Jun 10, 2021, 3:43 PM

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https://pastebin.com/jthTfE11

this is the code
when i try to fetch it with JS from my website, it shows the following error
dashboard:1 Access to fetch at 'http://192.168.29.231/pumpoff' from origin 'http://smartgardenuserdashboard.herokuapp.com' has been blocked by CORS policy: The request client is not a secure context and the resource is in more-private address space `private`. dashboard:128 GET http://192.168.29.231/pumpoff net::ERR_FAILED (anonymous) @ dashboard:128 dashboard:1 Uncaught (in promise) TypeError: Failed to fetch

what is the problem and what do i need to add

Pastebin

sg's broken code - Pastebin.com

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

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PLS HELP

north stream Jun 10, 2021, 7:00 PM

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That's a CORS (cross-origin resource sharing) security violation. You'd have to do whatever the site requires to meet their security posture.

livid osprey Jun 10, 2021, 7:33 PM

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wispy crater https://pastebin.com/jthTfE11 this is the code when i try to fetch it with JS f...

Building off of what @north stream mentioned, I noticed your errors are using http URLs, and anything mentioning "secure" probably prefers https. Perhaps look into implementing WifiClientSecure?

terse smelt Jun 10, 2021, 7:35 PM

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Is there a GoPro wifi remote library for Arduino that supports adjusting the EV? (Exposure value) I found this one but I’m not sure if and how it works with adjusting EV https://github.com/aster94/GoProControl

GitHub

aster94/GoProControl

Arduino library to interface with GoPro cameras. Contribute to aster94/GoProControl development by creating an account on GitHub.

crisp folio Jun 10, 2021, 8:44 PM

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terse smelt Is there a GoPro wifi remote library for Arduino that supports adjusting the EV?...

Looks like it's documented here so shouldn't be too hard to add https://github.com/KonradIT/goprowifihack/blob/master/HERO4/WifiCommands.md

GitHub

KonradIT/goprowifihack

Unofficial GoPro WiFi API Documentation - HTTP GET requests for commands, status, livestreaming and media query. - KonradIT/goprowifihack

limber mauve Jun 10, 2021, 8:55 PM

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Stupid question: is there an in-depth explanation somewhere of how Arduino USB uses interrupts? It'd be a pretty advanced topic, and Google doesn't really show much. Not terribly afraid of UTSL, but if somebody's already done it, why not?

pine bramble Jun 11, 2021, 11:34 AM

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@limber mauve You can visit start.atmel.com

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Put together a working board support package for your MCU and try it out yourself.

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Then inspect the code used to do it.

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That would build some knowledge - not Arduino specific knowledge, though.

elder hare Jun 11, 2021, 11:56 AM

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// This wont turn off when brightness is 0
_Leds.data()[i] = ColorFromPalette(_ledsettings._palette_current, _ledsettings._palette_picker, Brightness, _ledsettings._palette_blend);

// But this will
_Leds.data()[i] = CHSV(96, 255, _ledsettings._pattern_brightness);

why? 😐

north stream Jun 11, 2021, 12:30 PM

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Is brightness an int or a float? Is FASTLED_SCALE8_FIXED set?

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Also Brightness != _ledsettings._pattern_brightness

elder hare Jun 11, 2021, 12:53 PM

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@north stream it's an int 🙂 FASTLED_SCALE8_FIXED is not set (did not know about that one) but never mind when i think about it! why would i need to turn them off in the first place 😅 if you have it on it is for displaying colors not to have them off 😅

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but i have another question tho

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is this just a "mind trick" or what? im confused!

from pixel(0) to end of strip is "forward"
and from end of strip to pixel(0) is "backward"

all of my other patterns behave this way but this TheaterChase pattern moves opposite

void LEDPattern::TheaterChase()
{
    fadeToBlackBy(_Leds.data(), _NumLeds, 255);

    for (int i = _pattern_position % 3; i < _NumLeds; i += 3)
    {
        _Leds.data()[i] = PaletteMode(i);
    }
}

if i set the number "3" here forward becomes backward and vice versa! but if i set the number 5 it becomes correct

north stream Jun 11, 2021, 12:56 PM

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Which 3? The modulo or the increment?

elder hare Jun 11, 2021, 12:57 PM

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both i guess

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i've not tried to set only the one

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but i have a guess that it is the modulo

north stream Jun 11, 2021, 12:58 PM

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I'm guessing it has to do with yet another modulo: the index modulo vs the length of the strip. If you add 1 LED to the strip, it may reverse or freeze. If you add 2 LEDs, it would change again (that is, if I'm even barking up the right tree here)

elder hare Jun 11, 2021, 1:02 PM

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oh lol ok uhm... so i just went to adafruit site and looked at how they did their Theater Chase pattern and it just worked

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changed it to this

    for (int i = 0; i < _NumLeds; i++)
    {
        if ( ( i + _pattern_position ) % 3 == 0 )
        {
            _Leds.data()[i] = PaletteMode(i);
        }
    }

livid osprey Jun 11, 2021, 2:56 PM

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So I have a fairly complex system that uses adafruit's ft6206 library for its touch interface, and one of the other controller boards has its own i2c comms as well, which I'm having trouble getting data from at the moment. How often does the ft6206 get polled, and can I reduce that by configuring a touch interrupt?

limber mauve Jun 12, 2021, 3:05 AM

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pine bramble <@!728095654932381699> You can visit `start.atmel.com`

Looks useful for understanding the microcontroller side, though.

pine bramble Jun 12, 2021, 9:35 AM

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@limber mauve I used it a lot the first summer I visited start.atmel.com.

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Helped me to contextualize what is going on. ;)

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DotStar for ATSAMD21G18A (no idea of what the state of this code is in, been a while):

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https://github.com/wa1tnr/atst_aa_rev03a

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Init is here, including what I'd labeled USB_0:
https://github.com/wa1tnr/atst_aa_rev03a/blob/master/driver_init.c#L119

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PA24/DM & PA25/DP there.

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This might be the interface to read in keystrokes (a different program):
https://github.com/wa1tnr/ainsu-CamelForth-d51-usb/blob/master/boards/trellis_m4_usb/src/cf/atsamdx1/atsamdx1_getkey_usb.inc#L5

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In atmel start not Arduino (at all):

unsigned int getKey(void) {     // hardware-independent wrapper
    while (strlen(usbd_cdc_in_buffer) == 0) {
        cdcdf_acm_read((uint8_t *) usbd_cdc_in_buffer,
                       sizeof(usbd_cdc_in_buffer));
    }
    uint8_t ch_read = (uint32_t) usbd_cdc_in_buffer[0];
    usbd_cdc_in_buffer[0] = '\0';
    usbd_cdc_in_buffer[1] = '\0';
    return ch_read;
}

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atmel start USB stuff uses callbacks which I don't really understand at all; still I was able to fake it fairly well (terrible buffering though).

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I tried to borrow from how CircuitPython does it but didn't get too far.

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(at the time, their USB stuff seemed to be based in atmel start paradigms)

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(They are now TinyUSB oriented, I think - whole other ball game)

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Really didn't figure out too much about how Arduino IDE handles USB connections.

limber mauve Jun 12, 2021, 12:05 PM

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I'm going to experiment with start.atmel--I do like the idea of having some programmatic help with the register setups.

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That all being said, I'm also thinking about experimenting with MPLABX.

unique moss Jun 13, 2021, 11:13 AM

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hi, so im learning python right now and when im done and after i do a few projects i want to get into hardware programming using circuit python, but i need to learn how the boards and the ports work first, can anyone recommend any courses to help me learn the hardware aspect of the arduino boards or just any microcontroller board in general

pine bramble Jun 13, 2021, 12:41 PM

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@unique moss People ask that question a lot.

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It's probably worth the conversation to explore what is and isn't of interest to you.

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The simplest microcontroller can blink an LED.

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That realizes in the physical world what was once just a typewriter-based conversation with a 'computer'.

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Blinking an LED produces light, which any person can see - and they don't need 'language' to do it.

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So that's hardware.

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Coding is more like, I type something in, and the computer types something back. Language skills are used for that.

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I would get whatever 'arduino' or compatible board strikes your interest, and a 'parts pal' (or similar) kit of electronics parts.

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Very little of that parts box will be used, initially.

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Introductory electronics starts with the flashlight idea (a bulb and a battery and a switch) and builds up knowledge from there.

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A test meter to read in Ohms, Volts and Milliamperes is essential for self-study.

unique moss Jun 13, 2021, 12:46 PM

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alright

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thanks alot

pine bramble Jun 13, 2021, 12:47 PM

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An assortment of resistors above 500 Ohms, up to 100,000 ohms and a few LED's and a couple of AA batteries in a holder, a pushbutton switch, some header pins to press into a breadboard (for easy to hookup test points) and a spool of hookup wire, wire strippers, and a breadboard.

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I'm sure they got kits with most of that (except for a meter) aren't very expensive.

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You only need the spool of wire and wire strippers if you don't buy pre-cut breadboard jumper wires in various short lengths (also as a kit).

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A flashlight with a series resistor to limit current flowing through the bulb is most of it - that's a complete 'circuit' and is the basis of all others, in introductory electronics.

unique moss Jun 13, 2021, 12:50 PM

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pine bramble A flashlight with a series resistor to limit current flowing through the bulb is...

alrighty

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thanks alot man

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i appreciate your help

pine bramble Jun 13, 2021, 12:50 PM

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When you get through 'Ohms Law' you're in good shape in this textbook:
https://www.allaboutcircuits.com/textbook/

unique moss Jun 13, 2021, 12:50 PM

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ill check it ouy

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thanks again

pine bramble Jun 13, 2021, 12:51 PM

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;)

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https://www.allaboutcircuits.com/uploads/articles/current-flow-ohms-law.jpg

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If you can, take a hands-on class in a school somewhere.

errant geode Jun 13, 2021, 9:09 PM

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Hello, is there any library to use rfid reader with attiny? I am asking because it probably uses spi, but attiny doesn't work with standard spi library.

crisp folio Jun 13, 2021, 9:42 PM

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Would depend a lot on the specific reader

median salmon Jun 13, 2021, 9:44 PM

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I'm sure there is a bit banging SPI library somewhere.

leaden ruin Jun 13, 2021, 9:54 PM

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Which attiny?

median salmon Jun 13, 2021, 9:59 PM

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A bit of google showed me that there is an SPI implementation for the ATtiny using the USI... https://github.com/tessel/avr-usi-spi/blob/master/spi_via_usi_driver.c

GitHub

tessel/avr-usi-spi

A USI Library implementing the SPI protocol specifically for AVR chips (tested on Attiny44/84) - tessel/avr-usi-spi

pallid sage Jun 14, 2021, 1:34 AM

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pine bramble When you get through 'Ohms Law' you're in good shape in this textbook: *<https:/...

I have to say that while Ohm's law is great, Kirchhoff's laws are something I wish I was exposed to, like 20 years earlier than I actually was
https://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws

Kirchhoff%27s_circuit_laws

elder hare Jun 14, 2021, 10:11 AM

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hmm looking into hooking up my ESP32 to the Twitch API via WebSocket so that i can listen to the twitch chat of my stream for certain commands beginning with ! but what im struggeling to find out is can my ESP32 (when connected to the twitch API) check if the person/client_id that sent that command has enough channel points and then subtract the amount? 🤔

livid osprey Jun 14, 2021, 1:24 PM

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elder hare hmm looking into hooking up my ESP32 to the `Twitch API` via WebSocket so that i...

If I remember correctly, you can't directly manage Twitch's channel points through their API, but you can use the API to listen in for custom rewards redemptions. The main drawback to this method is the lack of parameter definitions for custom point quantity redemptions.

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That's why most bots still have their own point system despite Twitch creating their own point integration.

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This may have changed, as my knowledge probably dates back a couple of years, though...

elder hare Jun 14, 2021, 1:34 PM

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@livid osprey hmmm well that sucks

pine bramble Jun 14, 2021, 4:16 PM

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pallid sage I have to say that while Ohm's law is great, Kirchhoff's laws are something I wi...

No doubt - they do cover Kirchoff as well as Thévenin (at least to name them and spend ten minutes on each of them) in a semester course in high school (hopefully ;)

feral pivot Jun 14, 2021, 8:29 PM

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Does anyone knows how to use a library in another library

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I made a library but I want to use a display library in it

north stream Jun 14, 2021, 9:28 PM

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I think just #include the header file, and make either a static instance or member instance if need be.

sudden surge Jun 15, 2021, 3:01 AM

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I am trying to use analog inputs on an Arduino Nano, and I am having some confusing issues. I have the Arduino connected to a breadboard, and if I let the value float on its own, it settles around 200-300. If I try to tie the pin to the ground pin using the breadboard, it continues to float around that 200-300 range, and if I try to connect it to 3v3 it goes up to around 600. Only if I connect them directly to the Arduino and skip the breadboard does it work correctly, going to 0 when tied to ground and going to 1023 when connected to 3v3. I have tried multiple different breadboards and connectors, but that did not help. Does anyone know why this behavior would happen?

north stream Jun 15, 2021, 3:19 AM

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Sounds like a funky breadboard

soft dust Jun 15, 2021, 11:08 AM

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Does anyone know a good tutorial to control servos with the adafruit servo shield and arduino uno?

north stream Jun 15, 2021, 12:06 PM

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There's a learn page that covers the basics: https://learn.adafruit.com/adafruit-16-channel-pwm-slash-servo-shield

Adafruit Learning System

Adafruit 16-channel PWM/Servo Shield

16 channels of servo-bustin' power

soft dust Jun 15, 2021, 12:10 PM

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Thanks for the link. However, it is not clear to me how to use this command to convert degrees to pulse lengths with SERVOMIN and SERVOMAX.

north stream Jun 15, 2021, 12:12 PM

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The map() function is just a numeric range converter: it converts a range of 0 to 180 to a range of SERVOMIN to SERVOMAX.

elder hare Jun 15, 2021, 2:45 PM

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has anyone used any of these and what would you recommend? 🙂

elder hare Jun 15, 2021, 3:44 PM

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im trying out the ESP_WifiManager_lite
it is booting up and displaying all sorts of info but i cant connect to it via the IP or host name displayed in the serial monitor :S

from the github it is stated

While in AP mode, connect to it using its SSID (ESP_ABCDEF) / Password ("MyESP_ABCDEF"), then open a browser to the Portal AP IP, default 192.168.4.1

this is what i get in the serial monitor when it boots

Starting ESP_WiFi using LittleFS on Espressif ESP32 Dev Module
ESP_WiFiManager_Lite v1.5.0
ESP_MultiResetDetector v1.1.1
LittleFS Flag read = 0xFFFE0001
multiResetDetectorFlag = 0xFFFE0001     
lowerBytes = 0x0001, upperBytes = 0x0001
No multiResetDetected, number of times = 1
LittleFS Flag read = 0xFFFE0001
Saving config file...
Saving config file OK
[WML] WiFi networks found:
[WML] 1: Altibox625721, -66dB
[WML] 3: Altibox276123, -81dB
[WML] 4: ASUS_2.4G, -81dB
[WML] 5: Turbo, -85dB
[WML] 6: Omni_7DAFD8, -88dB
[WML] 
stConf:SSID=ESP_7BE6E2E0,PW=MyESP_7BE6E2E0
[WML] IP=192.168.4.1,ch=9
F
Your stored Credentials :
Blynk Server1 = account.duckdns.org
Token1 = token1
Blynk Server2 = account.ddns.net
Token2 = token2
Port = 8080
MQTT Server = mqtt.duckdns.org
Stop multiResetDetecting
Saving config file...
Saving config file OK

wraith current Jun 15, 2021, 4:56 PM

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@elder harelooks like its using the multi reset detector method. reset multiple times in a row and it should boot up into config AP mode.

viral drum Jun 16, 2021, 4:53 PM

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Hey team, I'm trying to make a simple game on an ESP8266 feather using the OLED Featherwing for display and input. I'm also using Adafruit's GFX library to draw bitmaps. It's getting to the point to where my code is quite large, so I'd like to separate out some of the various functions to dedicated header files in Arduino IDE. For example, my game has multiple various "backgrounds," each of which is drawn to the display object via its own function. The issue I'm running into, however, is that if I move one of these draw functions to a separate header file, it can no longer write to the display object since it's out of scope. I'm fairly new to programming, so I'm not certain how best to approach this. Can anyone offer some advice/recommendations?

north stream Jun 16, 2021, 4:56 PM

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There are a few approaches, you can use inheritance or shared variables. I'll normally make a project-wide header file and declare the display/GFX object in it, then include that file in any module that needs access to it.

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Naturally the module that instantiates the object will include the header file too.

rough torrent Jun 16, 2021, 4:58 PM

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I think you can pass in the OLED object to the function as well, but you will still have to #include the headers files anyways.

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But I'm not sure how to do that :/

viral drum Jun 16, 2021, 5:02 PM

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@north stream Right now I'm creating the display object in setup() - are you saying I could create a header file and create it there instead? And that would make it a global object that all header files could access?

north stream Jun 16, 2021, 5:06 PM

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No, keep the place where you create/instantiate it where it is, but make sure it's not local to a function (or declared static) and then in the header file have an additional extern declaration for it.

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You're not moving it, just giving more modules access to it.

viral drum Jun 16, 2021, 5:15 PM

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That worked! Very cool, thanks so much 👍 😁

terse smelt Jun 16, 2021, 10:42 PM

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Does anyone have example code or a tutorial for using an ESP32 as a BLE client to connect to a device with a matching UUID and MAC address? Even better if i can send a command to the device. So far the examples i've used just scan all nearby devices and output their information to serial instead of finding a matching device and connecting.

elder garnet Jun 16, 2021, 10:52 PM

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I'm trying to write a rust library for interfacing with the Adafruit AirLift, which is an esp32-wroom-32f with the WiFiNINA firmware. I can't find any documentation for how to talk to it over SPI, and if possible I would like to avoid reverse engineering the wifinina arduino library.

elder hare Jun 17, 2021, 9:56 AM

#

im using this -> https://github.com/khoih-prog/ESP_WiFiManager_Lite and love it! but im having some difficulty trying to get my LED to

blink slowly when trying to connect to WiFi
blink fast when in configuration_mode

i've tried to controll the LED in my header file myWifi.h with delay() but this seems to crash/hault the configuration_mode (i see in the serial monitor that the "multiresetdetection" script spams the serial monitor when i use delay() to blink the LED :S

i've also tried using millis() but with no luck :/

GitHub

khoih-prog/ESP_WiFiManager_Lite

Light-Weight MultiWiFi/Credentials Manager for ESP32 (including ESP32-S2 and ESP32-C3) and ESP8266 boards boards. Powerful-yet-simple-to-use feature to enable adding dynamic custom parameters. para...

pallid sage Jun 17, 2021, 10:11 AM

#

if delay() kills it, a busyloop looking at the time may also fail?

elder hare Jun 17, 2021, 10:34 AM

#

@pallid sage this never triggers :S

        ESP_WiFiManager->begin( "testboard" );

        while ( WiFi.status() != WL_CONNECTED )
        {
            Serial.println("------------------------------------------- WIFI CONNECTING!");
            delay( 500 );
            digitalWrite( WIFI_LED, HIGH );
            delay ( 500 );
            digitalWrite( WIFI_LED, LOW );
        }

livid osprey Jun 17, 2021, 10:56 AM

#

elder hare <@!166818440873639936> this never triggers :S ```c++ ESP_WiFiManager->b...

Do you see the serial println at all...?

elder hare Jun 17, 2021, 10:57 AM

#

@livid osprey no :/

#

all i get is this

#

Starting ESP_WiFi using LittleFS on Espressif ESP32 Dev Module
ESP_WiFiManager_Lite v1.5.0
ESP_MultiResetDetector v1.1.1
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
LittleFS Flag read = 0xFFFE0001
multiResetDetectorFlag = 0xFFFE0001
lowerBytes = 0x0001, upperBytes = 0x0001
No multiResetDetected, number of times = 1
LittleFS Flag read = 0xFFFE0001
Saving config file...
Saving config file OK
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
[WML] bg: Ignore invalid WiFi PWD : index=1, PWD=
[E][WiFiMulti.cpp:187] run(): [WIFI] Connecting Failed (6).
[WML] WiFi connected after time: 1
[WML] SSID=Altibox625721,RSSI=-69
[WML] Channel=2,IP=192.168.10.141
[WS-Server] Websocket Version: 2.3.6
[WS-Server] Server Started.
Stop multiResetDetecting
Saving config file...
Saving config file OK
H

#

H = connected to wifi

livid osprey Jun 17, 2021, 11:01 AM

#

Maybe try adding serial.println(WiFi.status) before the while loop to observe the status prior to the while loop?

elder hare Jun 17, 2021, 11:47 AM

#

@livid osprey trying now!

#

@livid osprey did this

        ESP_WiFiManager->begin( tempBoardName.c_str() );

        Serial.println(" ");
        Serial.printf("Wifi Status : %d \n", WiFi.status());
        Serial.println(" ");

        while ( WiFi.status() != WL_CONNECTED )
        {
            Serial.println("------------------------------------------- WIFI CONNECTING!");
            delay( 500 );
            digitalWrite( WIFI_LED, HIGH );
            delay ( 500 );
            digitalWrite( WIFI_LED, LOW );
        }

#

output is this

Starting ESP_WiFi using LittleFS on Espressif ESP32 Dev Module
ESP_WiFiManager_Lite v1.5.0
ESP_MultiResetDetector v1.1.1
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
LittleFS Flag read = 0xFFFE0001
multiResetDetectorFlag = 0xFFFE0001
lowerBytes = 0x0001, upperBytes = 0x0001
No multiResetDetected, number of times = 1
LittleFS Flag read = 0xFFFE0001
Saving config file...
Saving config file OK
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
[WML] Hdr=ESP_WM_LITE,SSID=,PW=
[WML] SSID1=,PW1=
[WML] BName=NewBoard1234
[WML] bg: Ignore invalid WiFi PWD : index=1, PWD=
[WML] WiFi connected after time: 1
[WML] SSID=Altibox625721,RSSI=-65
[WML] Channel=2,IP=192.168.10.141

Wifi Status : 3

[WS-Server] Websocket Version: 2.3.6
[WS-Server] Server Started.
Stop multiResetDetecting
Saving config file...
Saving config file OK
HHH

livid osprey Jun 17, 2021, 12:07 PM

#

Yeah 3 means wl_connected

#

Your wifi is already connected by the time you reach your awaiting-connection while loop

#

ESP_wifimanager->begin() is either connecting to your network extremely quickly, or it holds the thread and only releases it after a successful connection.

livid osprey Jun 17, 2021, 12:10 PM

#

elder hare output is this ``` Starting ESP_WiFi using LittleFS on Espressif ESP32 Dev Modul...

I'm not experienced enough to tell you how to get the lights to blink while waiting for connection if you're already connected LOL

elder hare Jun 17, 2021, 12:26 PM

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https://www.digikey.no/product-detail/en/espressif-systems/ESP32-DEVKITC-32UE/1965-ESP32-DEVKITC-32UE-ND/12091813

does this not have an "on board LED" like a normal ESP32? 🤔

ESP32-DEVKITC-32UE Espressif Systems | RF/IF and RFID | DigiKey

Order today, ships today. ESP32-DEVKITC-32UE – ESP32-WROOM-32UE - Transceiver; 802.11 b/g/n (Wi-Fi, WiFi, WLAN), Bluetooth® Smart Ready 4.x Dual Mode Evaluation Board from Espressif Systems. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

odd fjord Jun 17, 2021, 12:56 PM

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@elder hare Looking at the Schematic https://dl.espressif.com/dl/schematics/esp32_devkitc_v4-sch.pdf the only LED appears to be the 5V power indicator.

elder hare Jun 17, 2021, 12:58 PM

#

hmm well that "kinda" sucks 😛 i have a LED on my pcb tho but again would be nice to have the onboard backup but...

odd fjord Jun 17, 2021, 12:59 PM

#

What do you mean by "normal" ESP32. There are many ESP32 boards.

elder hare Jun 17, 2021, 1:00 PM

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i know 😛 but i've been using the "DOIT ESP32 DEVKIT V1" and it has a blue LED onboard for "blink sketch" and stuff 😛

#

but 1 week ago i switched to ESP32-DEVKITC-32UE

wraith current Jun 17, 2021, 10:18 PM

#

@elder haremaybe try looking into running a blinking thread on the second core ? I've never done it but I know esp32 has more than one core.

elder hare Jun 18, 2021, 1:40 PM

#

anyone who can help me getting some LED magic on this lib -> https://github.com/khoih-prog/ESP_WiFiManager_Lite ? it has LED but only ON or OFF states... what i want is

**LED Off ** (nothing is going on / not connected to Wifi)
LED Slow Blinking (Trying to connect to wifi)
LED Fast Blinking (In configuration_mode)
LED On (connected to wifi)

i tried to using delay/millis and while loops in my myWifi.h header file but this seems to break the lib :S

GitHub

khoih-prog/ESP_WiFiManager_Lite

Light-Weight MultiWiFi/Credentials Manager for ESP32 (including ESP32-S2 and ESP32-C3) and ESP8266 boards boards. Powerful-yet-simple-to-use feature to enable adding dynamic custom parameters. para...

raw flame Jun 18, 2021, 1:57 PM

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Hello, lets say I wanna transfer a lot of data and really often to a microcontroller (ESP32, ESP32-S2, STM32 bluepill, etc.), what would be the best way to communicate from the Host (PC) to the MCU ?

Serial ?
Usb CDC ?
Something else ?

cedar mountain Jun 18, 2021, 2:54 PM

#

raw flame Hello, lets say I wanna transfer a lot of data and really often to a microcontro...

Generally serial would be the typical go-to default until you know you need something more complex. It should be good up to a few megabits/sec of transfer, so it depends a little on what "a lot of data" means. USB or Ethernet would be the main higher-speed but more complex alternatives, but they're not supported on every MCU.

raw flame Jun 18, 2021, 2:58 PM

#

cedar mountain Generally serial would be the typical go-to default until you know you need some...

Is there alot of commercial products that use Serial communication ?

#

in term of data it would be 3200bits few times per second

cedar mountain Jun 18, 2021, 3:07 PM

#

Commercial products would probably favor USB since it's easier from the user perspective even if more complex on the board side.

raw flame Jun 18, 2021, 3:08 PM

#

Okay, I need to find docs/tutorials for Usb communication in Arduino then

#

most things i found were for usbhost and usb hid

cedar mountain Jun 18, 2021, 3:10 PM

#

Note that commercial products generally wouldn't use Arduino, though.

raw flame Jun 18, 2021, 3:12 PM

#

u mean software wise (ESP-IDF, etc) or hardware ?

cedar mountain Jun 18, 2021, 3:13 PM

#

Both.

raw flame Jun 18, 2021, 3:14 PM

#

what type of hardware then ?

cedar mountain Jun 18, 2021, 3:16 PM

#

Depends on the product, but for microcontrollers it would be a custom board, and typically pretty cost-optimized.

#

I guess my main point is that if you're making a commercial product, there are a lot of considerations for the design. And if you're not making a commercial product, then copying what they do for a hobbyist project is not necessarily the right move, since they're following different rules.

raw flame Jun 18, 2021, 3:18 PM

#

Its for hobby but wanna do like a real product, if you understand

cedar mountain Jun 18, 2021, 3:21 PM

#

You certainly can, just bear in mind that it'll be more complicated that way.

raw flame Jun 18, 2021, 3:22 PM

#

thanks for your answers

next vine Jun 18, 2021, 5:49 PM

#

Hi, I built adafruit's sous vide Arduino, which uses adafruit's awesome RGB lcd shield, but I found it impossible to tune the PID parameters... I had to give up. Then I found this other code which doesn't use PID for temperature regulation, but it uses an 8 digit led display and I don't have one of those. Could someone make the code compatible with adafruit's lcd shield? The LED display would take months to arrive, I can't get it locally. Here's the code https://github.com/egiust/SousVideAdaptativeArduino would appreciate help a lot

GitHub

egiust/SousVideAdaptativeArduino

Adaptative regulation sous-vide cooker algorithm (for arduino) - egiust/SousVideAdaptativeArduino

#

Don't really know if what I'm asking is very complicated or time consuming to do, I started learning python recently but this is a bit too much for me

north stream Jun 18, 2021, 6:05 PM

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Basically, you'd have to narrow down where the code sends data to the display, remove the display specific bits, and replace them with code to write to the LCD.

next vine Jun 18, 2021, 6:31 PM

#

I wish I could do that but unfortunately my coding knowledge is very limited, maybe if someone over here could do that for me I could maybe send a free adafruit's RGB lcd shield PCB in exchange

livid osprey Jun 18, 2021, 7:10 PM

#

next vine I wish I could do that but unfortunately my coding knowledge is very limited, ma...

If you have someone refactor the code to support the LCD, why wouldn't you just keep the LCD haha

#

In my opinion, these DIY projects are meant to be a labor of love. If you really just wanted something working without taking the time to understand how it works, I would recommend spending the money on a consumer sous-vide instead. The amount of money it would cost to pay someone to reengineer the custom code may or may not be a lot depending on the individual, but for a price fair enough for someone to take the time to do it for you, you could probably afford a new sous-vide...

#

If you have questions regarding how to do it or where to start, feel free to ask. This discussion forum is here to help you fill in the gaps in your knowledge and support you in your DIY journey. Whether it's a question regarding libraries, hardware, or PID tuning, if someone knows the answer or at least something relevant that might help, they'll offer it.

next vine Jun 18, 2021, 7:20 PM

#

livid osprey If you have someone refactor the code to support the LCD, why wouldn't you just ...

I have several pcb's , wasn't saying to send my own soldered pcb haha

#

thanks anyways I understand now

#

I try to understand how it works but I enjoy gathering the components and soldering so I can't help but build stuff myself and then struggle with the code haha I'm learning to prevent this

livid osprey Jun 18, 2021, 7:35 PM

#

I'm wondering what you mean by being unable to tune the pod, actually. If you have the sous video built, code loaded, and pot filled with water, the auto tuning should get you pretty close?

brave meadow Jun 18, 2021, 7:38 PM

#

I have a Metro Express and I had circuit python on it. However I wanted to go back to Arduino but I can't seem to find the bootloader for Arduino, or maybe I am confused on what I am doing wrong because I can't seem to get things to upload ( I do not just have charing cable as the METROBOOT is available to upload a new UF2 file. The read light is fading in and out at all time no matter if I power cycle or not.

#

Not sure what to do at this point.

#

The board is showing up as Com12, I have the IDE setup with the SAMD board management and Arduino M0 selected

#

I got my bootloader from here: https://learn.adafruit.com/adafruit-metro-m0-express-designed-for-circuitpython/uf2-bootloader-details

Adafruit Learning System

Adafruit Metro M0 Express - Designed for CircuitPython

CircuitPython, Arduino IDE or even MakeCode with this Metro M0

#

And upload it to the bootload storage device and the device restarted when uploaded.

#

However it is still flashing/fading red in and out

brave meadow Jun 18, 2021, 8:11 PM

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I was able to upload the CircuitPython bootloader and that worked just fine. However I still can't seem to get Arduino to work

next vine Jun 18, 2021, 8:16 PM

#

livid osprey I'm wondering what you mean by being unable to tune the pod, actually. If you ha...

It should, but my rice cooker can't mantain a stable temperature because it loses heat from everywhere, I can't properly seal it and thus I can't find a stable temperature and do the autotuning

brave meadow Jun 18, 2021, 8:20 PM

#

wrong board selected... ugh

limber mauve Jun 19, 2021, 3:18 AM

#

Is there a port of the SDFat lib that uses DMA on the samd51?

#

Does the Adafruit port support DMA?

#

Nevermind. Apparently it does :-)

median mica Jun 19, 2021, 2:27 PM

#

I’m trying to use a servo to mechanically flip a light switch with a d1 mini and Alexa. I’m using a micro servo and with an uno I’m able to flip the switch, but I’d like to use just a d1 mini(esp8266). I’ve tried using external power(5v) for the servo but it doesn’t seem to have enough power to switch the switch. Any suggestions?

proud meadow Jun 19, 2021, 2:33 PM

#

Hello :)..
Can I somehow get rid of the Python-part of the bootloader on my Feather M0 Express and only have an Arduino-bootloader? I don't use the Python part and would like to reduce the startup-time and get rid of the annoying USB-drive that always reconnects when uploading a sketch what throws an error-message on MacOS every time..

north stream Jun 19, 2021, 2:58 PM

#

I wonder if there's an Optiboot port for the M0.

elder hare Jun 19, 2021, 6:06 PM

#

would this be possible on an ESP32? -> https://www.youtube.com/watch?v=7yY9odZnoJI&ab_channel=QuantitativeBytesQuantitativeBytes

YouTube

QuantitativeBytes

Turtle graphics in C++

Creating turtle graphics in C++ with the SDL library. Turtle graphics have been around for a long time, since the days that the programming language 'Logo' was taught in schools. The technique can be used to create some rather interesting graphics and also forms the basis of a range of fractal curves that I want to go on to explore in future epi...

▶ Play video

cedar mountain Jun 19, 2021, 7:02 PM

#

I'm not going to watch a 36-minute video to find out all the possible details, but the short answer is probably yes. The ESP32 is a pretty powerful microcontroller, and Logo used to run on an Apple ][ at a fraction of the capabilities.

wraith current Jun 19, 2021, 10:09 PM

#

@median mica what voltage was the servo getting while on the arduino?

ionic pewter Jun 20, 2021, 2:42 AM

#

how do I properly read analog input? my feather m0 spits out this

#

actually there's also straight text in there, what's the baud rate for the feather m0? I have mine set to 9600

north stream Jun 20, 2021, 2:46 AM

#

Normally you set the link speed in your sketch

#

Like Serial.begin(9600);

ionic pewter Jun 20, 2021, 2:46 AM

#

my sketch

north stream Jun 20, 2021, 2:47 AM

#

That does look like a speed mismatch, which is odd if you have the serial monitor set to 9600 as well

ionic pewter Jun 20, 2021, 2:49 AM

#

do you have a really simple "Hello world" i can use to sanity check? this is my specific board: https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module/

Adafruit Learning System

Adafruit Feather M0 Radio with LoRa Radio Module

Send your message really really far and wide

#

the blinking led sketch on the docs works just fine i should add

#


#if defined(ARDUINO_SAMD_ZERO) && defined(SERIAL_PORT_USBVIRTUAL)
  // Required for Serial on Zero based boards
  #define Serial SERIAL_PORT_USBVIRTUAL
#endif

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  Serial.begin(9600);
}

// the loop function runs over and over again forever
void loop() {
  int red = analogRead(A0);
  Serial.print("Red: " + red);
  delay(1000);
}``` 
update to my code

#

I tested without reading the analog, it works and I can read "Red: " in the console, but as soon as I try to throw in the analog value in there it spits out garbage

#

specifically ????

north stream Jun 20, 2021, 3:02 AM

#

Try ```arduino
Serial.print("Red: ");
Serial.println(red);

ionic pewter Jun 20, 2021, 3:04 AM

#

It works, thank you

median mica Jun 20, 2021, 3:26 AM

#

@wraith current I had the servo attached to the 5v pin, ground and pin 9. Based on the basic servo example.

#

@elder hare they have turtle in Circuit Python, and Circuit Python runs on an ESP32. https://learn.adafruit.com/circuitpython-turtle-graphics?view=all

Adafruit Learning System

CircuitPython Turtle Graphics

No shell scripts here... program turtle graphics in CircuitPython!

crisp bridge Jun 20, 2021, 3:31 AM

#

Hello. I am working with ProTrinketKeyboard lib and have a trouble. KEYCODE_LEFT_SHIFT does not take effect at all in
TrinketKeyboard.pressKey(KEYCODE_MOD_LEFT_CONTROL, KEYCODE_LEFT_SHIFT, KEYCODE_TAB)

It just does Ctrl+Tab. Any idea?

north stream Jun 20, 2021, 3:33 AM

#

When you say "does not take effect at all", do you mean within the library, over the wire, or the result on the system that receives it?

crisp bridge Jun 20, 2021, 3:38 AM

#

With and without KEYCODE_LEFT_SHIFT does the same.

#

As a result on the system, both does Ctrl + Tab.

cedar mountain Jun 20, 2021, 3:45 AM

#

ionic pewter I tested without reading the analog, it works and I can read "Red: " in the cons...

Just to explain what was going on there, the "+" operator wasn't doing what you expected in your print statement. Instead of concatenating "Red:" with the string form of the integer red, it was actually taking the pointer address of the constant string "Red:", adding the integer value of red to it, and outputting whatever bytes were at that memory location. Yay for C-style strings...

ionic pewter Jun 20, 2021, 3:46 AM

#

cedar mountain Just to explain what was going on there, the "+" operator wasn't doing what you ...

thanks for the clarification, im personally used to Java and C#

dusky jay Jun 20, 2021, 3:54 AM

#

https://cdn-shop.adafruit.com/datasheets/arduino_hole_dimensions.pdf
Not sure if im missing something, but what is the horizontal distance from the top right hole to the bottom right hole on the MEGA?

cedar mountain Jun 20, 2021, 4:03 AM

#

dusky jay https://cdn-shop.adafruit.com/datasheets/arduino_hole_dimensions.pdf Not sure if...

I agree it looks ambiguous. I don't see anything that specifies the horizontal position of the bottom right hole in this diagram.

dusky jay Jun 20, 2021, 4:03 AM

#

Thats somewhat of a relief, lol. I'll prob just print it out since its 1:1 and measure it myself

cedar mountain Jun 20, 2021, 4:07 AM

#

Another reference suggests the bottom-right hole is 0.2" from the right edge, or 0.25" from the top right hole.

#

https://arduinoinfo.mywikis.net/w/images/e/e7/S-arduino_mega_drawing.jpg

dusky jay Jun 20, 2021, 4:12 AM

#

I just checked with a PDF viewer and it got the same result

#

Thank you!

novel halo Jun 20, 2021, 4:46 AM

#

Hi, I have just got a blackpill and I try to use a lcd st7789 display with adafruit_gfx (which is working properly with my arduino nano). But the blackpill is not able to use the display with the same code. May I know that adafruit_gfx is not compatible with stm32duino that people need to modify the library to make it work on stm32duino? Thanks a lot!

surreal pawn Jun 20, 2021, 6:43 AM

#

@novel halo that library is probably trying to use the faster SPI mode that the samd boards have. You'll might have to poke around inside the library to see where it's going wrong

novel halo Jun 20, 2021, 7:14 AM

#

surreal pawn <@!420208546425077760> that library is probably trying to use the faster SPI mod...

I see, thanks for reply. I just found a st7789 stm32duino repo, which seems to be modified from adafruit gfx, I will try it first thanks!

elder hare Jun 20, 2021, 2:28 PM

#

https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA/tree/master/examples/AnimatedGIFPanel

is this only via SD-card or what? it is using SPIFFS...

GitHub

mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA

An Adafruit GFX Compatible Library for the ESP32 to drive 64x32px or 64x64px HUB75 LED matrix modules using the ESP32 DMA Engine for faster refresh rates. Supports panel chaining. - mrfaptastic/ESP...

pseudo abyss Jun 20, 2021, 4:20 PM

#

#

#

hi i tried burning a bootloader onto my new atmega328p

#

the device signature says 0x000000

#

and it says yIKES! and it doesn't work

#

is my chip dead

exotic pilot Jun 20, 2021, 4:48 PM

#

Hi, anyone got a ESP32 (esp32-uno) connected to MQTT with a weather shield (DEV-13956)?

north stream Jun 20, 2021, 5:47 PM

#

It could be a dead chip, or an incorrect connection. That crystal oscillator connection looks a little dodgy, you want those wires to be very short.

#

One thing you can try is using an external oscillator.

pseudo abyss Jun 20, 2021, 6:40 PM

#

hm, gotcha

leaden ruin Jun 20, 2021, 8:11 PM

#

That arduinoISP sketch was always a bit of a disappointment.

surreal pawn Jun 20, 2021, 10:07 PM

#

I'm using feather m0 and I'd like to go into deep sleep until a pin gets over a threshold voltage. How should I go about doing that?

limber mauve Jun 21, 2021, 3:01 AM

#

Are you thinking a precise threshold, or merely a digital input change?

surreal pawn Jun 21, 2021, 3:10 AM

#

ASF has two samples that would do what I need. One uses the ADC and the other uses the threshold compare

surreal pawn Jun 21, 2021, 4:15 AM

#

ugh, microchip studio shouldn't be failing to work just because I have python 3.8 installed

limber mauve Jun 21, 2021, 1:32 PM

#

facepalm

indigo elm Jun 22, 2021, 4:24 AM

#

I'm not sure where to ask this but what are the wiring and pin defines for connecting the eInk Breakout Friend and a ESP32 Huzzah Feather?

surreal pawn Jun 22, 2021, 4:53 AM

#

indigo elm I'm not sure where to ask this but what are the wiring and pin defines for conne...

https://learn.adafruit.com/adafruit-feather-huzzah-esp8266/pinouts

https://learn.adafruit.com/adafruit-eink-display-breakouts/pinouts
Good luck

Adafruit Learning System

Adafruit Feather HUZZAH ESP8266

WiFi with built-in battery charging for IoT on-the-go!

Adafruit Learning System

Adafruit eInk Display Breakouts and FeatherWings

Easy E-Paper With Built In Memory

wraith current Jun 22, 2021, 8:10 AM

#

@indigo elmthe pins to connect are different for the esp8266 and esp32 so make sure you figure that out.

elder hare Jun 22, 2021, 11:45 AM

#

Trying to read a file on the SD-Card (a gif image) and then using animationGIF lib to display it but it crashes what am i doing wrong?

Code : https://hastebin.com/tuqasadama.cpp
Crash: https://hastebin.com/ibecusiroy.apache

pallid grail Jun 22, 2021, 3:57 PM

#

@leaden walrus Does Arduino expect a newline at the end of a file like Python does, or does Arduino not care?

leaden walrus Jun 22, 2021, 3:59 PM

#

for code or serial prints?

pallid grail Jun 22, 2021, 3:59 PM

#

Code. As in a whole sketch.

leaden walrus Jun 22, 2021, 3:59 PM

#

; is essentially what newline does

#

and {} is the equiv for whitespace

pallid grail Jun 22, 2021, 4:00 PM

#

With Python, Pylint will complain if there is not a blank line at the end of a Python program. In this Arduino case, the last thing in this Arduino file is a function, so the last character is }.

#

Is that all I need then?

#

No blank line?

leaden walrus Jun 22, 2021, 4:01 PM

#

not sure for ci/linting. doubt the compiler cares. but linters are....linty. let me look at some recent stuff.

pallid grail Jun 22, 2021, 4:02 PM

#

Wait no.

#

I haven't sent this Arduino code through a linter yet.

#

I'm asking preemptively.

#

Oh I misread what you said. You're verifying.

#

Ignore me, heh.

#

Compiler definitely doesn't care, because there's no blank line in this and it works.

leaden walrus Jun 22, 2021, 4:02 PM

#

np. actually i bet if you just run clang it'll take care of whatever.

pallid grail Jun 22, 2021, 4:03 PM

#

I've never done that

leaden walrus Jun 22, 2021, 4:03 PM

#

it does what black does for cp

pallid grail Jun 22, 2021, 4:03 PM

#

Ah ok

leaden walrus Jun 22, 2021, 4:04 PM

#

https://learn.adafruit.com/the-well-automated-arduino-library/formatting-with-clang-format

pallid grail Jun 22, 2021, 4:04 PM

#

Fair enough. Thanks.

leaden walrus Jun 22, 2021, 4:04 PM

#

after you install, the key thing is the -i parameter

pallid grail Jun 22, 2021, 4:05 PM

#

duly noted.

#

I don't think it changed anything. So, go me, I guess.

leaden walrus Jun 22, 2021, 4:05 PM

#

without it, it just checks but doesn't actually do anything. -i makes it go ahead and edit in place, which is more like how black behaves

pallid grail Jun 22, 2021, 4:05 PM

#

Ah ok

leaden walrus Jun 22, 2021, 4:07 PM

#

i don't think it's very chatty. command runs. nothing reported. but does actually change.

#

you could do something like make a commit, then run clang, then see what the git diff shows. or run clang without the -i to see what it wants to gripe about.

pallid grail Jun 22, 2021, 4:08 PM

#

I looked at the file and it doesn't look any different, so I'm guessing I was ok. But 🤷‍♀️

#

Ah fair enough

leaden walrus Jun 22, 2021, 4:09 PM

#

yah. i just run it blindly as like a last step. some of it's formatting can be a bit 🤷 . but just have to accept it to pass.

pallid grail Jun 22, 2021, 4:21 PM

#

Thanks @leaden walrus! Appreciate the help as always.

leaden walrus Jun 22, 2021, 4:21 PM

#

np

indigo elm Jun 22, 2021, 4:44 PM

#

surreal pawn https://learn.adafruit.com/adafruit-feather-huzzah-esp8266/pinouts https://lear...

I followed that originally but it was a bit unclear WRT the esp32. I have another wrinkle that I'll post in a follow on question...

indigo elm Jun 22, 2021, 4:45 PM

#

wraith current <@!627710819412607016>the pins to connect are different for the esp8266 and esp3...

I figured as much, I think the write up on the AF website is older and there is very little about how to connect it to the ESP32. I had to resort to the picture, and guess.

#

Still not sure if this is the place to ask this but there is another BIG wrinkle to what I'm trying to do (WRT connecting an ESP32 to the eInk Breakout Friend). I'm hacking a solution. I'm trying to drive a Pimoroni eInk What (4.2" RBW) by connecting the EPD ribbon cable to the eInk BreakoutFriend. I'm not sure what the manufacturer is for the EPD so, it's basically a crap shoot. Thoughts? Should I move this question?

pine bramble Jun 22, 2021, 6:34 PM

#

HELLO i am trying to hook up a LSM6DS33 gyro sensor and i cant seem to figure out pinouts. Im using it to home a rotating arm. thank you!

vivid rock Jun 22, 2021, 6:36 PM

#

Have you checked this guide?
https://learn.adafruit.com/lsm6ds33-6-dof-imu=accelerometer-gyro

Adafruit Learning System

Adafruit LSM6DS33 6-DoF IMU Breakout

Take a measure of your orientation on six axes

pine bramble Jun 22, 2021, 6:42 PM

#

i found it

#

lol

civic umbra Jun 22, 2021, 7:08 PM

#

I know its not legal to use, but just for pentests, has anyone made a wifi deauther?

pine bramble Jun 22, 2021, 8:18 PM

#

so im running multiple steppers off of multiple adafruit stepper motor controlboards. and i want to use this sensor. But i cant seem to get it to work with the sheilds

#

can anyone help me?

vivid rock Jun 22, 2021, 8:33 PM

#

@pine bramble what exactly are you trying to do? how do you want to use this sensor?
and - if you forget about the shields, can you get data such as x-, y-, z- gyro reading from this sensor?

pine bramble Jun 22, 2021, 8:34 PM

#

yes i can get that data

#

i using it for a rotating arm

#

its to wrap candies. It as a claw that has another stepper motor and a it will have a large slip ring so it can spin freely

#

i need to use the sensor for homing

#

i need it pretty level

#

Here is a video

#

vivid rock Jun 22, 2021, 8:45 PM

#

the obvious and most straightforward algorithm would be:

compute the angle between the sensor and horizontal , say by using a.x^2+a.y^2 to measure deviation from horizontal -- if board is horizontal, then a.x, a.y are zero or very close to it. Note that I am using accelerometer, not gyro values
rotate the stepper until the board is horizontal

pine bramble Jun 22, 2021, 8:46 PM

#

yes i know hahahahaha

vivid rock Jun 22, 2021, 8:46 PM

#

Slightly more advanced version would slow done the rotation once the board is close to horizontal; this would make it easier

pine bramble Jun 22, 2021, 8:46 PM

#

well i was just gonna do the math

#

but that might be better cause then i dont have to think about the math

vivid rock Jun 22, 2021, 8:47 PM

#

you do not need math

pine bramble Jun 22, 2021, 8:47 PM

#

you know what i mean

#

i was going to home it then have it go a certain amount of steps

vivid rock Jun 22, 2021, 8:48 PM

#

well, let us first make sure we can home it, then talk about next steps

pine bramble Jun 22, 2021, 8:48 PM

#

the arms arent just going to go back and forth

#

they gonna twist and then realease the clamp

#

but i cant home it without knowing how to use the sensor with the motor control boards

vivid rock Jun 22, 2021, 8:50 PM

#

you use an arduino or similar board to control everything, right?

pine bramble Jun 22, 2021, 8:50 PM

#

yea uno

#

what do you have going on tonight? maybe we can hop in a vall

#

call

vivid rock Jun 22, 2021, 8:51 PM

#

so then here is the algorithm:

connect the motor control boards and sensor to arduino
start rotating the stepper
repeatedly get the sensor reading
stop rotating then a.x^2+a.y^2 is close enough to zero

#

sorry, busy day today, will have to go in 2 minutes

pine bramble Jun 22, 2021, 8:52 PM

#

bro i have this all planned out and diagrammed and everything

#

add me back

vivid rock Jun 22, 2021, 8:52 PM

#

what do you mean?

pine bramble Jun 22, 2021, 8:52 PM

#

about what part

vivid rock Jun 22, 2021, 8:52 PM

#

adding back

pine bramble Jun 22, 2021, 8:53 PM

#

on discord?

vivid rock Jun 22, 2021, 8:53 PM

#

sorry, I do not follow you. Sure we are on discord

pine bramble Jun 22, 2021, 8:53 PM

#

add me back as a friend

#

on discord😆

vivid rock Jun 22, 2021, 8:55 PM

#

oh. Sorry, I do not use this feature. You can reach me here when I am available without being my friend

#

got to run now, will see you later

pseudo abyss Jun 23, 2021, 1:47 AM

#

north stream It could be a dead chip, or an incorrect connection. That crystal oscillator co...

wait so what does device signature 0x000000 meann

#

#

okay it doesn't look like the chip is dead

#

because i put VCC and GND in, and i used the other vcc and gnd pins from the chip to power the led

#

and that seems to be working

#

so it seems like i just screwed up with the connections

hybrid plank Jun 23, 2021, 1:56 AM

#

that doesn't really mean anything. those might be just directly connected inside the chip

pseudo abyss Jun 23, 2021, 2:01 AM

#

aaaaaaaaagh

#

well I'm assuming it's not fried, though, right?

hybrid plank Jun 23, 2021, 2:08 AM

#

may be dead, may have been connected wrong, may have the incorrect fuse settings

north stream Jun 23, 2021, 12:25 PM

#

Normally 0x000000 (all zeros) or 0xffffff (all ones) mean a connection problem that keeps the data from being read properly.

pseudo abyss Jun 23, 2021, 3:02 PM

#

oh gotcha

elder hare Jun 23, 2021, 4:34 PM

#

i realy realy REALY need some help here! i've asked befor but have been unsuccessful at fixing this! my problem is; im trying to load a gif image from the SD-Card but the ESP32 Wemos crashes everytime it hits this line FSGifFile = SD.open(fname);

code;
https://hastebin.com/robohokino.cpp

Serial Monitor crash;
https://hastebin.com/otugatuxuz.yaml

cedar mountain Jun 23, 2021, 4:57 PM

#

My next step would be to decouple the SD stuff from the GIF library by just doing a manual open and read of a small text file on the card or something. I'm suspecting there's some problem with the SPI setup of the SD Card library, which isn't getting exposed until it actually tries to read something.

elder hare Jun 23, 2021, 4:59 PM

#

@cedar mountain i've done that and it worked super!

SD Card Type: SDHC
SD Card Size: 30436MB
Listing directory: /
  DIR : /System Volume Information
  FILE: /test.txt  SIZE: 1048576
  FILE: /foo.txt  SIZE: 13
  FILE: /34.GIF  SIZE: 2297211
  FILE: /Mandala2.gif  SIZE: 881482
Creating Dir: /mydir
Dir created
Listing directory: /
  DIR : /System Volume Information
  FILE: /test.txt  SIZE: 1048576
  FILE: /foo.txt  SIZE: 13
  DIR : /mydir
  FILE: /34.GIF  SIZE: 2297211
  FILE: /Mandala2.gif  SIZE: 881482
Removing Dir: /mydir
Dir removed
Listing directory: /
  DIR : /System Volume Information
Listing directory: /System Volume Information
  FILE: /System Volume Information/WPSettings.dat  SIZE: 12
  FILE: /System Volume Information/IndexerVolumeGuid  SIZE: 76
  FILE: /test.txt  SIZE: 1048576
  FILE: /foo.txt  SIZE: 13
  FILE: /34.GIF  SIZE: 2297211
  FILE: /Mandala2.gif  SIZE: 881482
Writing file: /hello.txt
File written
Appending to file: /hello.txt
Message appended
Reading file: /hello.txt
Read from file: Hello World!
Deleting file: /foo.txt
File deleted
Renaming file /hello.txt to /foo.txt
File renamed
Reading file: /foo.txt
Read from file: Hello World!
1048576 bytes read for 1153 ms
1048576 bytes written for 2482 ms
Total space: 30419MB
Used space: 4MB

cedar mountain Jun 23, 2021, 5:03 PM

#

Oh, this might be it. Your SPIClass object is a local variable of the setup() function, so it might not persist when the GIF library actually tries to access the card later in loop(). I'd change that to a global and see if it makes a difference.

elder hare Jun 23, 2021, 5:04 PM

#

testing now! 👍

scarlet cipher Jun 23, 2021, 5:06 PM

#

hello i have a question, can somebody help me?

elder hare Jun 23, 2021, 5:06 PM

#

@cedar mountain THERE WE GO 😄

#

thaaaaaaaaaaaaaaaaank you, SIR!

cedar mountain Jun 23, 2021, 5:08 PM

#

scarlet cipher hello i have a question, can somebody help me?

The rule of thumb is just to ask your question, rather than waiting for a volunteer who doesn't even know whether they will have the answer.

scarlet cipher Jun 23, 2021, 5:08 PM

#

ah cheers

#

i'm having a problem with the feather m0 adalogger, when i connect it to my computer i get an error balloon from windows saying, "USB device not recognized // The last USB device you connected to this computer malfunctioned, and Windows does not recognize it." I've tried many things including switching out the cables, USB ports, double-clicking the reset button during upload, switching a different board of the same model and turning on/off my computer. I've read on the forums that suggest updating the driver, but i can't do that since i operate the arduino IDE straight out of the extracted zip file it downloaded in (i've done this for years and i've never had an issue with it)

#

has anyone had an issue like this?

leaden walrus Jun 23, 2021, 5:17 PM

#

what version of windows?

scarlet cipher Jun 23, 2021, 5:25 PM

#

windows 10

leaden walrus Jun 23, 2021, 5:25 PM

#

shouldn't need any drivers

#

have you tried uploading a sketch yet?

scarlet cipher Jun 23, 2021, 5:27 PM

#

yes, i've tried the one i'm working on and blink. unfortunately neither have worked

leaden walrus Jun 23, 2021, 5:28 PM

#

blink is good for testing

#

you've gone through the arduino ide setup? to install SAMD board support?

scarlet cipher Jun 23, 2021, 5:29 PM

#

i have done that also

hybrid plank Jun 23, 2021, 5:30 PM

#

what do you mean by "operate the arduino IDE straight out of the extracted zip file it downloaded in" -- are you double-clicking the zip file and running the IDE out of there? or did you extract it first?

scarlet cipher Jun 23, 2021, 5:30 PM

#

i extracted it first

leaden walrus Jun 23, 2021, 5:31 PM

#

that should be fine also. it's pretty self contained.

#

what board are selecting in Tools->Board?

scarlet cipher Jun 23, 2021, 5:31 PM

#

"Adafruit Feather M0"

leaden walrus Jun 23, 2021, 5:31 PM

#

is it showing up in the Port list?

#

it = the COM port

scarlet cipher Jun 23, 2021, 5:32 PM

#

COM8 is showing up, which is new

#

it used to return nothing

#

but even that does not help the upload

leaden walrus Jun 23, 2021, 5:32 PM

#

windows can be weird with the COM port number

#

tends to bounce between two numbers between uploads

#

what error message do you get when you try to upload blink?

scarlet cipher Jun 23, 2021, 5:35 PM

#

update: COM8 just disappeared. i was able to get it to show up by double-clicking the reset button during the blink upload. Regardless of whether i have a COM port to select, the error is the following: "Couldn't find a Board on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board's reset button after initiating the upload."

leaden walrus Jun 23, 2021, 5:35 PM

#

try this trick:
https://learn.adafruit.com/adafruit-feather-m0-adalogger/faq#faq-2704880

scarlet cipher Jun 23, 2021, 5:36 PM

#

are you referring to the 3rd item down in the list?

leaden walrus Jun 23, 2021, 5:37 PM

#

yep. the "ack i did something" one.

scarlet cipher Jun 23, 2021, 5:37 PM

#

right okay, i have tried that one. that's what i mean when i say "double-click during upload"

leaden walrus Jun 23, 2021, 5:38 PM

#

did it successfully upload when you tried that?

scarlet cipher Jun 23, 2021, 5:38 PM

#

it did not

#

i still get the same, "Couldn't find a Board on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board's reset button after initiating the upload."

leaden walrus Jun 23, 2021, 5:39 PM

#

you got the error message above?

scarlet cipher Jun 23, 2021, 5:39 PM

#

correct

leaden walrus Jun 23, 2021, 5:40 PM

#

hmmm. what arduino ide version are you using?

scarlet cipher Jun 23, 2021, 5:41 PM

#

1.8.15

leaden walrus Jun 23, 2021, 5:41 PM

#

should be fine. what about the versions for the SAMD BSPs? both Arduino and Adafruit?

scarlet cipher Jun 23, 2021, 5:42 PM

#

i have both, i'm not sure what the version number is but i updated them last friday

#

arduino samd v1.8.10, adafruit v1.6.7

leaden walrus Jun 23, 2021, 5:44 PM

#

#

try updating those and see if it helps

scarlet cipher Jun 23, 2021, 5:45 PM

#

doing that now crossing all my appendages

#

still has an issue finding a port, for reference when i try to select it manually the option is unselectable

leaden walrus Jun 23, 2021, 5:51 PM

#

seems like something might be interfering

scarlet cipher Jun 23, 2021, 5:53 PM

#

aw man

elder hare Jun 23, 2021, 6:55 PM

#

have i done something wrong here? (trying to run the websocket on Core 0) i noticed when trying to connect to the ESP32 with all the libs running that it just hanged around for 5-7min befor connecting) so i thought it would be a good idea to have the socket on Core 0..

#include <Arduino.h>

#include "mythWifi.h"
#include "GIFDisplay.h"
#include "mythSocket.h"

TaskHandle_t Task1;

void Task1code( void * parameter)
{
  for(;;)
  {
    mythSocket::loop();
  }
}

void setup()
{
  Serial.begin(115200);

  mythSocket::begin();

xTaskCreatePinnedToCore(
      Task1code, /* Function to implement the task */
      "Task1", /* Name of the task */
      10000,  /* Stack size in words */
      NULL,  /* Task input parameter */
      0,  /* Priority of the task */
      &Task1,  /* Task handle. */
      0); /* Core where the task should run */
}

void loop()
{
  
}

but it keeps crashing :S

Error:
https://hastebin.com/depomojaze.less

#

hmm apparently i NEED to have a vTaskDelay(10); inside the Task....

scarlet cipher Jun 23, 2021, 7:53 PM

#

is there a way to fry a feather m0 from uploading?

north stream Jun 23, 2021, 9:41 PM

#

The worst thing I can think of would require it to be reloaded with SWD or somesuch.

rich coral Jun 23, 2021, 10:02 PM

#

is it possible to make sharp memory display auto scroll with println ?

young dust Jun 25, 2021, 10:21 AM

#

I've created a web server on my arduino which receives post requests and displays a message on the screen, but punctuation seems to be converted to some sort of %__ format

#

For instance "Hi there!" becomes message_content=Hi+there%21

#

Is anyone familiar with that format?

young dust Jun 25, 2021, 10:38 AM

#

Just realised it's showing characters so it's definitely hex

#

So solved

north stream Jun 25, 2021, 12:26 PM

#

Yes, that's "URL encoding". Spaces are converted to + and several other special characters are converted to % and their hex representation

livid osprey Jun 25, 2021, 12:27 PM

#

They become spaces now? Wow, long ago were the days of the dreaded %20s....

north stream Jun 25, 2021, 12:33 PM

#

%20 is also valid for spaces, but + is offered as a more compact option.

heavy star Jun 25, 2021, 12:41 PM

#

I like +

#

This+Is+The+Way

waxen hawk Jun 25, 2021, 8:15 PM

#

Hey guys, im a beginnerish to arduino. I was wondering if i am using the arduino ide, could it also compile .cpp and .h files in the same folder?

lone ferry Jun 25, 2021, 8:45 PM

#

Yep, just add them in the same folder @waxen hawk

waxen hawk Jun 25, 2021, 8:46 PM

#

lone ferry Yep, just add them in the same folder <@!238851726789181440>

Thanks for replying. I haven't experimented but can .ino files (acting as main) include helper c files and utilize their functions as wells?

lone ferry Jun 25, 2021, 8:49 PM

#

Yes. In a number of my own projects I have a main .ino file and the rest are .h and .cpp files.

waxen hawk Jun 25, 2021, 8:50 PM

#

Nice! glad to have that flexibility.

lone ferry Jun 25, 2021, 8:52 PM

#

The .ino file is treated a bit special by the compiler though. So if you need to use Arduino stuff in your .cpp files you need to #include <Arduino.h> at the top.

grim basalt Jun 26, 2021, 9:19 AM

#

Hello guys could anyone tell me what is trending and the latest mini project ideas based on Arduino

coarse breach Jun 26, 2021, 4:56 PM

#

Hi, I'm trying to work on FreeRTOS using Arduino, I've run into a few issues, can someone help me out?

#

I wanted to know the significance of an infinite loop inside a task, can that while(1) be replaced with say, an external hardware signal check statement so that the task executes only when I trigger it with a signal?

leaden walrus Jun 26, 2021, 5:19 PM

#

in general, when working with an RTOS, you create a bunch of "tasks", each of which is an infinite loop. it's the job of the RTOS to manage switching between each task. there are also various interprocess communication (IPC) mechanisms which are provided for doing additional coordination between tasks. so you'd want to retain the while(1) loop and find some other way to communicate the hardware signal to the task.

coarse breach Jun 26, 2021, 5:36 PM

#

Alright thank you! Appreciated

#

Just researched about vTaskSuspend() and vTaskResume(), looks like they might do the trick

cedar mountain Jun 26, 2021, 5:42 PM

#

A typical RTOS task will be waiting on some event most of the time, like a signal from an interrupt that would come through one of the OS notification mechanisms. I'd tend to shy away from explicitly suspending and resuming tasks.

coarse breach Jun 26, 2021, 5:45 PM

#

From the resources i've seen online, most of the tasks have a delay statement at the end, which lets the processor move to the other tasks. Will I be better off using a hardware interrupt if I want my code to be solely controlled by an external signal?

cedar mountain Jun 26, 2021, 5:46 PM

#

Generally, yes, since you'll get notified right away when the event happens, and don't need to have your task periodically polling for the status.

#

A standard pattern, for instance, is to have a semaphore that your task blocks on, which the ISR toggles when the hardware interrupt occurs.

coarse breach Jun 26, 2021, 5:48 PM

#

Oh wow, that sounds elegant, basically try making use of a binary sephamore that is toggled by a hardware interrupt in my task

#

Will give it a shot, thanks

elder hare Jun 27, 2021, 12:24 PM

#

can some explain to my why this crashes?

    uint8_t        _xyz[256] = { 0, 255, 0, 0 }; // { 0, 255, 0, 0, 255, 0, 255, 0 }
    CRGBPalette256 _myPal = _xyz;

Rebooting...
CORRUPT HEAP: multi_heap.c:432 detected at 0x3ffdfff8
abort() was called at PC 0x4008ce67 on core 0

ELF file SHA256: 0000000000000000

Backtrace: 0x40088b20:0x3ffdf900 0x40088d9d:0x3ffdf920 0x4008ce67:0x3ffdf940 0x4008d42c:0x3ffdf960 0x40081e5d:0x3ffdf980 0x40081e8e:0x3ffdf9a0 0x40086bb9:0x3ffdf9c0 0x4000beaf:0x3ffdf9e0 0x401676ff:0x3ffdfa00 0x400d7a6a:0x3ffdfa20 0x400d7ca5:0x3ffe3b90 0x4015c6c3:0x3ffe3bb0 0x4008495d:0x3ffe3bd0 0x40084b8c:0x3ffe3c20 0x40079247:0x3ffe3c40 0x400792ad:0x3ffe3c70 0x400792b8:0x3ffe3ca0 0x40079465:0x3ffe3cc0 0x400806da:0x3ffe3df0 0x40007c15:0x3ffe3eb0 0x4000073d:0x3ffe3f20

lone ferry Jun 27, 2021, 12:25 PM

#

CORRUPT HEAP means memory gets overwritten that shouldn't be

north stream Jun 27, 2021, 12:51 PM

#

There's a possibly-useful writeup about such issues here: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/heap_debug.html#finding-heap-corruption

river osprey Jun 27, 2021, 6:23 PM

#

I booted up Arduino IDE (windows 10) today and it forgot my boards, so I went to board manager, and reinstalled, but now when i go to compile, I get "recipe.preproc.macros pattern is missing" I'm trying to compile/upload for an Itsy Bitsy m4 express, but I think this is an arduino IDE issue - i tried re-installing all the drivers and boards, but it didn't work. Any thoughts?

leaden walrus Jun 27, 2021, 8:18 PM

#

there's one directory you need to manually delete for a true clean reinstall

#

C:\Users(username)\AppData\Local\Arduino15

mystic gate Jun 27, 2021, 8:31 PM

#

Hi guys, maybe someone knows what happends here? in this video you can see my ESP8266 with a Hlk-pm03 power supply and a solid state relay, i connect 2 10k resistor from 3.3v from ps, to 0 and 2 pin (using 0 as relay, and 2 as push button), a cable from 3.3v to EN pin in the ESP8266, when using it outside with a extension cord (from the wall to the power supply with a cord), works fine, then at the time of putting it the wall cables, works fine for a couple of minutes, but then it starts to do this thing in the video, blue led starts to blink very fast and the SSR too, (i think because the number 2 pin is used by the blue led), and it just does not work, do you know what could be the problem? here the video and the code.

#

demo

#

📎 message.txt

exotic rain Jun 27, 2021, 8:33 PM

#

Hello

#

I have a project that has to be done tonight. I really need help controlling a stepper motor. I have an image of it attached. I have zero arduino experience. All of the tutorials use a kind of stepper that I dont have and dont have time to order. I need to be able to control it with the picture of the attached potentiometer.

mystic gate Jun 27, 2021, 8:39 PM

#

do you have an stepper driver?

exotic rain Jun 27, 2021, 8:39 PM

#

yes

#

I have all of the components from this kit:https://www.amazon.com/gp/product/B01EWNUUUA/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

Amazon.com: ELEGOO Mega 2560 R3 Project Starter Kit Compatible with...

Amazon.com: ELEGOO Mega 2560 R3 Project Starter Kit Compatible with Arduino IDE MEGA 2560 - Including 16 Tutorials CD: Computers & Accessories

mystic gate Jun 27, 2021, 8:40 PM

#

https://www.youtube.com/watch?v=0qwrnUeSpYQ

YouTube

DroneBot Workshop

Stepper Motors with Arduino - Controlling Bipolar & Unipolar steppe...

Learn how to use stepper motors with the Arduino.

Full Article with Code at https://dbot.ws/stepper
More articles and tutorials: https://dronebotworkshop.com
Join the conversation on the forum: https://forum.dronebotworkshop.com
Subscribe to the newsletter and stay in touch: https://dbot.ws/dbnews

Today we will be working with stepper motors, ...

▶ Play video

exotic rain Jun 27, 2021, 8:40 PM

#

Does it show me how to control it with the 10K potentiometer?

mystic gate Jun 27, 2021, 8:41 PM

#

you need a digital potentiometer

#

and it's supper easy with the digital one

#

i don't know if you can do it with a 10k tho

exotic rain Jun 27, 2021, 8:42 PM

#

Do you build one with an arduino?

#

I dont have time to get one

mystic gate Jun 27, 2021, 8:43 PM

#

here

#

https://www.youtube.com/watch?v=t9DEAreCD3g

YouTube

MERT Arduino & Tech

Arduino analogRead Serial Monitor with Potentiometer

Arduino basic tutorial "analogRead" Serial Monitor with Potentiometer. Reads an analog input on pin A0, prints the result to the serial monitor.

Connections
Attach the center pin of a potentiometer to A0, and the outside pins to +5V and ground

Arduino UNO: https://amzn.to/2LZr6t4
Breadboard : https://amzn.to/3qxL
Jumper Wire: https://amzn.to/...

▶ Play video

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very easy to read the potentiometer value

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int sensorValue = analogRead(AO);

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AO is the analog pin from the arduino

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A0 i meant

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now look at the values the potentiometer gives, and look at the values the stepper needs

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then you can normalize the potentiometer values or something, and at the end use the first video to pass the values to the stepper

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here is your code, from the first video

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// Include the AccelStepper Library
#include <AccelStepper.h>

// Define Constants

// Define step constants
#define FULLSTEP 4
#define HALFSTEP 8

// Define Motor Pins (2 Motors used)

#define motorPin1 8 // Blue - 28BYJ48 pin 1
#define motorPin2 9 // Pink - 28BYJ48 pin 2
#define motorPin3 10 // Yellow - 28BYJ48 pin 3
#define motorPin4 11 // Orange - 28BYJ48 pin 4

#define motorPin5 4 // Blue - 28BYJ48 pin 1
#define motorPin6 5 // Pink - 28BYJ48 pin 2
#define motorPin7 6 // Yellow - 28BYJ48 pin 3
#define motorPin8 7 // Orange - 28BYJ48 pin 4

// Define two motor objects
// The sequence 1-3-2-4 is required for proper sequencing of 28BYJ48
AccelStepper stepper1(HALFSTEP, motorPin1, motorPin3, motorPin2, motorPin4);
AccelStepper stepper2(FULLSTEP, motorPin5, motorPin7, motorPin6, motorPin8);

void setup()
{
// 1 revolution Motor 1 CW
stepper1.setMaxSpeed(1000.0);
stepper1.setAcceleration(50.0);
stepper1.setSpeed(200);
stepper1.moveTo(2048);

// 1 revolution Motor 2 CCW
stepper2.setMaxSpeed(1000.0);
stepper2.setAcceleration(50.0);
stepper2.setSpeed(200);
stepper2.moveTo(-2048);

}

void loop()
{
//Change direction at the limits
if (stepper1.distanceToGo() == 0)
stepper1.moveTo(-stepper1.currentPosition());
if (stepper2.distanceToGo() == 0)
stepper2.moveTo(-stepper2.currentPosition());

stepper1.run();
stepper2.run();

}

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just remove the second stepper values and just do like this stepper1.moveTo(potentiometer_values);

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@exotic rain I hope it helps you.

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now, can someone help me please? I don't know what it happends and it's driving me crazy!

mystic gate Jun 27, 2021, 8:53 PM

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mystic gate Hi guys, maybe someone knows what happends here? in this video you can see my ES...

this comment please

pseudo abyss Jun 27, 2021, 9:29 PM

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north stream Normally `0x000000` (all zeros) or `0xffffff` (all ones) mean a connection probl...

okay i have spent 2 hours just inspecting this thing, i can't find any reason for it to not work other than it's dead. i'm attaching 2 images of this from 2 different angles, and i think i fixed the crystal connection

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http://3.bp.blogspot.com/-gniu_130zFA/VQXbdcjT35I/AAAAAAAAYiw/iN2YLWkPXOw/s1600/Selection_034.png

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this is the original thing i'm basing it off of, i even printed out the pinout of the chip and it all seems to make sense

north stream Jun 27, 2021, 10:03 PM

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The truth is that "it's dead" is indeed one of the possibilities, and, alas, an increasingly likely one as the others become less probable.

torpid reef Jun 28, 2021, 12:07 AM

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So honestly, I'd get the crystal right up against the chip and take the ceramic caps straight to the ground rail, no jumpers That's a lot of long jumper wires there that I'd be worried the crystal isn't getting started.

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I see you were having trouble getting the thing to read via programmer before, however, so not sure.

terse smelt Jun 28, 2021, 1:05 AM

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Does anyone familiar with ESP32 and BLE know how to pair after connecting to a device? It doesn’t have a PIN or passcode.

leaden ruin Jun 28, 2021, 1:19 AM

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https://www.instructables.com/How-to-use-Arduino-Mega-2560-as-Arduino-isp/

Instructables

How to Use Arduino Mega 2560 As Arduino Isp

How to Use Arduino Mega 2560 As Arduino Isp: When i build my Atmega328p-pu on a circuit board for my moped i needed to bootload it.
Because i have none external programming equipment i needed to use my Arduino Mega 2560 as ArduinoISP ( http://arduino.cc/en/Tutorial/ArduinoISP &n…

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Looks like you're not on the hardware SPI pins, @pseudo abyss .

light shale Jun 28, 2021, 1:33 AM

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pseudo abyss okay i have spent 2 hours just inspecting this thing, i can't find any reason fo...

The Mega has the SPI pins on different Digital Pins then the UNO. If you look at @leaden ruin link it shows. It gets confusing because the ISP example code give you the pins for the UNO and some of the online examples assume your using a UNO as well

pseudo abyss Jun 28, 2021, 1:43 AM

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ahhhhhhhhhhhhhhhh

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that would make a lot of sense

elder hare Jun 28, 2021, 8:45 AM

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is it true that if there is no client connect to my ESP32 in a while it will lose the DNS/hostname?

livid osprey Jun 28, 2021, 1:14 PM

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mystic gate Hi guys, maybe someone knows what happends here? in this video you can see my ES...

If you have a voltmeter, check the voltage drop across the resistor to 2? It might be a floating voltage.

mystic gate Jun 28, 2021, 1:41 PM

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livid osprey If you have a voltmeter, check the voltage drop across the resistor to 2? It mig...

ok let me check

opaque roost Jun 28, 2021, 2:27 PM

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Anyone know a faster way to update a tft screen instead of using fillScreen();

waxen hawk Jun 28, 2021, 6:09 PM

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Hi, do anybody know how to determine a sensor is analog or signal. I have largely using sensors using digital inputs (temperature, pressure) but I wanted to experiment with programming using analog pins (arduino uno). Is there a way to confirm whether a sensor is purely analog or capable of both digital and analog?

livid osprey Jun 28, 2021, 6:12 PM

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waxen hawk Hi, do anybody know how to determine a sensor is analog or signal. I have largel...

Google its datasheet, if you have the sensor's part number.

waxen hawk Jun 28, 2021, 6:13 PM

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livid osprey Google its datasheet, if you have the sensor's part number.

is there a way just be looking at the sensor (i.e. number of pins?)

livid osprey Jun 28, 2021, 6:14 PM

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waxen hawk is there a way just be looking at the sensor (i.e. number of pins?)

Not one that applies universally to every type of sensor in existence. What are you looking at?

waxen hawk Jun 28, 2021, 6:14 PM

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livid osprey Not one that applies universally to every type of sensor in existence. What are ...

Just confirming if HC-SR04 Ultrasonic sensor also output analog signals.

waxen hawk Jun 28, 2021, 6:15 PM

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livid osprey Not one that applies universally to every type of sensor in existence. What are ...

believes this is the only datasheet: https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf

livid osprey Jun 28, 2021, 6:17 PM

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As far as I know, hc-sr04 uses the time difference between a trigger pulse output and its reflection to measure distance.

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Not sure if there's any such thing as an hc sr04 with an analog output.

waxen hawk Jun 28, 2021, 6:18 PM

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I see. Perhaps i try a different sensor, I've looked this up and it said that it was analog but wanna confirm is LM35 temp sensor and photoresistor do output analog signals?

livid osprey Jun 28, 2021, 6:22 PM

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Lm35 looks to output an analog signal, yes. Photo resistors change their resistance based on the luminosity at its receiving surface, and will return an analog signal with the proper circuitry.

waxen hawk Jun 28, 2021, 6:23 PM

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livid osprey Lm35 looks to output an analog signal, yes. Photo resistors change their resista...

Great. Thank you. I appreciate having a confirmation.

livid osprey Jun 28, 2021, 6:32 PM

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opaque roost Anyone know a faster way to update a tft screen instead of using fillScreen();

Not that I know of, assuming you're restricted to the adafruit_gfx library and spi interface.

opaque roost Jun 28, 2021, 6:34 PM

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livid osprey Not that I know of, assuming you're restricted to the adafruit_gfx library and s...

thanks, i just found its easier to update the shape seperately instead of using fillScreen();

waxen hawk Jun 28, 2021, 10:27 PM

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Hi just asking around cuz StackO resources but have anybody use DHT11 temperature sensors. I've been largely getting nan values and using tillbart's library. (i can confirm the sensor works and connections are tight using a multimeter).

livid osprey Jun 29, 2021, 10:51 AM

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Not sure which library that is. Have you tried other libraries? Adafruit has its own here: https://learn.adafruit.com/dht

Adafruit Learning System

DHT11, DHT22 and AM2302 Sensors

Basic temperature & humidity sensors

solar plover Jun 29, 2021, 12:11 PM

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waxen hawk Hi just asking around cuz StackO resources but have anybody use DHT11 temperatur...

I used DHT11 couple of days ago and all I needed was Adafruit_Python_DHT library
https://github.com/adafruit/Adafruit_Python_DHT

GitHub

adafruit/Adafruit_Python_DHT

Python library to read the DHT series of humidity and temperature sensors on a Raspberry Pi or Beaglebone Black. - adafruit/Adafruit_Python_DHT

pure stag Jun 29, 2021, 2:40 PM

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yo Im trying to hook up a 8x8 led matrix to my arduino

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online some people use resistors while some not

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should I use it or

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eg.

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pseudo abyss Jun 29, 2021, 2:45 PM

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i think you should use resistors

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just in case

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also if you have details on your specific led matrix, find out how much resistance you need

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(am i doing well, helpers? are those good tips)

livid osprey Jun 29, 2021, 3:35 PM

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When in doubt, use a resistor. An ideal diode will have zero resistance, but having zero resistance mean you basically have a short circuit with infinite current. While that isn't ever the case in real life, a series resistor is always recommended to protect your arduino from drawing too much current from a single pin.

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If the brightness is too low, you can try a smaller resistance value, but I strongly recommend having a series resistance if you don't know it's internal resistance.

pure stag Jun 29, 2021, 5:00 PM

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okay thank you guys

tired gazelle Jun 29, 2021, 5:59 PM

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Hey yall, Its particle so its not the same thing, but im having an issue where my Particle Argon is not reading Air quality correctly in this script

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When I run the script that just checks for air quality alone, theres no problem, but im trying to make a script that combines reading data from a PM2.5 PMS5003 sensor, and a DHT22 for temperature humidity and airquality

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this is the script

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and this is the output I get

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and this is the output I get just running the script with the air quality sensor

pure stag Jun 30, 2021, 5:28 PM

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Hi

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I'm using this code to multiplex a 8x8 led matrix

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void pushFrame() {
    for (int row = 0; row < 8; row++) {
        setROW(row+1, HIGH);
        for (int col = 0; col < 8; col++) {
            if (frame_buffer[row][col] == true) {
                Serial.print(col);
                setCOL(col+1, HIGH);  
            }    
            delayMicroseconds(20); 
            setCOL(col+1, LOW);
        }
        setROW(row+1, LOW);
    }
}

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where frame_buffer is an 8x8 bool array

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but for some reason when I for example turn on light (1,1) the entire row behind it lights up too

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like this:

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anyone see why?

north stream Jun 30, 2021, 5:31 PM

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I don't know what setROW or setCOL do, but I'd move that delay() outside the col loop

pure stag Jun 30, 2021, 5:31 PM

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it just turns on/off the corresponding row/col indexed from 1 to 8

north stream Jun 30, 2021, 5:32 PM

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Actually have two col loops, one turns on the LEDs, then the delay, then one turns them back off. While that's not really your problem, it's more usual multiplexing practice.

pure stag Jun 30, 2021, 5:46 PM

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void pushFrame() {
    for (int row = 0; row < 8; row++) {
        setROW(row+1, HIGH);
        for (int col = 0; col < 8; col++) {
            if (frame_buffer[row][col] == true) {
                Serial.print(col);
                setCOL(col+1, HIGH);  
            }
        }
        delayMicroseconds(20);
        for (int col = 0; col < 8; col++) {
            setCOL(col+1, LOW);
        }
        setROW(row+1, LOW);
    }
}

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Like this I suppose u mean

pseudo abyss Jun 30, 2021, 7:21 PM

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#include <util/delay.h>

int main(void){

  DDRB = 0b00000011; // Sets PB0 and PB1 to outputs

  while(1){

    PORTB = 0b00000001; // Turns on only PB0
    _delay_ms(2000); // Delays 2000ms (2s)

    PORTB = 0b00000010; // Turns on only PB1
    _delay_ms(2000); // Delays 2000ms (2s)

     PORTB = 0b00000001; // Turns on only PB0
    _delay_ms(1000); // Delays 1000ms (1s)

    PORTB = 0b00000010; // Turns on only PB1
    _delay_ms(1000); // Delays 1000ms (1s)

     PORTB = 0b00000001; // Turns on only PB0
    _delay_ms(500); // Delays 500ms (0.5s)

    PORTB = 0b00000010; // Turns on only PB1
    _delay_ms(500); // Delays 500ms (0.5s)
    
  }
  return(0);
}```

```Arduino: 1.8.15 (Windows Store 1.8.49.0) (Windows 10), Board: "ATmega328, Yes (UART0), EEPROM retained, 328P / 328PA, BOD 2.7V, LTO disabled, External 16 MHz"

Warning: Board breadboard:avr:atmega328bb doesn't define a 'build.board' preference. Auto-set to: AVR_ATMEGA328BB

Sketch uses 142 bytes (0%) of program storage space. Maximum is 32256 bytes.

Global variables use 0 bytes (0%) of dynamic memory, leaving 2048 bytes for local variables. Maximum is 2048 bytes.

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x9d

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x9d

avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xe0

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xe0

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xe0

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xe0

avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xe0

avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xe0

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

Problem uploading to board.

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i uploaded the sketch and got this error

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i'm using an atmega328p that i MANAGED TO BURN THE BOOTLOADER ON

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THANK YOU @north stream @light shale @leaden ruin

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but yeah i tried uploading a sketch, it did not work

north stream Jun 30, 2021, 7:31 PM

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Hmm, is your port, board, and programmer set right? Is the cable working?

pseudo abyss Jun 30, 2021, 8:40 PM

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i mean, i'm using the same setup as the bootloader thing

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i didn't change anything except for wiring PB0 and PB1 to LEDs

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and just to make sure, i burned the bootloader a second time

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that works fine

pseudo abyss Jun 30, 2021, 9:00 PM

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north stream Hmm, is your port, board, and programmer set right? Is the cable working?

the port is fine, the board sHOULD be fine, the programmer miiight not be fine

lone ferry Jun 30, 2021, 9:02 PM

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Is this an official Arduino? If not, you will need to install additional drivers.

pseudo abyss Jun 30, 2021, 9:10 PM

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ah crap

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it's an elegoo one

leaden ruin Jun 30, 2021, 11:52 PM

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How do I write an Arduino sketch to a FunHouse board that is currently running CircuitPython? It resets and goes back into CP and the Arduino upload times out.

brittle merlin Jun 30, 2021, 11:56 PM

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Could anyone help me convert this micropython to Arduino, I've tried but I cant figure it out

    R = 6372.8 # For Earth radius in kilometers use 6372.8 km
    dLat = radians(lat2 - lat1)
    dLon = radians(lon2 - lon1)
    lat1 = radians(lat1)
    lat2 = radians(lat2)
    a = sin(dLat/2)**2 + cos(lat1)*cos(lat2)*sin(dLon/2)**2
    c = 2*asin(sqrt(a))
    calcDist = R * c * 1000
    calcDist = '{0:.2f}'.format(calcDist) # to 6 decimal places
    return calcDist```

cedar mountain Jun 30, 2021, 11:58 PM

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Most of the code should be pretty similar, though you'll probably have to #include <math.h> to get the trig functions.

brittle merlin Jul 1, 2021, 12:05 AM

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I got this far:

float distanceBetween(float lat1, float lon1, float lat2, float lon2){
    float R = 6372.8; // For Earth radius in kilometers use 6372.8 km
    float dLat = radians(lat2 - lat1);
    float dLon = radians(lon2 - lon1);
    lat1 = radians(lat1);
    lat2 = radians(lat2);
    float a = sin(dLat/2)**2 + cos(lat1)*cos(lat2)*sin(dLon/2)**2;
    float c = 2*asin(sqrt(a));
    float calcDist = R * c * 1000;
    calcDist = '{0:.2f}'.format(calcDist); // to 6 decimal places
    return calcDist;
}

but it throws up errors for two of the lines and its way over my head, errors:

sketch_jul01a:19: error: invalid type argument of unary '*' (have 'int')
float a = sin(dLat/2)**2 + cos(lat1)*cos(lat2)sin(dLon/2)**2;
sketch_jul01a:19: error: invalid type argument of unary '' (have 'int')
float a = sin(dLat/2)**2 + cos(lat1)*cos(lat2)*sin(dLon/2)**2;
sketch_jul01a:22: error: request for member 'format' in '775054973', which is of non-class type 'int'
calcDist = '{0:.2f}'.format(calcDist); // to 6 decimal places

Apologies if ive converted anything wrong.

leaden ruin Jul 1, 2021, 12:10 AM

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leaden ruin How do I write an Arduino sketch to a FunHouse board that is currently running C...

I held the BOOT button during Reset. After Reset the board was on a different COM port. I was then able to upload my sketch. Required a manual reboot, then it was on a third COM port. But it is now running! 🎉

cedar mountain Jul 1, 2021, 12:17 AM

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brittle merlin I got this far: ``` float distanceBetween(float lat1, float lon1, float lat2, fl...

Ah, C++ doesn't have the power operation, so you'll want to use the exp() function instead, or else just convert the square to a multiplication.

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And for the format(), there are other ways to do the string formatting, for instanceString distance = String(calcDist, 2);

pseudo abyss Jul 1, 2021, 12:41 AM

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@lone ferry how do i find out which drivers i need?

brittle merlin Jul 1, 2021, 12:58 AM

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brittle merlin I got this far: ``` float distanceBetween(float lat1, float lon1, float lat2, fl...

Not sure if this is the best way to do it but someone else made this up to do what I wanted

constexpr auto pi = 3.14159265358979323846;

double distanceBetween(double lat1, const double lon1, double lat2, const double lon2)
{
    const double d_lat = (lat2 - lat1) * pi / 180.0;
    const double d_lon = (lon2 - lon1) * pi / 180.0;
    lat1 = lat1 * pi / 180.0;
    lat2 = lat2 * pi / 180.0;

    const double a = pow(sin(d_lat / 2), 2) + pow(sin(d_lon / 2), 2) * cos(lat1) * cos(lat2);
    const double rad = 6372.8;
    const double c = 2 * asin(sqrt(a));
    return 1000 * (rad * c);
}

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Thank you to @cedar mountain who tried to help me even though im such a noob and was still confused lol

north stream Jul 1, 2021, 2:16 AM

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C uses a different idiom for exponentiation, but since it's simple squaring, you can just multiply it by itself.

severe thistle Jul 1, 2021, 8:30 AM

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Hey guys, so I have a couple of ESP32 boards which I am trying to use with the arduino ide

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So none of the esp32 boards that I have are detected by the ide. I have installed the drivers for the CP2102 chip but even that doesnt help. The port isn't detected at all and when it is detected it doesnt work, and some error shows up like esptool not installed (which i did install) or board not connected but the red light on the board is always on.

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I tried using VSCode and platformio but that seems to have its own set of problems with the libraries

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I have tried all the suggestions I could find on the internet. I have restarted my laptop connected the esp to a different port

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I am kind of lost here. Would appreciate if someone could help

north stream Jul 1, 2021, 12:31 PM

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Does the port even enumerate?

waxen hawk Jul 1, 2021, 3:54 PM

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Not sure if this is the best place to post my question, but do anybody have any suggestions in how to solder very small pins that are close together?

cedar mountain Jul 1, 2021, 4:08 PM

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You'll want a small-tipped soldering iron, small-diameter solder, and optical magnification of some sort. That last is surprisingly useful, since working under magnification actually improves your hand-eye coordination: the brain gets better feedback about what your fingers are doing.

north stream Jul 1, 2021, 5:50 PM

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And flux. Flux makes everything easier

pine bramble Jul 1, 2021, 6:09 PM

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Dudes
I have an esp32 and a stepper motor and a stepper motor driver (ULN2003A)
Ik that the driver is needed because the esp alone would get fried if it drove the stepper motor since motors do need a lot of current
But i simply dont know how i arrange the connections
Do they only need to share a common ground ?
Is it even possible to connect both to the same power supply ?
I find many different scheme which all show something different

north stream Jul 1, 2021, 6:33 PM

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Yes, a common zero volt reference is required, otherwise it should work. You can use a shared supply in this case, since the ESP32 has its own regulator which will isolate it from the electrical noise of the stepper.

pine bramble Jul 1, 2021, 6:48 PM

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Ok how do i have to connect it when i want to power the driver from a 12V max 2A power supply, and the ESP32 from a 5V max 200mA power supply

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I want to power the ESP32 from my laptop, but the high current that passes through the motor shouldnt pass through my laptop because it cant handle that much

north stream Jul 1, 2021, 6:51 PM

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That makes sense.

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So you'd plug the ESP32 into 5V, so it has power. You'd hook the stepper driver to the 12V supply so it too has power, then you'd connect the ESP32 0V reference to the stepper driver 0V reference.

pine bramble Jul 1, 2021, 6:53 PM

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Ok so it's almost the same

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Ill try it out

north stream Jul 1, 2021, 6:53 PM

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Yes, almost the same.

pine bramble Jul 1, 2021, 7:27 PM

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It works

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But it also works when there is no common ground

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Is it possible that the power line acts as a common ground ?

north stream Jul 1, 2021, 8:01 PM

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Possibly: some laptops supplies connect to earth ground. I don't know what you're using as a 12V supply. But as long as the MCU and the stepper driver can agree on what 0V is, you're good.

quasi crest Jul 2, 2021, 2:40 AM

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Hi guys, I'm currently working on connecting an adafruit QT Py to a flow sensor. The manufacturer provides arduino code to connect the sensor to an arduino uno. What would I need to add to this code to have it connect to the qt py instead? I've been having trouble with this and any help is appreciated, thanks.

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https://github.com/Sensirion/arduino-liquid-flow-snippets/blob/master/SF06/example_15_simple_measurement_SLF3x/example_15_simple_measurement_SLF3x.ino

GitHub

Sensirion/arduino-liquid-flow-snippets

Arduino Code Snippets for Raw Sensor Communication with Sensirion Liquid Flow Sensors - Sensirion/arduino-liquid-flow-snippets

rough torrent Jul 2, 2021, 3:08 AM

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it looks like it should be wire-i2c device and upload to qt py - what trouble are you having?

quasi crest Jul 2, 2021, 3:43 AM

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When I connect it and upload, it continuously sends the print on line 68 with an error

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Although, I'm not entirely sure what it translates to. Is the qt py unable to make a connection to the computer or the sensor itself?

north stream Jul 2, 2021, 12:20 PM

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Seems like an I2C problem, I'd probably run an I2C scan and see what the results are

fleet edge Jul 2, 2021, 2:37 PM

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Hi, currently running an Arduino mega fitted with a LSM303 IMU and a servo. My code reads compass headings and moves servo in order to follow a given heading ie 0deg , North. Code works perfectly. I've also got it connected to a Raspberry pi and can read the heading ad servo position on a Terminal via serial. ATM to change the desired heading I need to open the IDE ad change the script. How can I do this via serial.

📎 GoNorth2.ino

leaden walrus Jul 2, 2021, 2:42 PM

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you want to be able to enter Target at run time?

fleet edge Jul 2, 2021, 2:45 PM

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@leaden walrus That's correct. Its a boat that I'm trying to run semi auto. So ideally SSH into Pi and change Target when required.

leaden walrus Jul 2, 2021, 2:46 PM

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the mega is attached to the pi?

fleet edge Jul 2, 2021, 2:46 PM

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Correct via usb at present.

leaden walrus Jul 2, 2021, 2:47 PM

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one idea would be to ditch the mega and control everything directly from the pi. you'd switch to python in that case.

north stream Jul 2, 2021, 2:48 PM

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I figured the question was "how to accept serial data in the sketch and use it to populate a variable"

leaden walrus Jul 2, 2021, 2:48 PM

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otherwise, you can try sending to the mega over the serial port - i.e. serial monitor

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https://www.arduino.cc/reference/en/language/functions/communication/serial/read/

north stream Jul 2, 2021, 2:51 PM

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Something like ```arduino

#define BUFSIZE 32

static char buffer[BUFSIZE];
static char * bp = buffer;
static char * bend = buffer + BUFSIZE;

void loop()
{
int ch;

if (Serial.available()) {
// read serial byte into ch
if (ch == '\n') {
*bp++ = '\0';
Target = atoi(buffer);
bp = buffer;
} else {
if (bp < bend) {
*bp++ = ch;
}
}
}

fleet edge Jul 2, 2021, 2:55 PM

#

@north stream would you mind explaining the script I'm rather a noob.

leaden walrus Jul 2, 2021, 2:57 PM

#

might need to call read()?

#

https://www.arduino.cc/reference/en/language/functions/communication/serial/available/

north stream Jul 2, 2021, 2:57 PM

#

Yes, that's what the comment is for: I couldn't remember the "get a byte" routine and was just banging that off from memory.

#

In short, it collects a character at a time until it finds a newline, then it terminates the string and hands the result off to the atoi() routine to convert it into an integer.

cedar mountain Jul 2, 2021, 2:59 PM

#

(I think you may have a chance of buffer overflow when doing the null termination case.)

north stream Jul 2, 2021, 3:04 PM

#

Yes, I skimmed over a lot of details

#

This is not finished, ready to run code, just an illustration of how one (of many possible) approaches might work

exotic rain Jul 2, 2021, 3:07 PM

#

Hello

#

I need some help understanding this schematic

#

📎 schematic.pdf

#

I do not know much about arduino yet

north stream Jul 2, 2021, 3:09 PM

#

Note: it's easier for people to post a picture instead of something they have to download and then open in a separate app

exotic rain Jul 2, 2021, 3:10 PM

#

O Sorry about that

#

📎 schematic.fzz

north stream Jul 2, 2021, 3:10 PM

#

The schematic is pretty straightforward, it's a bunch of switches wired to inputs, and some shift registers to control some LEDs

exotic rain Jul 2, 2021, 3:10 PM

#

Do you know how to make it in fritzing?

#

I am using these switches https://www.amazon.com/gp/product/B00004WLK8/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Amazon.com: Gardner Bender GSW-125 Electrical Toggle Switch, SPST, ...

Buy Gardner Bender GSW-125 Electrical Toggle Switch, SPST, ON-OFF, 6 A/125V AC, 6 inch Wire Terminal: Toggle Switches - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

north stream Jul 2, 2021, 3:11 PM

#

An actual picture like this is easier

exotic rain Jul 2, 2021, 3:13 PM

#

What do you mean?

north stream Jul 2, 2021, 3:28 PM

#

I mean that it's easier for people to view actual pictures (which show up directly in Discord) than files like PDF and FZZ that they have to download and then view in a separate application.

exotic rain Jul 2, 2021, 3:39 PM

#

Oh ok i am sorry

north stream Jul 2, 2021, 3:42 PM

#

No worries, just something for future reference

pine bramble Jul 2, 2021, 6:05 PM

#

Dudes ok now i have a 12v max 2.5A power supply which is connected to one device that needs 12v but now i want to add another device to that same power supply but this device needs only 5v

#

What can i do to regulate the 12v down to 5v only for that one device

#

A voltage divider doesnt work because the supplied voltage depends on the current consumed by the device

stable forge Jul 2, 2021, 6:08 PM

#

https://www.adafruit.com/product/4739

MPM3610 5V Buck Converter Breakout - 21V In 5V Out at 1.2A

This little buck converter based on the MPM3610 is a marvel, taking up to 21V input and providing a 5V output with up to 1.2A current. It's great for supplying power to popular 5V ...

#

https://www.adafruit.com/product/1385

UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output

Your power supply problems just got SOLVED! This little circuit board may look tiny but inside is a high efficiency DC/DC step-down converter which can output up to 3 Amp at 5V without the ...

#

etc. https://www.adafruit.com/category/139

#

@pine bramble ^^

pine bramble Jul 2, 2021, 6:10 PM

#

Is there no simple circuit that i can build myself

stable forge Jul 2, 2021, 6:10 PM

#

you need a regulator IC. and some extra components,

#

e.g. https://www.adafruit.com/product/2164

#

it's a linear regulator, so it will waste power. Needs a few caps

#

the buck converter is cheap enough and is more efficient

#

https://www.adafruit.com/product/2236 if you don't need that much current

5.0V 250mA Linear Voltage Regulator - L4931-5.0 TO-92

Need a nice little 5V regulator? We rather like the very-low-dropout L4931 from ST! This little guy will help you get your 5.5-20V battery or wall adapter down to a nice clean 5V with 2% ...

#

there are thousands of regulators available as parts

#

@pine bramble if it's not a lot of current, you can use a zener diode also: http://www.calculatoredge.com/electronics/zener.htm

waxen hawk Jul 2, 2021, 7:09 PM

#

cedar mountain You'll want a small-tipped soldering iron, small-diameter solder, and optical ma...

👍

waxen hawk Jul 2, 2021, 7:12 PM

#

north stream And flux. Flux makes everything easier

Thanks, flux definitely help. Also helps deoxidize stuff.

#

I was able to solder my stepper motor (to impart some wisdom to other soldering beginners, make sure to use a wick cuz i made a lot of mistakes). Do anybody have suggestion of how to make stepper motor produce a frequency? (using it produce a scale i.e. 440 HZ = A4 note) I'm using #include <Adafruit_MotorShield.h> library with the adafruit motor shield.

north stream Jul 2, 2021, 7:44 PM

#

You could work backwards from the frequency to figure out what the commanded motor speed should be to step at that frequency, or work around it so you could drive the step input with a PWM output you control.

waxen hawk Jul 2, 2021, 7:52 PM

#

north stream You could work backwards from the frequency to figure out what the commanded mot...

Do you know if there is a formula relating motor speed relate to sound frequency?

lone ferry Jul 2, 2021, 8:29 PM

#

I'm assuming freq = RPM * 60

#

Or / 60

north stream Jul 2, 2021, 8:30 PM

#

It would something like (steps per revolution * phases per step) / (RPM * 60) or somesuch

#

er, not sure either.

waxen hawk Jul 2, 2021, 8:38 PM

#

Yeap, i think the correlation between sound frequency and speed is still unclear (speed does relate to frequency but not sure how much and adafruit forums don't have concrete answers).
I am investigating a bit for now but for everyone's information (or if you guys are interested): there is a very awesome guide of someone's project: https://github.com/jzkmath/Arduino-MIDI-Stepper-Motor-Instrument. However, I am using the provided motorshield v2.3 to drive instead of the A4988 Stepper Driver so i don't know if i can control PWM from motor shield.

north stream Jul 2, 2021, 8:41 PM

#

I suppose you could look at the source code for the library to find the calculation it uses from RPM to pulse rate and just invert that (since pulse rate is what you want)

waxen hawk Jul 2, 2021, 8:41 PM

#

Thats a good suggestion! I will try looking at that too.

wise socket Jul 2, 2021, 9:19 PM

#

https://github.com/Sensirion/arduino-liquid-flow-snippets/blob/master/SF06/example_15_simple_measurement_SLF3x/example_15_simple_measurement_SLF3x.ino

GitHub

Sensirion/arduino-liquid-flow-snippets

Arduino Code Snippets for Raw Sensor Communication with Sensirion Liquid Flow Sensors - Sensirion/arduino-liquid-flow-snippets

wise socket Jul 2, 2021, 9:20 PM

#

wise socket https://github.com/Sensirion/arduino-liquid-flow-snippets/blob/master/SF06/examp...

I am trying to use this code to connect a sensirion sensor to a qt py and I have double checked the pins and it shows up on an I2C scan

#

However it does not get past the initial do while loop that checks if the sensor is being found

cedar mountain Jul 2, 2021, 9:40 PM

#

It might help if you print out the return code from endTransmission(), since it'll specify when the NACK happened.

wise socket Jul 2, 2021, 10:02 PM

#

cedar mountain It might help if you print out the return code from `endTransmission()`, since i...

I am away from my computer at the moment but I will revisit this with you later if you don't mind

cedar mountain Jul 2, 2021, 10:59 PM

#

wise socket I am away from my computer at the moment but I will revisit this with you later ...

Sure. Just continue to post info and questions to the channel, and if I'm not around, someone else will likely pop in to help... there's a lot of experience with I2C issues here.

surreal pawn Jul 3, 2021, 3:26 AM

#

What version of ASF does https://github.com/adafruit/Adafruit_ASFcore use? I'm guessing 3.29 which isn't listed for download on https://www.microchip.com/mplab/avr-support/avr-and-sam-downloads-archive

GitHub

adafruit/Adafruit_ASFcore

ASF core files for Zero. Contribute to adafruit/Adafruit_ASFcore development by creating an account on GitHub.

#

I'm essentially trying to combine the ASF AC deep sleep example with an arduino sketch on feather m0 and I'm hoping it's easier to add the parts of ASF I need to the library than to drop arduino and somehow get everything running on ASF, or port sample code away from ASF

#

also the 3.9.1 download doesn't work

#

actually, the downloads archive list isn't sorted correctly and 3.29 is there

alpine girder Jul 3, 2021, 8:39 PM

#

Hey im a complete newbie and im trying to figure out what all i need to get neopixels connected to my arduino, when i look at the guides they recommend to use a capacitor, but when i watch videos on the subject almost nobody uses one, what all do i need to buy to get neopixels up and running on my arduino?

pale drift Jul 3, 2021, 8:58 PM

#

hi @alpine girder , I hadn't used caps in-line w/neopixels in the past, but I have had enough problems with them in costumes etc. that I do now. They'll work fine without that extra 1000uf capacitor until they get a power spike of some sort caused by some other short down the line etc.

#

adafruit's own guide is the best: https://learn.adafruit.com/adafruit-neopixel-uberguide/powering-neopixels

Adafruit Learning System

Adafruit NeoPixel Überguide

Everything you always wanted to know about Adafruit NeoPixels but were afraid to ask

modest python Jul 3, 2021, 10:27 PM

#

All -i don't seem to get any power when i plug in an external power supply to the boards jack..is this a thing? i thought it would draw power automatically

modest python Jul 3, 2021, 10:29 PM

#

modest python All -i don't seem to get any power when i plug in an external power supply to th...

Arduino Uno

north stream Jul 3, 2021, 10:37 PM

#

Some have a power switch you need to set for them to come on. You can also check the external supply to see if it's the proper voltage/polarity/type.

modest python Jul 3, 2021, 10:43 PM

#

north stream Some have a power switch you need to set for them to come on. You can also chec...

5v power supply - checked it works with another device (guitar effects pedal) and i can't see anything on the arduino uno to switch the power on to it once plugged in-google seems to say it should choose power source automatically

exotic rain Jul 4, 2021, 12:57 AM

#

Does anybody have an idea on how to use these switches with an uno?

Screen_Shot_2021-07-03_at_8.56.59_PM.png

woeful drift Jul 4, 2021, 2:50 AM

#

Do you need to carry all that current that they're rated for or are you using them more for the look of the switch?

#

I guess I mean to ask are they for controlling a larger load or simply just for input to the Arduino?

north stream Jul 4, 2021, 3:44 AM

#

In general, hook the switch between a GPIO pin and ground, and configure the pin as INPUT_PULLUP. Then when the switch is open, it will read high (due to the pullup), and when the switch is closed, it will read low (due to the switch pulling the pin to ground).

limber mauve Jul 4, 2021, 5:51 AM

#

That is a ...lot of switch for an Arduino project.

crimson radish Jul 4, 2021, 7:01 AM

#

How could I specify the i2c pins for a BMP280 using the Adafruit BMP280 library

cedar mountain Jul 4, 2021, 2:32 PM

#

crimson radish How could I specify the i2c pins for a BMP280 using the Adafruit BMP280 library

It looks like you can pass in a TwoWire object in the constructor, if you're using a nonstandard I2C bus.

mystic gate Jul 4, 2021, 4:48 PM

#

livid osprey If you have a voltmeter, check the voltage drop across the resistor to 2? It mig...

sorry for not answering, had a rough week, and how can I fix the issue if is a floating voltage?

livid osprey Jul 4, 2021, 4:53 PM

#

mystic gate sorry for not answering, had a rough week, and how can I fix the issue if is a f...

You can try a smaller resistor, or take it out altogether? I don't remember what the circuit was.

mystic gate Jul 4, 2021, 5:18 PM

#

Ok

mystic gate Jul 4, 2021, 5:22 PM

#

mystic gate Hi guys, maybe someone knows what happends here? in this video you can see my ES...

this one

#

well I don't know if is a floating voltage because the other day I remove the 10k resistor and still did the same.

livid osprey Jul 4, 2021, 5:27 PM

#

How did you wire up the button?

crimson radish Jul 4, 2021, 7:01 PM

#

cedar mountain It looks like you can pass in a `TwoWire` object in the constructor, if you're u...

..what exactly would that look like? Sorry, I'm new to coding 😬.

#

I tried this but it didnt work (probably an ovbious error, but oh well

cedar mountain Jul 4, 2021, 8:00 PM

#

crimson radish ..what exactly would that look like? Sorry, I'm new to coding 😬.

It would be likeAdafruit_BMP280 bmp(&Wire1);for example if you wanted to use the second I2C bus on a board. Not every pin is allowed to use I2C, so there are specific buses that are set up for it, called Wire, Wire1, etc.

pine bramble Jul 5, 2021, 8:13 AM

#

Hello experts
I'm using an Arduino Pro Mini and have leds attached to pins 10 and 11.
I want to use analogWrite to adjust their brightness.
Each led circuit has a low side mosfet controlled by the Arduino with a CCR and the LED in series.
However, when I use the lines:

analogWrite(10,50);
analogWrite(11,50);

.. The leds don't turn on.
It should be noted that these lines are added to an existing program which otherwise works.

Is it a problem that I want to analogwrite them both?
Does analogWrite need a library to work?
Does analogWrite require exclusive accesss to any timers or similar?

north stream Jul 5, 2021, 1:13 PM

#

You should be able to write analog values to two pins at once. No separate library is required, analogWrite() is built into the basic Arduino framework. It does, however, use PWM, which in turn depends on timers.

exotic rain Jul 5, 2021, 2:39 PM

#

woeful drift I guess I mean to ask are they for controlling a larger load or simply just for ...

I am mainly using them for looks. what i am doing is using it turn an led from red to blue. Then, repeat that 5 times. On the 6th time, it will turn a servo. Then i will have a seventh switch to reset evrything.

#

And by reset i mean turn the servo opposite direction and set all lights back to red.

woeful drift Jul 5, 2021, 4:05 PM

#

Ah I get it now. I suppose in that case since you're only using them to send a signal to the Arduino then just do what madbodger mentioned earlier:

madbodger — 07/03/2021
In general, hook the switch between a GPIO pin and ground, and configure the pin as INPUT_PULLUP. Then when the switch is open, it will read high (due to the pullup), and when the switch is closed, it will read low (due to the switch pulling the pin to ground).

#

You can just solder some smaller wire too to the switch's leads since you wouldn't need to carry the full rated current of the switch

#

I think (but somebody correct me if i'm wrong) that the wire that fits into breadboards and Arduino pins is 22 AWG

cedar mountain Jul 5, 2021, 4:12 PM

#

Yep, there's some range, but 22 is perfectly normal for hookup wire.

exotic rain Jul 5, 2021, 4:23 PM

#

Ok! Thanks guys!

rocky schooner Jul 6, 2021, 8:26 PM

#

I want to have a screen like this. What do I have to google to get a LC display like this?

#

I want to use it with the arduino and with the adafruit Feather M0. Pls ping me

deep steeple Jul 6, 2021, 8:36 PM

#

This may be a dumb question but could I wire 2 ir sensors to one port on an arduino or would it better to just code it in for multiple ports?

#

I have an area that would get better coverage with 2 sensors but not sure best way to handle multiple

cedar mountain Jul 6, 2021, 8:52 PM

#

rocky schooner I want to use it with the arduino and with the adafruit Feather M0. Pls ping me

That would generally be described as a monochrome graphic LCD.

cedar mountain Jul 6, 2021, 8:54 PM

#

deep steeple This may be a dumb question but could I wire 2 ir sensors to one port on an ardu...

What kind of sensor is it? If it's I2C or SPI, they can generally share a bus. If it's more of a direct connection, they usually wouldn't easily do so.

crisp folio Jul 6, 2021, 9:59 PM

#

rocky schooner I want to have a screen like this. What do I have to google to get a LC display ...

If you're looking to design your own EEVblog has this video and a series around LCDs https://www.youtube.com/watch?v=ZYvxgl-9tNM

YouTube

EEVblog

EEVblog #1055 - How to Design a Custom LCD

How to design a custom multiplexed LCD display.
Dave takes you through what is required to design your own custom LCD display and what consideration you need for manufacturing and choosing an LCD display driver.

Part 3 in the LCD Tutorial series.

Forum: http://www.eevblog.com/forum/blog/eevblog-1055-how-to-design-a-custom-lcd/

EEVblog Main We...

▶ Play video

deep steeple Jul 6, 2021, 10:03 PM

#

cedar mountain What kind of sensor is it? If it's I2C or SPI, they can generally share a bus. I...

It’s the direct to a data pin I figured that I’d just have to use two data pints so not a huge deal or changes in code at least

#

I’m planning on using one arduino nano as my slave to get ir signals then use the i2c bus to send data to a second one to control neopixel patterns and brightness since it doesn’t play nice trying to run on the same arduino

deep steeple Jul 7, 2021, 12:18 AM

#

ok maybe dumb question but why will this lower my brightness but not raise it?

  case 70:
          if(strip.getBrightness() <= 255){
             strip.setBrightness(strip.getBrightness() + 5);
             strip.show();
          }else
            Serial.println("MAX BRIGHT");
      case 21:
          if(strip.getBrightness() > 0){
            strip.setBrightness(strip.getBrightness() - 5);
            strip.show();
          }

#

it seems to always run the if brightness < than 255 but doesn't adjust the brightness

#

dimming is working perfectly as expected

odd fjord Jul 7, 2021, 12:21 AM

#

Are you sure case 70 is getting triggered?

deep steeple Jul 7, 2021, 12:21 AM

#

yes I added some serial prints to check and it is printing the brightness it just doesn't change

#

case 70:
          if(strip.getBrightness() <= 255){
             Serial.println(strip.getBrightness());
             int new_bright = strip.getBrightness() + 5;
             strip.setBrightness(new_bright);
             strip.show();
          }else
            Serial.println("MAX BRIGHT");
      case 21:
          if(strip.getBrightness() > 0){
            strip.setBrightness(strip.getBrightness() - 5);
            strip.show();
          }

#

this was with some extra prints and tweaks

odd fjord Jul 7, 2021, 12:24 AM

#

ah -- you need a break at the end of the case -- it is running from case 70 in to case 21 and undoing the increase.

deep steeple Jul 7, 2021, 12:24 AM

#

ah ok thank you always those dumb little things I forget

odd fjord Jul 7, 2021, 12:24 AM

#

extra eyes always help!

#

I often forget breaks as well. "C" is so literal....

deep steeple Jul 7, 2021, 12:26 AM

#

thanks appreciate it. I finally got a second arduino nano so using 2 as a slave/master setup to do some controlling of my neopixels with an IR remote

odd fjord Jul 7, 2021, 12:26 AM

#

Sounds like fun! Good luck with it.

deep steeple Jul 7, 2021, 12:26 AM

#

thanks I had a hacky version working before with both on one but this is much smoother and running nice so far with just one test strip

pine bramble Jul 7, 2021, 4:16 AM

#

I'm having trouble with getting my String to print. I'm using this library: https://github.com/adafruit/Adafruit_LED_Backpack

Heres my code: https://clbin.com/Mez0N

#

It just cuts off (uploading vid):

#

solemn cliff Jul 7, 2021, 4:33 AM

#

pine bramble It just cuts off (uploading vid):

you loop with a int8_t

#

ueoa will be something like - (747 + 3) * 7, which an int8 would never reach, but if there's an implicit conversion in x >= ueoa, you would expect the scroll to end within 128 pixels, which is 18 characters (with a 7 width), which takes us to the beginning of the first the

#

or something like that I suspect

pine bramble Jul 7, 2021, 12:55 PM

#

solemn cliff you loop with a `int8_t`

this was it! thank you!

#

What's the usual reason you would want to use int8_t ?

north stream Jul 7, 2021, 2:59 PM

#

Normally smaller variables like that are used to save space or increase speed (the original Arduino AVR is an 8-bit chip, so works well with 8-bit variables)

mortal ridge Jul 7, 2021, 6:29 PM

#

So I am using the Adafruit stepper shield V2. I have a stepper motor connected to it.

#

So has anyone used the adafruit V2. I have been trying to get my code to work. I have run the example code from the library, and it worked perfect. I built my code off of that, and I am wondering why it isnt working. The program runs and everything in the serial monitor works, but in the places where the motor should run....nothing happens.

#

https://pastebin.com/0P4FQC7X

Pastebin

#include #include // Create the motor sh - Pastebin.com

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

#

compare this to the StepperMotor example code

#

I have and have no idea why my code doesnt move the motor

north stream Jul 8, 2021, 12:26 AM

#

It looks like it blocks waiting for a digit, then parses the digit as a motor RPM, which would be a very slow RPM

pine bramble Jul 8, 2021, 8:57 PM

#

Error:

error: too many initializers for 'const char* [1]'

Code:

const char* wifis[][1] = {{"SSID","PASS"},{"SSID","PASS"}};

How do I make this char* 2D array? I've been trying for like 30 min xD

cedar mountain Jul 8, 2021, 9:01 PM

#

At the risk of stating the obvious, you've got a 1-element array specified, but the data has dimensions of 2.

pine bramble Jul 8, 2021, 9:23 PM

#

cedar mountain At the risk of stating the obvious, you've got a 1-element array specified, but ...

LMAO that was it! XD Thank you!!!

tight badge Jul 8, 2021, 11:29 PM

#

Hello All,

#

I am trying to get the aw9523 to work with an rgb led using the stemma off of a qt py with a light sensor also stemma. I have the code below. I had the light sensor working with an RGB led on the py itself but cant get the aw9523 to work.

#

#include <Arduino.h>
#include <hp_BH1750.h> // include the library
#include <Adafruit_AW9523.h>

hp_BH1750 BH1750; // create the sensor
Adafruit_AW9523 aw;

const int Red = 1;
const int Green = 3;
const int Blue = 2;
uint8_t Red1 = 0; // 0 thru 15

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
bool avail = BH1750.begin(BH1750_TO_GROUND);// init the sensor with address pin connetcted to ground
// result (bool) wil be be "false" if no sensor found

Serial1.begin(115200);
while (!Serial1) delay(1); // wait for serial port to open

Serial1.println("Adafruit AW9523 GPIO Expander test!");

if (! aw.begin(0x58)) {
Serial1.println("AW9523 not found? Check wiring!");
while (1) delay(10); // halt forever
}

Serial1.println("AW9523 found!");

aw.pinMode (Red1, OUTPUT);

pinMode (Red, OUTPUT);
pinMode (Green, OUTPUT);
pinMode (Blue, OUTPUT);

}

void loop() {
// put your main code here, to run repeatedly:
BH1750.start(); //starts a measurement
float lux=BH1750.getLux(); // waits until a conversion finished
Serial.println(lux);

if (lux > 20) analogWrite (Green, 256);

if (lux > 20) analogWrite (Red, 256);

if (lux > 20) analogWrite (Blue, 256);

if (lux > 20) aw.analogWrite (Red1, 256);

if (lux < 20) {

analogWrite (Red,0);
aw.analogWrite (Red1,0);

}
}

cedar mountain Jul 8, 2021, 11:54 PM

#

tight badge I am trying to get the aw9523 to work with an rgb led using the stemma off of a ...

Can you clarify what it's doing or not doing? Is it not even detected, or is it apparently working but just not lighting up the LED, or...?

tight badge Jul 8, 2021, 11:56 PM

#

I get nothing from it

cedar mountain Jul 8, 2021, 11:56 PM

#

It looks like the aw.analogWrite() call takes a uint8_t parameter, so the value needs to be 0-255.

tight badge Jul 8, 2021, 11:56 PM

#

I jumped AD0 and AD1 pins

#

I did try that

cedar mountain Jul 8, 2021, 11:57 PM

#

What do you mean by "I get nothing from it"?

tight badge Jul 8, 2021, 11:58 PM

#

No reaponce, is there a way to tell if the board is reaponfing?

cedar mountain Jul 8, 2021, 11:59 PM

#

It looks like you're using both Serial and Serial1. Perhaps you're only looking at the outpuf of one of them?

tight badge Jul 9, 2021, 12:00 AM

#

Yeah i did that thinking it might help

cedar mountain Jul 9, 2021, 12:01 AM

#

Address 0x58 would be with both AD pins left at the default.

tight badge Jul 9, 2021, 12:01 AM

#

Neither board is working after hooking up the aw9523

#

Ah I'll try that thanks

cedar mountain Jul 9, 2021, 12:02 AM

#

I'd advise simplifying the scenario and just trying to get the AW9523 detected at all first.

tight badge Jul 9, 2021, 12:13 AM

#

Will do, and i will change the address as well. Thanks

fluid nebula Jul 9, 2021, 2:24 AM

#

Wondering if this FRAM library by @split forge will likley work with other sizes of Fujitsu FRAM chips (like the MB85RC128APNF 128Kb) https://github.com/adafruit/Adafruit_FRAM_I2C

GitHub

adafruit/Adafruit_FRAM_I2C

Driver for Adafruit's I2C-Based FRAM Breakouts. Contribute to adafruit/Adafruit_FRAM_I2C development by creating an account on GitHub.

north stream Jul 9, 2021, 2:38 PM

#

It seems likely, especially with the same vendors, but a data sheet check would be wise.

tight badge Jul 9, 2021, 5:59 PM

#

@cedar mountain do you know what the appropriate new address would be with them both jumped?

exotic arch Jul 9, 2021, 6:05 PM

#

Hey guys, is there any good case around for the arduino mega that is sturdy but thin enough to provide access to all pins / HAT Support?

tight badge Jul 9, 2021, 6:32 PM

#

I am trying the code below with just the AW9523 attached to the py. #include <Arduino.h>
#include <Adafruit_AW9523.h>

Adafruit_AW9523 aw;

uint8_t Red1 = 10; // 0 thru 15

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
while (!Serial) delay(1); // wait for serial port to open

Serial.println("Adafruit AW9523 GPIO Expander test!");

if (! aw.begin(0x5B)) {
Serial.println("AW9523 not found? Check wiring!");
while (1) delay(10); // halt forever
}

Serial.println("AW9523 found!");
aw.pinMode(Red1, OUTPUT);
}

void loop() {
// put your main code here, to run repeatedly:

aw.analogWrite (Red1,0);
delay (1000) ;
aw.analogWrite (Red1, 255);

}

#

Still no response from the LED. The power light is on so I know the jst connection is good.

cedar mountain Jul 9, 2021, 7:42 PM

#

tight badge <@382380426628562955> do you know what the appropriate new address would be with...

From the guide: "A0 and A1 jumpers - These can be used to change the default I2C address from 0x58 to 0x59 (A0 shorted), 0x5A (A1 shorted) or 0x5B (both shorted!)"

north stream Jul 9, 2021, 9:26 PM

#

I usually try an I2C scanner first to see if things are hooked up properly and at which addresses they're responding.

waxen hawk Jul 9, 2021, 10:20 PM

#

Do anybody know the impact of using stl::vectors from c++ in arduino. I'm currently collecting multiple measurements and puting them into a vector. I'm using vectors cuz it can adjust for variable sizes but I'm not too sure about performance tho on arduino

rough torrent Jul 9, 2021, 10:41 PM

#

Hey I'm having a problem with calculating the length of a WAV file. I've ~~copied~~ adapted some code from Stack Overflow for Arduino (Adafruit PyGamer) and come up with this:

unsigned long getWavDuration(File f) {
  // https://stackoverflow.com/a/7842081/10291933
  return getWavDuration(getByteRate(f), f.size());
}

unsigned long getWavDuration(unsigned long byte_rate, unsigned long file_size) {
  Serial.print("Byte rate is "); Serial.print(byte_rate); Serial.println(" bytes/sec");
  Serial.print("File size is "); Serial.print(file_size); Serial.println(" bytes");
  return (unsigned long)((unsigned long)(file_size - 44) * 1000L) / byte_rate;
}

unsigned long getByteRate(File f) {
  unsigned long before_pos = f.position();
  unsigned long byte_rate = 0;
  byte buffer[4];
  f.seek(28);
  f.read(buffer, 4);
  f.seek(before_pos);
  byte_rate = (long)buffer[3] << 24;
  byte_rate += (long)buffer[2] << 16;
  byte_rate += (long)buffer[1] << 8;
  byte_rate += (long)buffer[0];
  return byte_rate;
}

unsigned long wav_duration = getWavDuration(file);
Serial.print("WAV is "); Serial.print(wav_duration); Serial.println(" ms long");

And the serial monitor shows:

18:36:16.460 -> Byte rate is 88200 bytes/sec
18:36:16.460 -> File size is 172103824 bytes
18:36:16.460 -> WAV is 3459 ms long

But my WAV file is ~32 minutes long which doesn't seem right. Calculating the result in Python shows the correct answer:

>>> file_size = 172103824
>>> byte_rate = 88200
>>> ((file_size - 44) * 1000) / byte_rate
1951290.022675737
>>> ms = ((file_size - 44) * 1000) / byte_rate
>>> ms / 1000 / 60
32.52150037792895
>>>

Any ideas?

#

Never mind figured it out: The equation to calculate the duration from the file size and byte rate returns a float so I just had to change everything to a float for it to work :D

cerulean knoll Jul 9, 2021, 11:18 PM

#

waxen hawk Do anybody know the impact of using stl::vectors from c++ in arduino. I'm curren...

I wouldn't worry about it too much

#

I use stl constructs all the time for little sketches

#

If you're doing something realtime, it's probably not a great practice. The vector resize might happen and throw off timing. Likewise the possibility of an OOM, heap fragmentation, etc, leads to the received wisdom of avoiding them for "serious" stuff

#

but Arduino already has plenty of built in stuff that can throw off real time, so there's a long list of other concerns if you start worrying a lot about stl containers

#

If you start running out of ROM/RAM though, you may need to dial it back a bit

wanton lance Jul 10, 2021, 1:12 PM

#

I'm trying to get the Adafruit 16-Channel PWM/Servo HAT & Bonnet for Raspberry Pi to work with arduino since i can't get the Adafruit PCA9685 in my country. I'm wondering if anyone can take a look at my circuit. The servos won't respond to the inputs

#

#

I’ve just ordered a few third party PAC9685, wonder if that will solve the problem

#

building someones design, also using their code. So I assume it's something wrong with my circuit since many people build it already

north stream Jul 10, 2021, 1:36 PM

#

Does the device show up on an I2C scan? Does the driver attach?

elder hare Jul 10, 2021, 2:14 PM

#

is it at all possible to change "numleds" using WS2812B LED and fastLED on the fly (while the program is running)? :S

north stream Jul 10, 2021, 2:26 PM

#

I would guess it's possible but could be awkward/difficult/problematic, and you can only go down, not up.

#

There doesn't seem to be a lot of reasons to do so, other than maybe increasing update speed.

wanton lance Jul 10, 2021, 2:34 PM

#

north stream Does the device show up on an I2C scan? Does the driver attach?

No, not showing up

north stream Jul 10, 2021, 2:35 PM

#

That may well point to a wiring problem

wanton lance Jul 10, 2021, 2:38 PM

#

I'm not sure where I'll plug them then ;(

elder hare Jul 10, 2021, 2:42 PM

#

@north stream i want to be able to just connect a strip and then connect to the ESP32 via socket where in the software i can input how many LED's it has and then send that over to the ESP32 (and then maybe restart ESP32? if needed!)

currently what i do is this

// i spesify 300 LED's on each port
LEDController<15, 300, Config[DEVICE].NUMLED[0]> Strip1{ledsettings[0]};

// then i tell fastled show() how many there is
Strip1.controller->show(Strip1._Leds.data(), Strip1._NumLeds, 255);

but numleds are const here and the Config is static constexpr

north stream Jul 10, 2021, 2:44 PM

#

The I2C pins to use for various Arduinos are listed here: https://www.arduino.cc/en/reference/wire

Arduino - Wire

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

wanton lance Jul 10, 2021, 2:52 PM

#

Yeah, I used A4 and A5 when scanning I2C

#

seems like its the problem with the servo hat

#

other I2C seem to work

north stream Jul 10, 2021, 3:03 PM

#

Ah, that's useful info. I wonder if the servo hat has multiple power supplies (one for the logic and one for the servos) or something like that.

wanton lance Jul 10, 2021, 3:04 PM

#

yeah. one for servo and vcc for the chip

north stream Jul 10, 2021, 3:05 PM

#

Makes sense. If the chip supply (which presumably also powers the I2C pull-up resistors) is connected, it should answer up if it's working.

wanton lance Jul 10, 2021, 3:06 PM

#

I thought its powering the chip via the pins i've plugged in on the right

#

let me try powering it from the GPIO pins

north stream Jul 10, 2021, 3:08 PM

#

Normally you'd power it from the 5V pin, I'd be leery of using GPIO pins as power

wanton lance Jul 10, 2021, 3:09 PM

#

Ah, i mean by the 5v pin matching on the pi gpio pins

#

aah yeah

#

found the problem

#

let me solder some header pins on it

#

wait nvm its from my last scan

#

didbn't solve the problem

north stream Jul 10, 2021, 3:18 PM

#

I wonder if it's looking for 3.3V if it's a Pi peripheral

wanton lance Jul 10, 2021, 3:21 PM

#

I thknk it might be it!

#

thanks! address is showing up now

#

why does Pi peripheral looks for 3.3v? is this always the case?

north stream Jul 10, 2021, 3:30 PM

#

All the Pi GPIOs are 3.3V, so the Pi peripherals expect to run at the same voltage.

wanton lance Jul 10, 2021, 3:30 PM

#

I see and the 5v one is just to power things that requires 5v?

pine bramble Jul 10, 2021, 3:32 PM

#

I use the two corner 5V pins on the Pi to power external boards (small MCU targets).

#

You can also backfeed this pin with 5V to power the Pi, but you bypass the PTC (like a fuse) if you do so.

#

It is recommended to only power the Pi via its USB socket labeled for power (not the regular USB-A jacks).

#

It's also a good practice to add an inline shottky diode to the 5V pin in the corner of the Pi, if powering external circuits that may (at times) have their own 5V supply. That way you don't accidentally backfeed the Pi's 5V pin with your other board.

#

(Might overtax the USB port that (alternately) powers the other board (say, when updating its firmware).

#

One time I switched off the Pi and it didn't go off .. the alternate route maintained power to it. Oops.

wanton lance Jul 10, 2021, 3:46 PM

#

ah i see

#

Thanks for your help madbodger, its now working

brave maple Jul 11, 2021, 3:02 AM

#

currently I'm a bit stumped as to how to get two adafruit 8x8 neomatrixes to work with the arduino uno; I have them set up properly, but lack the know how to change the example code (adafruit's neomatrix test) to recognize the second panel

#

``// Adafruit_NeoMatrix example for single NeoPixel Shield.
// Scrolls 'Howdy' across the matrix in a portrait (vertical) orientation.

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
#define PSTR // Make Arduino Due happy
#endif

#define PIN 6

// MATRIX DECLARATION:
// Parameter 1 = width of NeoPixel matrix
// Parameter 2 = height of matrix
// Parameter 3 = pin number (most are valid)
// Parameter 4 = matrix layout flags, add together as needed:
// NEO_MATRIX_TOP, NEO_MATRIX_BOTTOM, NEO_MATRIX_LEFT, NEO_MATRIX_RIGHT:
// Position of the FIRST LED in the matrix; pick two, e.g.
// NEO_MATRIX_TOP + NEO_MATRIX_LEFT for the top-left corner.
// NEO_MATRIX_ROWS, NEO_MATRIX_COLUMNS: LEDs are arranged in horizontal
// rows or in vertical columns, respectively; pick one or the other.
// NEO_MATRIX_PROGRESSIVE, NEO_MATRIX_ZIGZAG: all rows/columns proceed
// in the same order, or alternate lines reverse direction; pick one.
// See example below for these values in action.
// Parameter 5 = pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_GRBW Pixels are wired for GRBW bitstream (RGB+W NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
``

#

``
// Example for NeoPixel Shield. In this application we'd like to use it
// as a 5x8 tall matrix, with the USB port positioned at the top of the
// Arduino. When held that way, the first pixel is at the top right, and
// lines are arranged in columns, progressive order. The shield uses
// 800 KHz (v2) pixels that expect GRB color data.
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, PIN,
NEO_MATRIX_TOP + NEO_MATRIX_RIGHT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
NEO_GRB + NEO_KHZ800);

const uint16_t colors[] = {
matrix.Color(150, 50, 15), matrix.Color(25, 150, 25), matrix.Color(15, 50, 50) };

void setup() {
matrix.begin();
matrix.setTextWrap(false);
matrix.setBrightness(20);
matrix.setTextColor(colors[0]);
}

int x = matrix.width();
int pass = 0;

void loop() {
matrix.fillScreen(0);
matrix.setCursor(x, 0);
matrix.print(F("Oh_Lawd_He_Comin"));
if(--x < -86) {
x = matrix.width();
if(++pass >= 3) pass = 0;
matrix.setTextColor(colors[pass]);
}
matrix.show();
delay(150);
}``

#

I know it has to be this area

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, PIN, NEO_MATRIX_TOP + NEO_MATRIX_RIGHT + NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE, NEO_GRB + NEO_KHZ800);

but I haven't had much luck finding visual tutorials that explain it

topaz compass Jul 11, 2021, 3:16 AM

#

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, 7,
NEO_MATRIX_TOP + NEO_MATRIX_RIGHT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
NEO_GRB + NEO_KHZ800);

Adafruit_NeoMatrix matrix2 = Adafruit_NeoMatrix(8, 8, 8,
NEO_MATRIX_TOP + NEO_MATRIX_RIGHT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
NEO_GRB + NEO_KHZ800);

#

Update the pin numbers and setup appropriately... Should be sufficient

#

This section of the learn guide may be helpful: https://learn.adafruit.com/adafruit-neopixel-uberguide/neomatrix-library#tiled-matrices-2894566-16

Adafruit Learning System

Adafruit NeoPixel Überguide

Everything you always wanted to know about Adafruit NeoPixels but were afraid to ask

brave maple Jul 11, 2021, 3:33 AM

#

topaz compass This section of the learn guide may be helpful: https://learn.adafruit.com/adafr...

It's a bit helpful, although it doesn't elaborate if this section of code should be written "as is" or if it needs to be modified since there's not an example of it being used:

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix( matrixWidth, matrixHeight, tilesX, tilesY, pin, matrixType, ledType);

#

currently, I have the example code set up like so, which still runs the first matrix but not the second which is connected to the first:

``// Adafruit_NeoMatrix example for single NeoPixel Shield.
// Scrolls 'Howdy' across the matrix in a portrait (vertical) orientation.

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
#define PSTR // Make Arduino Due happy
#endif

#define PIN 7

// MATRIX DECLARATION:
// Parameter 1 = width of NeoPixel matrix
// Parameter 2 = height of matrix
// Parameter 3 = pin number (most are valid)
// Parameter 4 = matrix layout flags, add together as needed:
// NEO_MATRIX_TOP, NEO_MATRIX_BOTTOM, NEO_MATRIX_LEFT, NEO_MATRIX_RIGHT:
// Position of the FIRST LED in the matrix; pick two, e.g.
// NEO_MATRIX_TOP + NEO_MATRIX_LEFT for the top-left corner.
// NEO_MATRIX_ROWS, NEO_MATRIX_COLUMNS: LEDs are arranged in horizontal
// rows or in vertical columns, respectively; pick one or the other.
// NEO_MATRIX_PROGRESSIVE, NEO_MATRIX_ZIGZAG: all rows/columns proceed
// in the same order, or alternate lines reverse direction; pick one.
// See example below for these values in action.
// Parameter 5 = pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_GRBW Pixels are wired for GRBW bitstream (RGB+W NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)``

#

``// Example for NeoPixel Shield. In this application we'd like to use it
// as a 5x8 tall matrix, with the USB port positioned at the top of the
// Arduino. When held that way, the first pixel is at the top right, and
// lines are arranged in columns, progressive order. The shield uses
// 800 KHz (v2) pixels that expect GRB color data.
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, 7,
NEO_MATRIX_TOP + NEO_MATRIX_LEFT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
NEO_GRB + NEO_KHZ800);

Adafruit_NeoMatrix matrix2 = Adafruit_NeoMatrix(8, 8, PIN,
NEO_MATRIX_TOP + NEO_MATRIX_RIGHT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
NEO_GRB + NEO_KHZ800);

const uint16_t colors[] = {
matrix.Color(150, 50, 15), matrix.Color(25, 100, 25), matrix.Color(15, 50, 50) };

void setup() {
matrix.begin();
matrix.setTextWrap(false);
matrix.setBrightness(20);
matrix.setTextColor(colors[0]);
}

int x = matrix.width();
int pass = 0;

void loop() {
matrix.fillScreen(0);
matrix.setCursor(x, 0);
matrix.print(F("HONK HONK"));
if(--x < -56) {
x = matrix.width();
if(++pass >= 3) pass = 0;
matrix.setTextColor(colors[pass]);
}
matrix.show();
delay(50);
}``

I changed the second to say Adafruit_NeoMatrix matrix2 = Adafruit_NeoMatrix(8, 8, PIN, after (8,8,8) failed to do the trick

topaz compass Jul 11, 2021, 3:40 AM

#

Yeah, after reading the tutorial, my example is not right. You don't need the matrix2 declaration at all. You just have to get the original declaration right.

brave maple Jul 11, 2021, 3:43 AM

#

topaz compass Yeah, after reading the tutorial, my example is not right. You don't need the ma...

aah okay, that makes sense 👍
I was wondering why it wasn't working at first, and then I began tinkering with the argument: Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix( matrixWidth, matrixHeight, tilesX, tilesY, pin, matrixType, ledType); and with constant verification it seems like it may begin to work but I don't know what to fill "tilesX, tilesY, matrixType, and ledType" with

topaz compass Jul 11, 2021, 3:49 AM

#

And the tutorial is unfortunately not of much help with that, as far as I can see...

brave maple Jul 11, 2021, 3:51 AM

#

topaz compass And the tutorial is unfortunately not of much help with that, as far as I can se...

sadly yeah 😔 however I was able to do some deductive reasoning/educated guessing and found out this worked:

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix( 8, 8, NEO_MATRIX_TOP, NEO_MATRIX_LEFT, 7, NEO_MATRIX_PROGRESSIVE, NEO_GRB);

#

The board now recognizes both but won't print "HONK HONK", board currently looks like this:

#

(sorry folks for the blinding lights)

#

least it now lights up a single LED on the second matrix

#

welp, now im trying to get it to print and animate "HONK HONK" again 🤔

brave maple Jul 11, 2021, 4:37 AM

#

does anyone know if this section needs adjustments to get it to work with the above code?

  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(20);
  matrix.setTextColor(colors[0]);
}

int x    = matrix.width();
int pass = 0;

void loop() {
  matrix.fillScreen(0);
  matrix.setCursor(x, 0);
  matrix.print(F("HONK HONK"));
  if(--x < -56) {
    x = matrix.width();
    if(++pass >= 3) pass = 0;
    matrix.setTextColor(colors[pass]);
  }
  matrix.show();
  delay(50);
}``

or is this section written incorrectly for 2 8x8 NeoMatrix matrices?

``Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(
  8, 8, NEO_MATRIX_TOP, NEO_MATRIX_LEFT, 6, NEO_MATRIX_PROGRESSIVE, NEO_GRB + NEO_KHZ800);```

#

something feels off with the latter code but can't place my thumb on what could be incorrect, but it definitely seems like the former code requires some adjustments possibly to support 2 matrices?

cerulean knoll Jul 11, 2021, 4:47 AM

#

I think you need a third backtick for those to show up as code blocks

brave maple Jul 11, 2021, 4:50 AM

#

cerulean knoll I think you need a third backtick for those to show up as code blocks

possibly 🤔 I'll be revisiting it after I buy some pin headers because it looks like part of the issue is a hardware problem

cerulean knoll Jul 11, 2021, 4:51 AM

#

I mean simply to have discord format the code

#

You need ```

brave maple Jul 11, 2021, 4:51 AM

#

OH

cerulean knoll Jul 11, 2021, 4:51 AM

#

Not ``

brave maple Jul 11, 2021, 4:51 AM

#

okay i'll go fix that!

#

fixed!

#

but anyhow, after adjusting the actual matrices themselves with just slight movement, it could just be a hardware problem because the moment I just barely moved them it began trying its best to run the code

#

the matrices are connected to the wires via painter's tape so I need to get what I think are called pin headers?

cerulean knoll Jul 11, 2021, 4:54 AM

#

hm yeah I'm trying to read back a bit and figure out exactly what's going on here, but painter's tape doesn't sound like a reliable solution

#

you can solder wires on, or you can solder pin headers on and stick wires into those

#

if you use pin headers, you can use jumper cables which might be nice

#

Okay so you have 2 neomatrixes (neomatrices??) and just want to run the test code on both of them at the same time?

#

at least to start?

#

I see that you're declaring a second matrix, but it looks like your setup and loop functions are only ever doing anything to the first matrix

#

@brave maple Here's a very simple copy/paste job as an example

void setup() {
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(20);
  matrix.setTextColor(colors[0]);
  matrix2.begin();
  matrix2.setTextWrap(false);
  matrix2.setBrightness(20);
  matrix2.setTextColor(colors[0]);
}

int x    = matrix.width();
int pass = 0;

void loop() {
  matrix.fillScreen(0);
  matrix.setCursor(x, 0);
  matrix.print(F("HONK HONK"));

  matrix2.fillScreen(0);
  matrix2.setCursor(x, 0);
  matrix2.print(F("HONK HONK"));

  if(--x < -56) {
    x = matrix.width();
    if(++pass >= 3) pass = 0;
    matrix.setTextColor(colors[pass]);
matrix2.setTextColor(colors[pass]);
  }
  matrix.show();
  matrix2.show();
  delay(50);
}

#

A much, much better way to do it would be to separate bits out into functions that operate on a Adafruit_NeoMatrix*

#

This example will also only work if you're printing the same thing (or at least, something the same size) to both displays

cerulean knoll Jul 11, 2021, 5:23 AM

#

#define NUM_COLORS 3

void initMatrix(Adafruit_NeoMatrix &m) {
  m.begin()
  m.setTextWrap(false)
  m.setTextColor(colors[0]);
}

struct PrintState {
  std::string msg;
  int mark;
  int minMark;
  int passes;
  PrintState(
      std::string msg_, int mark_, int minMark_) : 
          msg(msg_),
          mark(mark_),
          minMark(minMark_),
          passes(0)
  {}
};
PrintState ps1("HONK HONK", matrix1.width(), -56);
PrintState ps2("BLEEP BLEEP", matrix2.width(), -56);

void fancyPrintMatrix(Adafruit_NeoMatrix &m, PrintState& ps) {
  m.fillScreen(0);
  m.setCursor(ps.mark, 0);
  m.print(ps.msg);
  ps.mark = ps.mark - 1;
  if(ps.mark < ps.minMark) {
    ps.mark = m.width();
    ps.passes = ps.passes + 1;
  }
  m.setTextColor(colors[ps.passes % NUM_COLORS]);
  m.show()
}

void setup() {
  initMatrix(matrix1);
  initMatrix(matrix2);
}

void loop() {
  fancyPrintMatrix(matrix1, ps1);
  fancyPrintMatrix(matrix2, ps2);
  delay(50);
}

#

That probably won't compile on the first try tbh

#

I don't have the arduino IDE on hand to test it out myself

brave maple Jul 11, 2021, 5:45 AM

#

@cerulean knoll that's fine and this information definitely helps! And yeah, painter's tape isn't that great for connecting matrices, but I didn't have anything else to keep them in place so hoping to fix that soon 👍

cerulean knoll Jul 11, 2021, 5:48 AM

#

been there 🙂

pine bramble Jul 11, 2021, 2:36 PM

#

Dudes
I have a controller which has an USB cable which has a Data+ and a Data- line
I think that the controller sends data over the non-return-to-zero encoding and i have an ESP32
How can i decode the Data sent by the controller over the Data lines using the ESP?
I have absolutely no clue where to start

rough torrent Jul 11, 2021, 2:41 PM

#

ben eater posted several videos on how USB works - it's actually really complicated 😦
not maker friendly

#

https://www.youtube.com/watch?v=wdgULBpRoXk

YouTube

Ben Eater

How does a USB keyboard work?

The USB 2.0 spec: https://eater.net/downloads/usb_20.pdf

Support these videos on Patreon: https://www.patreon.com/beneater or https://eater.net/support for other ways to support.

0:00 Intro
0:50 USB electrical interface
4:43 How USB encodes bits and packets
23:41 USB packet contents
29:26 USB vs. PS/2

Social media:
Webs...

▶ Play video

#

https://www.youtube.com/watch?v=N0O5Uwc3C0o

YouTube

Ben Eater

How does USB device discovery work?

What happens when you first plug a USB device in? There's a whole bunch of negotiation where the computer discovers what a USB device is capable of. In this video I capture the conversation and walk through what's going on.

Support these videos on Patreon: https://www.patreon.com/beneater or https://eater.net/support for other ways to support.
...

▶ Play video

pine bramble Jul 11, 2021, 2:52 PM

#

Yes i have seen them but the controller is really primitive, it doesnt use the USB protocol i think
I just have to know how i can make the ESP32 read the zeroes and ones

#

Can i just plug the data lines into one pin of the ESP and let the ESP then analoge-read the pin?

#

But how do i know when to read and when one bit ends and when another one starts? NRTZ is not self-clocking

cedar mountain Jul 11, 2021, 2:55 PM

#

It would be very unusual for a USB device to not use the full protocol and just do some custom transmission over the same pins, but if that's the case you'd need to reverse-engineer what it's doing.

pine bramble Jul 11, 2021, 2:56 PM

#

Yes thats what im trying to do, but to be able to do that i have to know how to read the data that the controller sends

cedar mountain Jul 11, 2021, 2:58 PM

#

An oscilloscope would be the first step, to figure out what the signals look like and what the voltage levels are, etc. However, to be honest this sounds like a waste of time, since it's probably standard USB.

pine bramble Jul 11, 2021, 2:59 PM

#

If it follows the standard usb protocol, shouldnt my compurer detect a new device when i plug the controller in?

#

The controller is specifically made for a portable dvd player

cedar mountain Jul 11, 2021, 3:01 PM

#

The computer should detect something, but it might not have a driver for the specific device. But yes, it should show up somewhere. I'd generally expect it to be a HID device, knowing nothing else about it.

pine bramble Jul 11, 2021, 3:02 PM

#

I never found any sign of the computer detecting anything

#

Shouldnt the computer detect that something has been plugged in even if it doesnt have the correct driver? Because it didnt detect anything at all

#

The controller is from something like this https://youtu.be/p3JzkQzl6qc

cedar mountain Jul 11, 2021, 3:03 PM

#

Yes, I'd expect something to be detected if it conforms to the USB standard.

#

If it's something else, then yeah, oscilloscope time. Ideally you'd tap into the cable and probe it while it's being used by the DVD player.

pine bramble Jul 11, 2021, 3:11 PM

#

Can an ESP32 read data fast enough in order to be able to act as an oscilloscope when examining USBs?

cedar mountain Jul 11, 2021, 3:16 PM

#

No, I don't think so.

#

At least through the ADC.

slender idol Jul 11, 2021, 3:29 PM

#

Hi, I am using a micro sd card reader with an UNO but i want to change it for a Seeeduino Xiao that is a board with only 10 digital and analog pins instead of 13. the problem is that the code uses the 10, 11, 12, 13 pins in the UNO and in the code it doesnt specify the pins so that i can change them. What can i do? Here is the code: #include <SD.h>//https://www.arduino.cc/en/reference/SD
#include <SPI.h>//https://www.arduino.cc/en/Reference/SPI

#define SD_ChipSelectPin 4

File root;

void setup() {
//Init Serial USB
Serial.begin(9600);
Serial.println(F("Initialize System"));
//Init sd shield
if (!SD.begin(SD_ChipSelectPin)) {
Serial.println(F("SD fail"));
return;
}
printFilenames();
}

void loop() {

}

void printFilenames(void ) { /* function printFilenames */
root = SD.open("Text.txt");
while (true) {
File entry = root.openNextFile();
if (! entry) {
break;// no more files
}
Serial.println(entry.name());
entry.close();
}
}

Arduino - SD

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

Arduino - SPI

Open-source electronic prototyping platform enabling users to create interactive electronic objects.

leaden walrus Jul 11, 2021, 3:30 PM

#

https://support.discord.com/hc/en-us/articles/210298617-Markdown-Text-101-Chat-Formatting-Bold-Italic-Underline-

#

it'll use whatever the hardware spi pins are on the xiao

#

then you just need to specify an available gpio pin (other than the hardware spi pins) to use for chip select

#

so should only need to change this line:

#define SD_ChipSelectPin 4

#

or just use 4 for CS if available

slender idol Jul 11, 2021, 3:47 PM

#

Thanks!

north stream Jul 11, 2021, 5:39 PM

#

@slender idol There's a diagram showing how to connect a micro SD reader to the Xiao on this page (scroll down about halfway): https://wiki.seeedstudio.com/Seeeduino-XIAO-by-Nanase/

Seeeduino XIAO by Nanase - Seeed Wiki

Seeed Product Document

slender idol Jul 11, 2021, 6:14 PM

#

hi, i need some help. in my code i wrote this line #define CS_PIN D8 . it says D8 was not declared in this scope. What should i do?

leaden walrus Jul 11, 2021, 6:40 PM

#

you probably just want #define CS_PIN 8

#

but you could #def D8 if you wanted

wraith current Jul 11, 2021, 11:23 PM

#

@slender idolfind the pinout for your board and use the pin number instead of D8. it might be just 8 or it might be something else.

deep steeple Jul 12, 2021, 12:08 AM

#

is there any way to connect an esp32 to a network that requires both a username and password? My universities network has both to connect and wondering if it's possible or if my probject just won't work

wraith current Jul 12, 2021, 12:57 AM

#

@deep steepleyou mean it has a captive portal and requires you to login on a webpage ?

deep steeple Jul 12, 2021, 1:00 AM

#

wraith current <@!480055359462178826>you mean it has a captive portal and requires you to login...

It's slightly different from the portal it just asks for a username and password rather than just a password

#

Just uses the built in ui both on phone and a windows computer

wraith current Jul 12, 2021, 1:03 AM

#

i've never seen anything like that before. What's it look like when connecting on a computer ?

#

@deep steeple i think this is what you're looking for: https://github.com/JeroenBeemster/ESP32-WPA2-enterprise/blob/master/ESP32_WPA2enterprise.ino

GitHub

JeroenBeemster/ESP32-WPA2-enterprise

ESP32 WPA2 Enterprise example simplified for Arduino - JeroenBeemster/ESP32-WPA2-enterprise

deep steeple Jul 12, 2021, 1:24 AM

#

wraith current i've never seen anything like that before. What's it look like when connecting ...

Same thing on windows it just also asks for a username too where it asked for a password

#

I’ll check that out though thanks

deep steeple Jul 12, 2021, 2:08 AM

#

wraith current <@!480055359462178826> i think this is what you're looking for: https://github.c...

awesome that ended up working thanks! now I just need to look into a way to use that network connection with the blynk library

#

or I may go the route of a web GUI instead

coarse breach Jul 12, 2021, 5:36 AM

#

Hey, my USB to UART dongle is damaged and i'm trying to substitute it with an Arduino nano, will connecting my tx and Rx pins to the respective ports on the Arduino Nano be sufficient or will I have to set something up in the arduino?

wraith current Jul 12, 2021, 9:55 AM

#

can't seem to figure out this mqtt callback command. the only difference between this and the example is that I'm inside of a custom class called Data_mqtt

void Data_mqtt::setup(WiFiClient *wclient) {
    spl("in mqtt setup");
    int port = m_config->api_server_port();
    String server = m_config->api_server();
    if (port <= 0 ) port = 1883; // user the default if we get 0 or negative back
    Serial.printf("mqtt server set to %s on port %d\n",server.c_str(), port);
    String clientId = m_config->m_device_name;
    spl2("mqtt client id : ",clientId);
    m_client = new Adafruit_MQTT_Client(&m_wifi,server.c_str(), port, m_config->gets("api_username").c_str(), m_config->gets("api_password").c_str());
    m_data_sub = new Adafruit_MQTT_Subscribe(m_client, m_config->api_data_path().c_str());
    m_command_sub = new Adafruit_MQTT_Subscribe(m_client, m_config->api_data_path().c_str());

    m_data_sub->setCallback(data_callback);            //Data_mqtt::command_callback);

    m_command_sub->setCallback(command_callback);

    // Setup MQTT subscription for onoff & slider feed.
    m_client->subscribe(m_data_sub);
      m_client->subscribe(m_command_sub);

#

Screen_Shot_2021-07-11_at_11_Sun_11.55.58_PM.png

lone ferry Jul 12, 2021, 10:07 AM

#

Your data_callback does not have the signature void (char *, uint16_t)

#

That's what the error says.

wraith current Jul 12, 2021, 10:09 AM

#

void Data_mqtt::command_callback(char* payload, uint16_t length) {

lone ferry Jul 12, 2021, 10:10 AM

#

That indeed does not have that signature. You may wonder why, but the trick is that you're using a method that is inside a class, which adds a hidden argument that points to the class instance.

wraith current Jul 12, 2021, 10:10 AM

#

ohhhhh. how to workaround ?

lone ferry Jul 12, 2021, 10:12 AM

#

I don't know in this case. Traditionally such callback functions allow you to pass in a "userData" object, which would be the pointer to your class. But this one does not seem to have that. I'm also not sure it can handle a closure (or even if Arduino C++ can handle closures at all).

wraith current Jul 12, 2021, 10:13 AM

#

darn it. I'm sure there is a way to put a combination of void and * that will make it work 😉

lone ferry Jul 12, 2021, 10:15 AM

#

Yes, move the function out of your class.

wraith current Jul 12, 2021, 10:17 AM

#

ugh. that won't work. I guess I'll just have to not use callbacks for this. thanks for looking.

cerulean knoll Jul 12, 2021, 11:29 AM

#

there are some solutions to this

#

oh wait, I think the ones I'm thinking of may require the callback to accept a std::function

#

@lone ferry I am fairly confident I've used closures in arduino c++ before, but I think the STL support in general can vary a bit between boards

exotic arch Jul 12, 2021, 3:43 PM

#

Hey guys, I have three questions on how much current the Arduino Uno board can deliver:

(1) What is the maximum current of the 3V3 line?
(2) What is the maximum current of the 5V line?
(3) Are they two lines independent or do they have a combined current limit?

livid osprey Jul 12, 2021, 3:51 PM

#

exotic arch Hey guys, I have three questions on how much current the Arduino Uno board can d...

(1) The 3V3 line has a limit of 150mA.
(2) The 5V line is limited by its source; USB would be 500mA, while the barrel jack can go upwards of 1A. However, the barrel jack feeds DC voltage into a voltage regulator with a thermal shutdown, so your actual limit would depend on the DC voltage input.
(3) The 3V3 power comes from a voltage regulator powered by the 5V, so your total 3V3 output would contribute to the 5V power limit. The two do not combine additively, but the 5V load from 3V3 can be calculated by its power draw at the regulator.

exotic arch Jul 12, 2021, 3:51 PM

#

awesome, thanks 😄

lucid minnow Jul 12, 2021, 11:14 PM

#

Hello, I am using the Adafruit LSM6DSOX board with the Adafruit LSM6DSOX library on a Teensy 3.2 over I2C. To ensure that I have a fixed sampling rate, I am storing readings from the sensor [as well as 2 other analog pins] into a buffer in a timer based interrupt service routine. I've set the data rate of the accelerometer to 6.6kHz [I've also tried 1.66k, 3.33k], but I am unable to get an actual data rate over ~380Hz [timer interrupts at 2700us] . The problem is arising out of the "getEvent(&accel, &gyro, &temp)" function in the library. When that function is commented out, the analog pins at least can be sampled at whatever rate I set [I only want 1kHz, nothing fancy].

slender idol Jul 12, 2021, 11:28 PM

#

Hi, I am using an seeeduino XIAO to save data from a bmp280 to a microsd card module. I dont know why but the result in the txt file is this:
iempo(ms)=37870, sensor1=28.69, sensor2=101013.59, sensor3=25.96
Tiempo(ms)=38002, sensor1=28.68, sensor2=101013.19, sensor3=25.99
Tiempo(ms)=38136, sensor1=28.68, sensor2=101013.19, sensor3=25.99
Tiempo(ms)=38270, sensor1=28.68, sensor2=10013/ñ9ÿüsÿîÿò?ý3ÿ.?¹
ŠTiempüó)=38407, sensor1=28.68, sensor2=101013.19, sensor3=25.99
Tiempo(ms)=38740, sensor1=28.67, sensor2=101013.06, sensor3=26.00
TTiempo(ms)=39?1?ÿ ÿïÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
it starts good but then it has all those strange ys everywhere... What should i do?

crisp folio Jul 12, 2021, 11:36 PM

#

Think somethings messing up your writes ÿ is 0x00FF so seems like some bits are stuck

brazen falcon Jul 13, 2021, 6:23 AM

#

That looks like an intermittent connection or a bad card.

storm matrix Jul 13, 2021, 6:51 AM

#

Hey guys i need help connecting the Arduino Nano RP2040 Connect to AWS via MQTT - can someone help?
The issue is that WiFININA connects just fine, but as soon as I want to connect to AWS IoT via MQTT it doesn't connect

deep steeple Jul 13, 2021, 9:37 PM

#

When I run my arduino nano off the USB port it works great but when I run this code off a 9 volt battery it doesn't register the switch changes

#include <Adafruit_NeoPixel.h>
Adafruit_NeoPixel strip = Adafruit_NeoPixel(5, 6, NEO_GRB + NEO_KHZ800);
bool pre_color = true;

void setup() {
    strip.begin();
    strip.setBrightness(120);
    strip.show();
    pinMode(8, INPUT);
    Serial.begin(9600);
    Serial.println("Serial Begin");
}
  void loop() {
    if(digitalRead(8)!= pre_color){
      if (digitalRead(8) == LOW) {
          Serial.println("Left");
          strip.fill(strip.Color(253,50,0),0,5);
          pre_color = false;
      }else if (digitalRead(8) == HIGH) {
          Serial.println("Right");
          strip.fill(strip.Color(0,120,255),0,5);
          pre_color = true;
      }
      strip.show();
    }
}

#

I presume the battery just isn't enough for what I'm doing then and I'll need to upgrade to something with more power

north stream Jul 13, 2021, 11:34 PM

#

It could be that it's getting stuck because the serial port isn't connected

deep steeple Jul 13, 2021, 11:39 PM

#

north stream It could be that it's getting stuck because the serial port isn't connected

Hmm that’s true maybe but it was working intermittently sometimes switching when I first plug in the battery

north stream Jul 13, 2021, 11:40 PM

#

As a test, you could try powering the NeoPixels separately

deep steeple Jul 13, 2021, 11:41 PM

#

I can try that but will be tricky it was working at first with the battery so I finished assembling the project and easy access was only usb and power port

north stream Jul 13, 2021, 11:42 PM

#

It may be more trouble than it's worth, it was just a thought to try to narrow down what is happening

deep steeple Jul 13, 2021, 11:42 PM

#

Yeah no it makes sense to try it seems logical

#

I’ve had some projects with serial print that ran fine when n out connected but maybe this one is an exception (I guess I could also try reuploading without it as a step)

north stream Jul 14, 2021, 12:02 AM

#

That sounds like a quicker thing to test

old heart Jul 14, 2021, 10:14 PM

#

Is this not the right syntax for looping through an array?

  for(byte i = 0; i < sizeof(colorPercentages)/sizeof(colorPercentages[0]); i++) {
    Serial.println(colorPercentages[i]);
  }

It skips the last element of colorPercentages

#

If i change it to (adding a + 1 to the end)

for(byte i = 0; i < sizeof(colorPercentages)/sizeof(colorPercentages[0]) + 1; i++)

it works but then I get the warning: iteration 4 invokes undefined behavior [-Waggressive-loop-optimizations]

cedar mountain Jul 14, 2021, 10:46 PM

#

old heart If i change it to (adding a `+ 1` to the end) ```arduino for(byte i = 0; i < siz...

The code looks reasonable. Are you sure that colorPercentages is declared with the correct number of elements?

old heart Jul 14, 2021, 10:51 PM

#

cedar mountain The code looks reasonable. Are you sure that `colorPercentages` is declared with...

Ah, you are correct. It's been awhile since I've used C/Arduino. Thank you!

quartz furnace Jul 15, 2021, 1:03 AM

#

Question for the show: The TCA4307 Hot-Swap I2C Buffer js it possible with Ardunio code to Query if the TCA4307 is in fact attached in the I2C wiring ? Reason would be to code to “check wiring” before use error message

#

Oops wrong place

tight badge Jul 15, 2021, 1:41 AM

#

I have made my code as simple as I think it can be. I get the message in the serial monitor that tells me "AW9523 found!" I have a 10mm RGB common anode connected with the red lead to pin 10. I get no response from the LED. Does anyone have any suggestions?

#

#include <Adafruit_AW9523.h>

Adafruit_AW9523 aw;

uint8_t Red1 = 10;  // 0 thru 15

void setup() {
  // put your setup code here, to run once:
    Serial.begin(115200);
  while (!Serial) delay(1);  // wait for serial port to open
  
  Serial.println("Adafruit AW9523 GPIO Expander test!");

  if (! aw.begin(0x5B)) {
    Serial.println("AW9523 not found? Check wiring!");
    while (1) delay(10);  // halt forever
  }

  Serial.println("AW9523 found!");
  aw.pinMode(Red1, OUTPUT);
}


void loop() {
  // put your main code here, to run repeatedly:

 aw.analogWrite ( Red1,0);
 delay (1000);
 aw.analogWrite ( Red1,255);
 delay (1000);
}```

livid osprey Jul 15, 2021, 1:50 AM

#

Is the common anode connected to a voltage supply or gnd?

tight badge Jul 15, 2021, 1:52 AM

#

vin, which is the voltage rail on the AW9523 I believe

livid osprey Jul 15, 2021, 1:52 AM

#

Do you have a resistor between the cathode and your gpio?

tight badge Jul 15, 2021, 1:54 AM

#

I don't think it's necessary with the aw9523 as it is setup for LED projects

livid osprey Jul 15, 2021, 2:00 AM

#

Ah. Did you try AW9523_LED_MODE instead of OUTPUT?

tight badge Jul 15, 2021, 2:01 AM

#

That worked!!! Thank you!!

lucid minnow Jul 15, 2021, 4:37 PM

#

lucid minnow Hello, I am using the Adafruit LSM6DSOX board with the Adafruit LSM6DSOX library...

Bumping this question, because I'm still having the same problem

north stream Jul 15, 2021, 4:38 PM

#

I'm guessing either you're trying to do too much in the interrupt routine (I usually just set a flag in the interrupt routine and then test the flag in loop()), or something isn't keeping up.

lucid minnow Jul 15, 2021, 6:02 PM

#

*facepalm yes! Thank you thank you thank you!!!!!

lucid minnow Jul 15, 2021, 6:22 PM

#

Turns out the getEvent function takes roughly 2700us to complete. So, now I don't understand that if the sensor is rated for 6.66kHz and there's the option of setting that in the library, why does the library not support reading from the sensor at 6.66kHz.

#

If I put the getEvent function in main loop, and take the readings at the timer interrupt, I get squarish readings, something like zero order hold i.e. until the new reading comes along, my buffer will keep storing the old value

#

So how do I get the sensor to work at the mentioned rate while using this library https://github.com/adafruit/Adafruit_LSM6DS

GitHub

adafruit/Adafruit_LSM6DS

Contribute to adafruit/Adafruit_LSM6DS development by creating an account on GitHub.

lucid minnow Jul 15, 2021, 7:51 PM

#

Welp. The effective rate of the LSM6DSOX is limited to about 380Hz using the Adafruit library because of the Adafruit Sensor library's getEvent function taking approx. 2560us to complete, whether it be one address or three addresses or six. Some consolation can be found in ST's own Arduino library(https://github.com/stm32duino/LSM6DSOX/blob/master/examples/LSM6DSOX_FIFO_Polling/LSM6DSOX_FIFO_Polling.ino), but using that the straightforward datarate is limited to 1667Hz using their Get_X_Axes() function, because it takes about 512us to complete. However, the full 6667Hz rate can be obtained using their FIFO buffer method. Not that I need it, but throwing this out there in case someone else came searching for this.

north stream Jul 15, 2021, 7:52 PM

#

After you mentioned it, I was wondering about it too, thanks for elaborating!

lucid minnow Jul 15, 2021, 8:10 PM

#

Thanks for nudging me in the right direction. I'm not proficient at embedded progamming, and not very inclined to get down and dirty with registers when all I need is to slap a sensor onto something and get those readings. I really appreciate the libraries that developers put out there!

north stream Jul 15, 2021, 8:11 PM

#

They're sure handy, but sometimes we come up with use cases they didn't provide for.

lucid minnow Jul 15, 2021, 8:12 PM

#

Can't complain when it's free 😆

north stream Jul 15, 2021, 8:13 PM

#

Truth

vivid rock Jul 15, 2021, 9:49 PM

#

lucid minnow Welp. The effective rate of the LSM6DSOX is limited to about 380Hz using the Ada...

That is useful.
But to be honest, I can hardly imagine why one would need rate of more than 1kHz. For any scenario I can imagine -including sensor fusion - 500Hz is plenty....

pine bramble Jul 16, 2021, 4:09 PM

#

i have a question about the adafruit motor shield. I was wondering if the 9 and 10 pins are in use only while there is a servo motor. so like can i use the pins if i dont use them for a stepper.

#

https://learn.adafruit.com/adafruit-motor-shield-v2-for-arduino/using-stepper-motors

Adafruit Learning System

Adafruit Motor Shield V2

Stackable, high current DC and Stepper motor shield

north stream Jul 16, 2021, 4:17 PM

#

Yes, GPIO pins 9 and 10 are simply routed to the signal pins on the servo connectors. If you're not using those connectors, you are free to use those GPIOs for other purposes.

south tinsel Jul 16, 2021, 5:25 PM

#

What does the capacitor do in this circuit? Is it debounce or something else? https://z4ziggy.wordpress.com/2014/06/13/arduino-keypad-with-1-analog-pin/

Ziggy's of the world

z4ziggy

Arduino keypad with 1 Analog pin

Here is my circuit design for Arduino keypad, using only 1 analog pin (instead of 7 serial pins), 6 resistors (can be reduced to 5) and 1 capacitor: And now for the full story: I decided it’s time …

north stream Jul 16, 2021, 6:05 PM

#

It looks like the capacitor just serves as a filter to smooth out the voltage to provide less noise.

south tinsel Jul 16, 2021, 8:00 PM

#

north stream It looks like the capacitor just serves as a filter to smooth out the voltage to...

Okay, thank you! Would I be okay using a much smaller capacitor then? (don't have that exact one)

north stream Jul 16, 2021, 8:04 PM

#

The specified one is 0.01µF which is fairly small, not sure what you have on hand.

#

Realistically however, it's not critical at all and the circuit should basically work even with no capacitor at all, it just might have some noise pickup and occasionally read the wrong key.

livid osprey Jul 16, 2021, 8:36 PM

#

north stream Realistically however, it's not critical at all and the circuit should basically...

If you are okay with a slightly slower response, you could even handle the filtering on the software side...