help-with-arduino

[leaden walrus]

or not a compile output

did you see that when uploading the blink example?

[fair jasper]

i don't recall. uploading is no longer working:

Traceback (most recent call last):
File "C:\Users\tract\AppData\Local\Arduino15\packages\megaTinyCore\hardware\megaavr\2.6.10/tools/prog.py", line 286, in <module>

[leaden walrus]

go back to blink example and try to get that working again

[fair jasper]

i pulled out the stemma wire and hard-connected USB power to the Vin & G pins. clock @ 20.

going back to the blink...

Something about fuses on the blink upload. Error is:

pymcuprog.serialupdi.application - WARNING - Cannot read SIB, hard reset...
pymcuprog.serialupdi.physical - INFO - Sending double break
pymcuprog.serialupdi.physical - INFO - Double-break sent. Retrying.
pymcuprog.serialupdi.physical - INFO - Opening port 'COM14' at '57600' baud
pymcuprog.serialupdi.application - ERROR - Hard reset failed.
Traceback (most recent call last):
  File "C:\Users\tract\AppData\Local\Arduino15\packages\megaTinyCore\hardware\megaavr\2.6.10/tools/prog.py", line 286, in <module>
    main()
  File "C:\Users\tract\AppData\Local\Arduino15\packages\megaTinyCore\hardware\megaavr\2.6.10/tools/prog.py", line 128, in main
    return_code = pymcuprog_basic(args, fuses_dict)```

[leaden walrus]

what are you using for a UPDI programmer?

[fair jasper]

adafruit FTDI Friend

[leaden walrus]

attached with a resistor like this?
https://learn.adafruit.com/adafruit-attiny817-seesaw/advanced-reprogramming-with-updi#step-3138713

[fair jasper]

yes, the top picture

[leaden walrus]

not sure then. maybe check all the connections, etc.

seems like something basic is not working in terms of UPDI progamming

it might also be driver related, for the FTDI, but would expect that to have been an issue much earlier

[fair jasper]

ok, I'll wiggle the wires (which usually works, unfortunately) and look for the short. let's try again tomorrow, perhaps... it's dinner time here on the east coast.

thank you SO MUCH for your time. It's really helpful.

[leaden walrus]

ok. good luck. keep just trying the blink example upload.

change blink rate, upload again, etc.

to work out all the possible kinks with UPDI programming

[fair jasper]

will do

[heady escarp]

Hi, I have a question about some weird movement of some servos I have connected in my metro Express M0, this happen every time I power cycle the board. Not sure if it's the right forum?

[pale wadi]

Hi! I hope this is the correct forum.

I have an ENS160 sensor connected to a raspberry pi (double checked the wiring) and this script

import smbus
import time

ENS160_I2C_ADDRESS = 0x53  # Adjust if needed

bus = smbus.SMBus(1) 
def read_ens160_co2(bus):

    CO2_DATA_REG = 0x24  # from data sheet
    co2_bytes = bus.read_i2c_block_data(ENS160_I2C_ADDRESS, CO2_DATA_REG, 2)
    co2 = (co2_bytes[0] << 8) | co2_bytes[1]
    return co2

To read the sensor data, but read_ens160_co2 always returns 0. Am I missing something obvious ? (i2c detect also shows the device and on the same chip i can also read the temperature AHT21, but the co2 value is just always empty) Would be very thankful for any advise here 🙏

[fair jasper]

I figured out my UDPI issues and deduced that one ATtiny is fried (or there's a short on the soldered parts). It does not I2C scan when the other ATtiny does.

So how do I change the default firmware to work for a servo?

[eternal cloud]

This is the Arduino channel, and you're using CPython on a Raspberry Pi... so not the correct forum 😉
Try https://discord.com/channels/327254708534116352/538149593246859313

Adafruit does have a CircuitPython library for a ENS160 board, that you can use directly (if you install the blinka compatibility layer on your rasp pi), or take inspiration from:
https://learn.adafruit.com/adafruit-ens160-mox-gas-sensor/circuitpython-python
https://docs.circuitpython.org/projects/ens160/en/latest/

[eternal cloud]

Are you using Arduino code on your Metro Express? Then right forum.
If not, https://discord.com/channels/327254708534116352/537365702651150357 or https://discord.com/channels/327254708534116352/330406777009209346 would be more appropriate.

In any case, posting your code (and maybe pics of your wiring) would be helpful.

[leaden walrus]

if you've been able to replace the attiny and have UPDI uploading working again, start with the default firmware (PID 5690 example sketch) and make sure you can talk to the attiny via the seesaw library and generate some PWM output. the default firmware will produce PWM output, just not exactly what is needed for servos

[crisp hinge]

Hello, according to this discussion, could one of you please confirm that the schema is correct ?

For Vcc +, I connect the +12V from the power supply. For 0V, I connect the -12V from the power supply. What do I connect to the two Vin points on the left side of the diagram?

Thanks a lot for your help !

[stable forge]

madbodger only linked to that schematic to show you how to place the diode. It sounds like you already have something wired. Did you attach the relay coil directly to the microcontroller pin?

don't connect -12v as ground

we'd have to see the whole circuit

did we already point you to https://www.adafruit.com/product/5648 ?

[crisp hinge]

Ok mb my question was under the schema, madbodger linked me to linked me schema right

[crisp hinge]

Only have this

On 0v , what do I have to connect ?

The ground of the power supply ?

[crisp hinge]

^

[stable forge]

a 5v regulator does not put out +5v and -5v: it puts out 5v and ground. +5v and -5v would be a 10v difference between the terminals, and I don't think that's what you have here

if you measured it with a multimeter you would see 5v. Similarly the 12v you have coming in is probably not +12 and -12, it's probably 12v as measured across the terminals.

there are power supplies that supply both negative and positive voltages with respect to a ground reference, but I don't think that's what you have here

[crisp hinge]

Yes it’s 5v and ground mb

Same for 12v

So according to this schema do you have any suggestions of what could be done to avoid the lcd screen problem ? Or any idea on where to place the zener diode ?

[stable forge]

in the schematic you have the relay connected directly to a pin on the TTGO. Could you link to a shopping link or whatever for the relay? And what pin is the relay connected to on the TTGO?

The TTGO may not be able to drive the relay directly, depending on its current requirements

[crisp hinge]

This one ?

[stable forge]

it looks like there are two, one above the the other?

[crisp hinge]

(No the other one)

[stable forge]

yes, please specify what that part is

that's why I suggested the https://www.adafruit.com/product/5648. It would substitute for the relay altogether, and it includes the diode as well

[crisp hinge]

I’ll send you a link to the relais that I use, but the whole  « schema » is working if we change the electric strike by a simple colored led

I already bought the diode so I just need to know where to place it

[stable forge]

what kind of diode is that again?

[crisp hinge]

https://amzn.eu/d/ht0nr1j

Here is the relay

Basic one

[crisp hinge]

The diode is 1N4734

[stable forge]

ok, that is a 5.6v, so that is not going to work as a snubber on the striker (the lock, I think you mena)

because you are using 12v there. It could be used on the other side to snub the relay coil, but I don't think you need it there

[crisp hinge]

So I have to change the relay ?

[crisp hinge]

It won't work even with the Zener diode?

[stable forge]

the 12v will fry the zener, because the zener will go into breakdown at 5.6V and you are applying 12v for extended periods of time.

no, you need a higher voltage diode

[crisp hinge]

Do you have any link ? Or reference ?

[stable forge]

or just use a regular power diode, like a 1N4001

1n4148 might work too. What are the current requirements of the door solenoid?

[crisp hinge]

What is « solenoid » please ?

[stable forge]

it's hard to tell from the relay board (I found it listed other places) about whether it already has circuitry to protect against

Bobine allongée constituée par un fil conducteur enroulé qui crée sur son axe un champ magnétique quand il est parcouru par un courant.

there is a solenoid in the electric lock

do you have a supply of electronic parts or are you ordering everyting one at a time?

[crisp hinge]

I have a supply of electronic parts but not for the diode

[stable forge]

but do you have any diodes at all?

[crisp hinge]

The door is locked when it’s powered

[stable forge]

is there a spring on the lock, so that it has to stay energized to stay in one position or the other?

[crisp hinge]

I’ll ask to my colleagues

[stable forge]

any old power diode like !N4001 or a signal diode like 1N4148 (which has several hundred mA forward current capability) should work

these are very common

[crisp hinge]

Ok lets go try this, I’ll let you know

Thanks for you time and your explanation that’s really interesting !

[tame pollen]

Anyone know of a good I2C library that is compatible with Arduino Nano ESP32?

[eternal cloud]

A library for what?

If you mean I2C implementation for the board, that's part of the Arduino core, you just need to install the correct board package: https://docs.arduino.cc/tutorials/nano-esp32/getting-started-nano-esp32/

[tame pollen]

Ooh okay thank you!

[lofty nimbus]

I’m trying to add an i2c display to the mintysynth project, but there doesn’t seem to be enough memory, any ideas?

I tried to use gyveroled, but still not enough memory

[inland gorge]

There's not much RAM left on the ATmega328 running MintySynth. You could try one of I2C character displays like this https://amzn.to/3VG4kYW but it may be just enabling the Wire library (I2C) with its buffers will be too much

[lofty nimbus]

Is it weird to use a second nano to run the display and related code?

[lethal yarrow]

No, but you still have to communicate with it, so it provably won't help in this situation.

[lofty nimbus]

Outside of tapping into the existing pots, I would need to figure out getting the second nano to get the correct bpm. I feel like it wouldn’t be too hard, but I’m a noob, so I could be extremely wrong.

[lethal yarrow]

The difficult part there would likely be synchronization. Human hearing is surprisingly sensitive to phase shifts.

[lofty nimbus]

The BPMs wouldn’t be changing often, it’s more to be able to stay consistent. So if there is a delay or poor synchronization I think it would be still useful.

[lofty nimbus]

What if I determine the bpm from the pot value and not have any connection between the two arduinos. 🤔

[delicate cairn]

https://learn.adafruit.com/adafruit-ano-rotary-navigation-encoder-to-i2c-stemma-qt-adapter
Has anyone used this before? Im detecting random button pushing in my program and im not sure how to eliminate it, ive had to comment out all the button controls i had in there to get it to work but i would really like to have the functionality figured out so i can used all the buttons

[eternal cloud]

What do you mean by random, are you pressing the button or not?
Are you using the Arduino test code from the guide? If not, posting your code would be helpful

[delicate cairn]

i am not pushing the buttons but i have an OLED thts telling me that the button has been pushed

[eternal cloud]

ohhhh

it might have something to do with how you changed the example code

[delicate cairn]

oh crap whatdidido

[eternal cloud]

you took if (!ss.digitalRead(SS_SWITCH_RIGHT)) {

and made it if (!ss.digitalRead(SS_SWITCH_RIGHT) == LOW) {

[delicate cairn]

im very new at this and chat gdp has been "helping"

[delicate cairn]

i saw that erlier, i removed the ==LOW but it didnt seem to help

[eternal cloud]

it didn't? 🤔changed for all the buttons?

[delicate cairn]

yeash it was doing the same thing, do i need to add a condition to check?

[eternal cloud]

the buttons are pulled high, so they are active on low ... so basically checking for !( not ) digital read detects a press

how you wrote it is double negate, so it would detect button presses when nothing is pressed

[delicate cairn]

ok so i got rid of the ==LOW on all of them, do i need to add anything else to check if they have been pressed and like refresh? when it starts up the "buttons" is blank but if i push one it stays on the screen, not sure if thats bc it thinks its still being pressed or if its just stuck on the display, and it doesnt seem to respond to follow up

oh jk its just randomly displayed bottom and i never touched it

[eternal cloud]

if i push one it stays on the screen
I think that's correct behavior, I don't see updates to the screen to delete

So, you changed the code, removed all ==LOW and it still displays ghost presses ?

[delicate cairn]

seems that way, but its random, i may have an issue with my hardware or setup i guess, ive got it all jammed in a breadboard rn

[delicate cairn]

ok not entirely random, happens when i move the scroll wheel

[delicate cairn]

Plz don't judge my soldering

[pine bramble]

anybody got an idea why when i try to upload the factory demo to my esp 32-s2 reverse tft feather i get errors with thing not being declared?

[dusk orchid]

Make sure you've selected the correct board in the arduino IDE, and followed the arduino setup steps (install the esp32 board manager url and board support package)

[pine bramble]

i did

i fixed the error

but

now

it wont compile

[dusk orchid]

which error did you fix, and now whats the new error message (as it wont compile there should be one)

You may benefit from closing and reopening the arduino ide as it caches somethings until restarted

[eternal cloud]

hmm, that does look strange, but a bit difficult to figure out the issue... could you try running the simple sketch from the rotary guide? https://learn.adafruit.com/adafruit-ano-rotary-navigation-encoder-to-i2c-stemma-qt-adapter

it will give a clearer picture of what's going on, seeing all the button presses in the serial console

[pine bramble]

i fixed all errors and uploaded the code but theres nothing showing up the backlite is working but closes for a split second after every 2 seconds

what do i do?

is the screen broken?

let me try to fix the code

either the screen is not working properly

or theres something wrong with the usb connection

i mean everything works on the board

except the screen

[dusk orchid]

It sounds like it might be rebooting, what do you see on the serial monitor when it runs?

[pine bramble]

nothing

[silent spruce]

I am in a bit of a pickle here and would greatly appreciate any help or insights: I have 15 ESP32C3's that are continuously reading data from a BNO055 and storing that in an array. I want to send the newest sensor readout of all 15 ESPs to a central microcontroller before I pass it on through serial to my PC, I wanted to do that with an SPI bus first, but I have read that the maximum amount of devices is 9 for another ESP32 serving as a main controller. What alternatives are there? Or how would you approach this? Thanks in advance guys. If anyone needs keyboard or switches recommendation in return, let me know!

[delicate cairn]

tried that, it all works normally, i also checked the serial monitor with my code and its acting as if they are all held down

[stable forge]

Instead of using connections, you could just send data via advertising. You might lose some readings but that may not matter in your application.

example of such a project: https://learn.adafruit.com/bluetooth-le-broadcastnet-sensor-node-raspberry-pi-wifi-bridge

(just pointing it out for concept, I don't think you need the details)

[true nimbus]

for 3v3 feather boards (i have a RP2040 specifically), do the analog inputs have 0—3.3V range, or 0—5V ?

is it possible to measure 0—5V (without adding a resistor) is what i'm asking

[rough torrent]

3.3v only

Use a resistor divider to increase the range

[deep lark]

is that flux on the board?

not judging, but if it's flux i'd recommend cleaning it up

[dusk orchid]

Make sure you turn on the serial USB option in Arduino upload settings (USB cdc enable), and rebuild and upload the example again, then you should see something on the serial monitor.

[silent spruce]

Cheers, I'll check it out. Though I was aiming for 30 Hz as I want to animate something in Blender through the sensors

[fair tusk]

I want to connect a Adafruit ST7789 320x240 TFT Breakout to a Adafruit Feather RP2040 which SPI pins do i use?

[quartz furnace]

I have an ESP NOW project I am working on that has “esp_now_register_recv(OnDataRecv); handler that executes any time there is something available

Question is there a way to temporarily halt new runs until other parts of the code are finished?

I have a U-blox Cellular module from SparkFUN I’m sending out SMS messagess from a ESP NOW event

Problem is the u blox device needs a bit more time if A few events come all at once

Need to prevent it from crashing

appears you can register and unregister callbacks … tinkering around modifying code

[pulsar sand]

Hi there, I'm new to the server, I was wondering if anyone can help me, I've been playing with makecode with a cpx for a project, however a classmate of mine made something cool with arduino. My issue is I've installed the library for adafruit circuit playground, but now that I want to do something with makecode, the CPLAYBOOT won't appear as a drive on my finder window (yes I have a mac), because it's directly connected to arduino, does anyone know how i can include the cplayboot back?

[rough torrent]

Double click reset?
Also for MakeCode related queries, you can use #help-with-makecode or the MakeCode Forums 😃

[eternal cloud]

get CPLAYBOOT to appear on your board. If you're running MakeCode, click the reset button once. If you're running CircuitPython or an Arduino program, double-click the reset button. All the NeoPixels should turn green.

Just in case you don't know about this guide https://learn.adafruit.com/adafruit-circuit-playground-express , it should give you most of the info about how to use CPX

[balmy jay]

Howdy, I have a project where I need high frame rate (60fps ideally), black and white video processing on an esp32 (critical that it is esp because the system relies on espnow). The esp cam isn’t cutting it because I am stuck at a max of about 15fps because of jpeg decompression. Ideally each board is under $25 because it’s gonna be a multi camera system. Are there any boards that exist that have these capabilities? I don’t need a ton of resolution (320x240 is plenty) and my processing is just doing some threshold info and basic blob detection. If you have any way to get the performance up (I know the max of esp cam is 50fps which would be fine), please let me know.

I looked at the m5stack from adafruit but it seems identical to a normal espcam

There is some proof here that we can get higher frame rates so I will try the eloquent library tomorrow and see if I can get some better results (currently using the default espcam lib) https://github.com/bharathsudharsan/TinyML-CAM

I have an ai thinker clone from microcenter as my espcam, I’m not sure if it’s just cheap hardware holding me back or what

[balmy jay]

Looks like I read this wrong, it’s 80fps for only the extraction and classification, you are still limited by camera throughput

[balmy jay]

Ok so I found this module, HM01B0, which seems to be meant for raspberry pi pico but I think it could work with a esp32 so I might pick one up and see

If anyone knows about framerate let me know

[balmy jay]

Main thing is I can’t have any JPEG processing because it is too costly and it needs to be a direct buffer I can threshold and then blob detect

[crisp hinge]

Hello, to secure my LoRa connection, I reboot everyday all of my system at the same hour.
Actually I'm using theses types of clock (picture)
It seems like it's not precise enough; it can vary sometimes. Do you have any suggestions or whatever? Does Adafruit sell something that can be useful? Thanks.

[dapper acorn]

how do i solve the EEPROM.h issue

this is the code

(controll board is a pi pico)

[tardy iron]

pico is RP2040, which is recall lacks EEPROM. you can maybe find a library that emulates EEPROM in flash

[dapper acorn]

something like this??

iam a complete noob..

[stable forge]

RTC chips often have a timer interrupt capability. They typically bring a pin low when the alarm goes off. The low can be pulsed (down and then back up) so it can be used as a RESET toggle. See the datasheets for the chips on our RTC breakouts. https://www.adafruit.com/search?q=rtc

[tardy iron]

that’s for a different chip. it looks like the Philhower core has EEPROM emulation. what are the exact error messages you’re getting? (turn on verbose compile in settings)

[dapper acorn]

wait where are the settings😅

[tardy iron]

i don’t know. you seem to be using a newer version of the Arduino IDE that i’m not familiar with, and i don’t know what OS you’re on

[dapper acorn]

iam on windows

the error i see is

[tardy iron]

what board do you have selected?

[tardy iron]

maybe it’s a different one? can you open the board manager and look at your installed board packages for Raspberry Pi Pico or RP2040?

[dapper acorn]

i think the pi pico is the best option..

even if i choose the nano it still says that the EEPROM libary or something like that is not installed

[tardy iron]

yeah it’s looking like it’s not finding the EEPROM library correctly. try with the Arduino 1.8.x IDE? the new IDE has supposedly had some weird problems

[dapper acorn]

i can try to install that

[tardy iron]

that's… not related to the EEPROM library

[dapper acorn]

ow..

[tardy iron]

is there some guide somewhere that you're following? what are the complete error messages related to that screenshot?

[dapper acorn]

yeah a sand clock from electar ors

the complete error message is super long and includes my full name etc 100 times

i van try to edit those things out and send it

C:\Users\AppData\Local\Temp\arduino_modified_sketch_28648\sketch_apr03a.ino: In function 'void setup()':
sketch_apr03a:683:26: error: 'INPUT_PULLDOWN' was not declared in this scope
pinMode(PIN_PIR_SENSOR,INPUT_PULLDOWN);
^~~~~~~~~~~~~~
C:\Users\AppData\Local\Temp\arduino_modified_sketch_28648\sketch_apr03a.ino:683:26: note: suggested alternative: 'INPUT_PULLUP'
pinMode(PIN_PIR_SENSOR,INPUT_PULLDOWN);
^~~~~~~~~~~~~~
INPUT_PULLUP
C:\Users\AppData\Local\Temp\arduino_modified_sketch_28648\sketch_apr03a.ino: In function 'boolean process_rcv()':
sketch_apr03a:2871:24: error: 'class HardwareSerial' has no member named 'printf'; did you mean 'print'?
Serial.printf("%u Bytes in struct settings exceed 56 bytes in RTC\n\r",sizeof(settings));
^~~~~~
print

[dapper acorn]

not as long as i thought but ^^

[tardy iron]

you shouldn't be getting that INPUT_PULLDOWN missing error if you have the correct board selected

[dapper acorn]

how do i choose the board in this version?

[tardy iron]

there should be a "tools" menu that has a "board" item

[tardy iron]

https://learn.adafruit.com/rp2040-arduino-with-the-earlephilhower-core/installing-the-earlephilhower-core if it's not already installed

[dapper acorn]

its a different language for me lemme find something

[dapper acorn]

how do i know which serial port my rpi is in?

it does not say a serial port how do i connect it to arduino IDE?

[tardy iron]

i think it’s in bootloader mode. do you see a USB disk drive called something like PICOBOOT?

i think Arduino can load code that way without a serial port

[dapper acorn]

no

but i just selected every single possible thing that was in serial monitor bc i knkow all my other things have some sort of protection

sooooooo

basicly it was com6

but device manager did not say it was com6

[deep lark]

if this is your first time using arduino on rp2040, you need to manually trigger bootsel as it does not reboot to download mode automatically

[tardy iron]

the port menu in Arduino should have been able to tell you which one was the Pico, i think

[dapper acorn]

prob yess

but did i know it

nope/:

[dapper acorn]

iam only gonna program it 1 time

[deep lark]

doesn't matter, if the original firmware is not arduino then uploading the code through arduino ide does not work

try holding down bootsel and replug the pico, you should see a new storage device on your computer

now you can try upload the code and see if it works

[nocturne burrow]

Hello,

Following recommendations I saw online, I plan to power my Adafruit 32u4 feather and my Adafruit TB6612 motor driver from the from 4 AA NiMH rechargeable batteries in series for a total of 4.8V using two buck converters. The buck converter I chose was the Adafruit MiniBoost TPS61023. Before I hook up my circuit on the breadboard, I wanted to confirm that my circuit will not damage any of the components and work how I intended. Please take a look at my Fritzing diagram and let me know if everything looks good. I am using two TT Motors I believe. I got them in a robotics kit from Adafruit. According to the robot kit listing, the motors drive with 3-6VDC, use 200-400 mA to run, and have a 1.5A hard stall.

[timber void]

Hi everyone, i have a question. I recently found an AT89C2051 microcontroller and i decided to try and use my arduino to program it. The actual programming and stuff I have no trouble with, however, it needs 12v applied to the RST pin whenever you want to enable the programming mode. Then it needs to go back down to H, which is 5v, to verify the byte you just wrote. repeat x1000. So I need to find a way to apply 12v, H (and L) freely, presumably with high frequency of switching. I have looked into several ways to do it and I have talked to my much more knowledgeable friends, but i decided to ask here just in case. How would you do it?

i will also say that i don't have a lot of experience in electronics specifically, especially making stuff physically and especially especially soldering, and I am fully aware of that and i'm trying to learn

[north stream]

I'd probably have a pull-up transistor with a level shifter for each voltage level, and some logic to avoid turning them both on at once.

[timber void]

ty

[versed trail]

possible to do transparent ps/2 emulation for laptop touchpad? as in, OS uses correct drivers despite device being USB -- notably for multitouch

[hollow olive]

are there any somewhat big (5-6") displays with capacitive touch that are reasonably easy to use with arduino? i can only find up to 3.5"

[stable forge]

That is not so easy to find, because larger displays are expensive enough that they usually are for higher-end processors and don't have the display controllers that make using with weaker microcontrollers easy. You can usually find a cap touch overlay to fit over whatever display you are looking for. What is your use case?

[hollow olive]

i need to display a dashboard with information that should be displayed reasonably big so it's easy to see and i'd need it to be cap touch so it can be operated with gloves / the back of a pen / something else

[stable forge]

and what kind of arduino? Is this a battery-powered ting?

[hollow olive]

it doesn't have to be mobile, so power consumption isn't a problem, i can keep it plugged in

as to what arduino: i haven't decided yet, mostly the arduino environment is something i'm familiar with so i was hoping for a display that can be used with a popular library or something

[stable forge]

you might consider a Raspberry Pi (not Pico) of some kind instead, there are plenty of displays for that

[hollow olive]

actually i just found a 4" display that might work. i'll draw some mockups to scale and see if it could be big enough

if not i will consider some raspberry pi

thanks for the help :)

[edgy ibex]

Looking for some PlatformIO expertise here. I've switched wholesale from using the Arduino IDE to using PlatformIO. How much, if anything, of the old Arduino installations do I need to keep? Or can I uninstall / delete everything, and PlatformIO will take care of downloading its own copies of libraries that I might be using

[pine bramble]

greetings. Im building a MIDI controller with a Feather RP2040 and Arduino with Control_Surface library. I was having issues with the full-build so I downsized to a single pot and a single button. the pixel and pot work as expected, the button not at all. I have tested the continuity across the path and everything is connected and the button goes from 0 to 3v when pressed. here is the code, just pieced together from Control_Surface lib examples. not sure what Im doing wrong. any input or pointers are much appreciated.

[inland gorge]

And your MIDI receiver is listening to MIDI channel 2?

[pine bramble]

yes, my MIDI receiver is omni, (Pure Data) listening on all channels and shows which channels are receiving what messages, have also tried it in another omni software. I also tried changing the channel # to see if there was a different result and have tried listening on the specific channel# as well, as opposed to "listening" in omni.

[inland gorge]

I reread your description. It sounds like you have your button wired up as active-HIGH (goes HIGH when pressed). It’s more common to have the button wired up as active-LOW, and the Button docs assume this, even enabling the internal pull-up resistor for you so you don’t need an external one : https://tttapa.github.io/Control-Surface-doc/Doxygen/d2/daa/classCCButton.html#details

[fair tusk]

I accidentently fed 12V into an Arduino Mega pin for 2 seconds before unplugging and smelt burning. I have a Adafruit Sound FX board connected to the mega via Serial1 that stopped working. The FX board still boots and the Mega board still boots, but it wont play files. Did i burn the FX board too?

I also have a Adafruit PAM8302A amp on the output of the Right Audio pin that goes to a speaker

[pine bramble]

excellent! thanks for that... yes, I do have it setup so the button "goes high" so I will definitely try "goes low"

[tender sinew]

https://www.youtube.com/watch?v=2EbJhFAkO5g

I am trying to achieve this

wonder how it's connected

It is getting signal from that slime mold and use that number for osc

As long as I can get a certain number from arduino, I can take care of synthesizing part. But I wonder how exactly it's connected in that video.

[inland gorge]

It may be doing something as simple as a just a bare wire on an analog pin. The ambient EMF from a finger touching the metal foil can cause the analog values to change outside of some baseline. So the code may be as simple as:

void setup() {
  Serial.begin(9600);           //  setup serial
}
void loop() {
  int val = analogRead(A0);  // read the input pin
  Serial.println(val);          // debug value
}

[tender sinew]

yo! thanks for your answer. But I see two wires and one alligator clips connected to that dish

green wire seems like it's connected to one of the Analog inputs

and black wire is to ground? then what is that white alligator clip?

[inland gorge]

yep black is most likely to ground. The white jumper doesn't seem to connect to the arduino so it may be just being used to add more metal (more sensitivity) to the system

[tender sinew]

so maybe try hooking up one wire to one of the Analog pins, and another wire to the ground and see how it goes?

[inland gorge]

yep, that's what I would try

[tender sinew]

Thank you man! I will let you know how it went tmrw!

[inland gorge]

No prob. 🙂 If that doesn't work well enough for you, you should look into "capacitive sensors". There's a lot of code for doing this on Arduino. Here's one tutorial https://www.digikey.com/en/maker/tutorials/2021/how-to-add-capacitive-sensing-to-any-arduino-project

[tender sinew]

thank you so much!!

[magic idol]

Hey there

So im usng multiwii with a nano ang mpu6050 but the model on multiwii doesnt seem to update

Ive tested the 6050 and its working

[ionic shale]

Hey, I was wondering if MPU6050 would do just fine for getting the orientation of itself, since it has accelerometer/gyroscope, without a magnetomete

[orchid fossil]

Has anyone tried to utilize bit-banging on the ESP32 SDIO interface for SPI communication? I couldn't find any project online addressing this specific approach.

[pallid sage]

Found a microcontroller simulation website, Wokwi. Doesn't look evil offhand.

[dusk orchid]

Not evil, been using for a long time, love it

[crude heart]

anyone have experience with arduino and Midi CC control?

[inland gorge]

Yes

[twilit nexus]

How do I add functionality to/override functions from libraries in arduino? For example, I am trying to make a snake game on an 8x8 LED matrix and I want to use the arduino Linked List library to represent the snake. I simply want to modify the .add(newNode(x, y)) function to call the drawLED(node.x,node.y) function from another library for controlling led matrices

[stable forge]

you can copy the library and modify it.

[twilit nexus]

And then include my modified library at the top of the program?

[rough torrent]

Yes

[stable forge]

you could also write a wrapper routine that does the add and drawLED. That would not require changing the library. def add_and_draw(...

[twilit nexus]

alright thank you that was very helpful. Follow up question: If I modify, for example, the LinkedList library to call functions from another library, must I put an include statement at the top of the edited linkedList library for the other library?

[green lake]

hi everyone, i have a problem with uploading sketches to my Arduino nano esp32

i use the newest version 2.3.2

these are the error messages:

i use the windows version, the data cable works fine, and there are no problems with other boards (the elego uno r3 works fine, but it doesn‘t fit for my project. Too little analog pins)

[eternal cloud]

Did you install the ESP32 board package and select the correct board?

Also:

Note: You may see two versions for the Nano ESP32 available to pick in the board selector, one USB(COM21 in picture) and DFU(3-2 in picture). If you do, select the one with USB.
https://docs.arduino.cc/tutorials/nano-esp32/getting-started-nano-esp32/

[green lake]

yes, i selected the USB(COM21) and i had downloaded the ESP32 board package version 2.0.13

i have already tried troubleshooting on their official website, but i didn‘t find anything there

[hidden jasper]

I currently have a project I'm working on where I am using the Seeed Studio Xiao ESP32-C3 https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/

https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html

I am using the Arduino IDE to program it. My project is basically a 'switchbot' (https://www.switch-bot.com/products/switchbot-bot)

i.e ESP32-C3 using BLE, Servo Motor, and a Capacitive touch sensor. Till now, all the components are working and have been assembled together. Right now, it is housed in a 3D printed enclosure and is powered by the USB C port on the Microcontroller attached to a 5V Phone charger. Im using the RemoteXY (https://remotexy.com/en/editor/) app for controlling the 'switchbot'.

I plan to make this device battery operated. The present setup draws a bit of current. Only enough for it to run about 28 hours on a 2000mA battery.

I looked around a bit and found out that the ESP32-C3 has a couple of sleep modes which unfortunately disables the WiFi and BLE. I also found out that in the Modem Sleep Mode, I can configure the wireless connections to be active. I thought of setting a WiFi or BLE wakeup trigger and keep the ESP in modem sleep mode the rest of the time.

I cant seem to find any way or method to do this in the Arduino IDE. If anyone can help me do this that would be great.

If not possible can you suggest some other low power micro controller whether using WiFi or BLE(Preferrable) to get this project done.

Thankyou in advance😊😊

Help

[inland gorge]

Presumably you're using the arduino-esp32 Arduino core from Espressif. On their documenation site for the core, there's a section on their APIs for Deep Sleep: https://docs.espressif.com/projects/arduino-esp32/en/latest/api/deepsleep.html

There are also several tutorials on the net, good keywords are "esp32 arduino sleep". Here's a couple:

• https://randomnerdtutorials.com/esp32-deep-sleep-arduino-ide-wake-up-sources/
• https://www.instructables.com/ESP32-Deep-Sleep-Tutorial/

While these are all for the original ESP32, I believe they should work for ESP32-C3, as Espressif's docs for arduino-esp32 don't see to call it out.

[hidden jasper]

I need BLE function to be on at all times
All the sleep modes on the ESP-32 turn off RF capabilities by default

These are from the ESP32-C3 documentation on expressif

This says that I can opt to keep WiFi or BLE on during Modem Sleep mode

I dont know how to do this

Googled the h*ll out of it on how to keep BLE on during Modem Sleep, couldnt find anything useful

Im not that advanced on the ESP32s'

So it would be helpful if I got some directed towards some Arduino code to do this

[inland gorge]

This article seems to cover it a bit: https://mischianti.org/esp32-power-saving-modem-and-light-sleep-2/ but I don't see any real Arduino APIs for doing this, so you may need to drop down into ESP-IDF to do it. I think this is the page that gives some examples on that: https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/system/sleep_modes.html#application-example

[ornate storm]

what's the right syntax to send values to a characteristic using the Bluefruit library? e.g. send "1234567" to some characteristic?

I can't seem to get it to work. I've tried .write with a hex byte representation of the data, I've tried sending single digits at a time, I've tried reversing the order just in case, etc

[ripe coral]

Hello, i'm using an Arduino MKR Wifi 1010 with an Adafruit PMSA003I Air Quality Breakout.

I'm uploading a sketch with that uses the Wifi card. The problem is:

• When uploaded from computer, sketch works
• When disconnected from power and restarted, CHRG light is on and flickering fast, WiFi.begin() stops working.
• When the PMSA003I sensor is disconnected from the Arduino, and Arduino is restarted, CHRG light does not appear anymore.

Does anyone know what the problem is?

Edit:

The problem is fixed, I did:

1. Disconnect sensor when starting up
2. After WiFi has been connected, reconnect sensor

[eternal cloud]

ideally you wouldn't want to live connect sensors, like you're describing
how are you powering the project when it's not connected to computer ?

[ripe coral]

Oh I use the same USB cable but it's connected to a 5V power adapter connected to the mains

[eternal cloud]

I see ... I'd say that what you're describing sounds like a powering problem, but I'm not sure what 🤔

[ripe coral]

I think so too. I suspect that there's not enough power to run the sensor and to boot the WiFi chip on the arduino itself lol

[native dagger]

If a library doesn't have any Avr specific stuff in it, and just relies on the base arduino library, can I probably run it on any arduino capable board (assuming pins are compatible with what the arduino does)?

E.g. Accel Stepper on an esp 32 s2?

[north stream]

Probably usually sometimes but with some exceptions

[quartz furnace]

question about modifying a sketch that uses Software Serial to use serial2

this will be on a ESP32 , so instead of software serial it just needs to be used with Serial2

i know i’ll have to remove the #include SoftwareSerial line …..

just how do i name the Serial2 as the SIM7670….

or should I just declare Serial2 and replace the SIM7670 commands in all of the code ?

[leaden walrus]

if you're talking about the predefined (in board support package) hardware serial interface, it'd be Serial2 in code. the RX/TX pins used for Serial2 are preset and specific to whatever board being used, so would want to look at board's pinout for those.

not all boards will have a Serial2

[north stream]

If you don't want to change the rest of your code, you could make the preprocessor do the substitution for you: ```arduino
#define SIM7670Serial Serial2

[native dagger]

Any tips on exceptions ?

[north stream]

Depends on the bit width of the timers, whether the library accounts for that properly, word width issues in general, that kind of thing

[crisp hinge]

Hello,
We did this on our "test" installation and it works !
But when we tried on the two doors which were doing this, nothing changed ... do you have any idea ? Maybe we could add a diode on the powersupply of the lcd screen ?

I remember @.Madbodger you were the first to suggest a zener diode, if you have any suggestions I really like to hear about it ! Thanks

[native dagger]

Would the bit width need to be more? Word width? How would I check those?

[north stream]

Heh heh heh, your best bet is to try it and see.

No point doing debugging if it works.

[mighty elbow]

The serial ports on 2 of my arduino unos and a brand new mega are\ greyed out

I used 3 different cabled, went into device manager, checked the drivers, nothing is working

does anyone have any other ideas how to ungrey the serial ports

[eternal cloud]

Isn't your board on COM4 in device manager? The pic looks like COM4 is selected, working fine.

[mighty elbow]

The words “serial ports” are greyed out

Wait is that supposed to be greyed out?

If it is I feel incredibly stupid lol

[supple turret]

Looks like a menu header.

[eternal cloud]

mine looks the same, it's just a list of available com ports under the grey out words

not the smartest UI design choice, but what can you do 🤷‍♀️ 😆

[mighty elbow]

OH!!

yeah that UI choice is pretty confusing

it looks like a selectable menu

[fast jacinth]

Hi all, I am trying to use a reverse tft esp32-s3 feather with a music maker featherwing, but i am having some trouble getting it to work. I think the problem is that I don't have the correct pins mapped, as it works on my huzzah v2 just fine. Can anyone confirm if these are the correct pins for the tft, or point me towards the correct numbers?

// Feather ESP32
#elif defined(ESP32) && !defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
#define VS1053_CS 32 // VS1053 chip select pin (output)
#define VS1053_DCS 33 // VS1053 Data/command select pin (output)
#define CARDCS 14 // Card chip select pin
#define VS1053_DREQ 15 // VS1053 Data request, ideally an Interrupt pin

[vague shale]

https://github.com/adafruit/Adafruit-ESP32-S3-Reverse-TFT-Feather-PCB/blob/main/PrettyPins Adafruit ESP32-S3 Reverse TFT Feather Front Pinout.pdf

[livid osprey]

See above and compare to the HUZZAH32 pinout (https://github.com/adafruit/Adafruit-HUZZAH32-ESP32-Feather-PCB/blob/master/Adafruit HUZZAH32 ESP32 Feather Pinout.pdf) the original code was written for. The S3 might not have existed when that code was written...

[fast jacinth]

hmm, I found this earlier but I am having trouble telling which pins are suitable for this. I cross compared that diagram with the Huzzah V2 one, but I am not sure how to tell which pins I can assign for chip select, etc

https://cdn-learn.adafruit.com/assets/assets/000/123/406/original/adafruit_products_Adafruit_ESP32_Feather_V2_Pinout.png?1691707257

[fast jacinth]

For example, would I be able to do pins 12, 11, 10, 9 respectively? Or do they not have the correct characteristics

[dusk orchid]

those all look non special, and chip select (CS) can usually be any gpio pin. I think with the s3 reverse tft as long as the pins are not already in use and not input-only pins you should be fine picking any replacements pins.
(the huzzah32 v1 also known as feather esp32 is not quite the same as the huzzah32 v2 also known as esp32 feather v2 just so you're aware there can be differences, but the pins used in that pasted code aren't any special function pins on either version of the esp32 feather v2/v1 so you'll be fine picking any new pins on the esp32s3 reverse tft feather)

[lean wigeon]

Hello! I have a quick question regarding the Gemma M0 Arduino. Can it support coding for various functions such as light sensor integration or random blinking, or is it limited to just standard blinking and fade in/out (I'm using Sequin LED)? I have conducted some research on the Gemma M0 and am considering purchasing one, but I would greatly appreciate any insights or comments from those with experience😊!

[north stream]

It's a fairly powerful CPU and should be able to support lots of fancy coding

[lean wigeon]

Thank you! Would you recommend using MakeCode or Arduino IDE for programming the Gemma M0?

[fast jacinth]

I tried assigning the pins to free GPIO pins on the reverse tft s3, but it still isnt working for some reason. I am just trying to run the feather_player example of the music maker shield. Does anyone know why this might not be working?

#define VS1053_CS 32 // VS1053 chip select pin (output)
#define VS1053_DCS 27 // VS1053 Data/command select pin (output)
#define CARDCS 33 // Card chip select pin
#define VS1053_DREQ 15 // VS1053 Data request, ideally an Interrupt pin

[eternal cloud]

If you stacked your boards, you can't just assign random pin numbers, they need to be mapped to the pins the featherwing uses.

This is the pinout for the reverse feather https://learn.adafruit.com/esp32-s3-reverse-tft-feather/pinouts (btw, it shows that gpio 33 is assigned to the on board neopixel, and gpio 32 doesn't even exist, so... )
and this is for the music maker https://learn.adafruit.com/adafruit-music-maker-featherwing/pinouts

These are the pin locations you need to use

Mapped to your feather:

(If you do **NOT **stack your boards, or use a doubler, you can use other feather pins, but they will need to be wired separately to the 4 music maker control pins)

[north stream]

Arduino is text based programming and is pretty versatile but can take a little while to learn. I've never used makecode, but I think it's a graphical sort of programming (like Scratch) and may be more limited in what it can do.

[fast jacinth]

Thank you! The second link is what I was looking for. It looks like I accidentally tabbed into my ESP32-V2 pinout schematic by mistake, which explains my wonky pinouts.

It looks like the control pins might not be the problem after all. For some reason it looks like the board keeps restarting constantly when i run the program. It gets through the very first part of startup, then I hear the USB disconnection noise and the board has to reconnect. I have also tried commenting out the while (!Serial) { delay(1); } bit, but it looks like that wasn't it either.

The board works fine for other sketches, so I don't think its a hardware problem. Any ideas?

[edgy ibex]

I'm trying to get a clear grasp of how the ADS1015 works. If I set the gain to GAIN_ONE but then only supply VDD with 3.3V from a Feather microcontroller, the maximum voltage I can apply to the analog input pins is 3.3V (actually 3.6, but I'm a firm believer in being safe).
Am I correct in thinking that this means I won't be able to measure with the full range of [0 .. 4095] values, since the very top end voltages between 3.3V and 4.096V will mot be available to me?

[leaden walrus]

0 to 3.3V is the full range and should generate raw ADC values 0 to 4095

[charred salmon]

Speaking of ADC, I just realized a much better way of getting my averages. I'm doing a joystick project, and the computer will expect a range of 32000 in each direction, but the M0 only has a 12bit ADC. I could oversample by taking 4 readings, and averaging. But division and floating point math is slow. Plus I have to multiply the final number by 16. So, why divide? Just take the sum of my samples and multiply that by a smaller number.

Yay math!

[atomic citrus]

High everyone. I’m trying to determine if I blew up my adafruit m4 metro airlift lite board. When plugged into usb to computer the bootloader mode seems to work but once in normal mode the RX and TX lights just stay solid and it won’t accepted code. I have tried flashing the bootloader and that seems to work. We started experiencing issues after we might have tapped 6 v into the SDA and SCL pin I’m not sure if it actually hit or not.

If I can flash the boot loader is the board likely fine?

[eternal cloud]

"tapped"... 6V... ?
You could try installing CircuitPython on the board, instead of Arduino code, see if that works.

[atomic citrus]

Pretty sure after some further testing that the board is fully cooked but thanks!

[sonic monolith]

Hello all does anyone use a mac for programming? I’m currently using Ada PCB boards and everything is working well. The only issue I’m having is I cannot find the device on my Mac. Normally when I add a flash drive it pops right up. My driver is up to date and able to send code I just cannot find the name of the PCB on my finder

For example I do not see what’s circled in yellow to the left. I do not see The feather listed

[inland gorge]

I'm not sure I understand. It''s listed on the left as FEATHRBOOT, the UF2 bootloader for your board. The part on the right is the contents of the FEATHRBOOT "disk". These aren't real files but a way to see what version of the UF2 bootloader the board is running

[livid osprey]

Which feather? Not all feathers will pop up as a flash drive.

If you take a nice close-up of the board, we can help identify it that way, too.

Also, the INFO_UF2.TXT file should contain more information regarding your board.

[sonic monolith]

The picture was an example of someone else screen. I figured it out from Adafruit learn section. When you connect a board via usb you have to manually trigger Bootloader mode for the drive to be recognized as USB. Thank you so much for responding I’m new to this

[sonic monolith]

Thank you so much apparently as you mentioned not all feathers pop up. I was not aware that you had to manually trigger boot loader mode to show as a flash lol

[tardy iron]

the demo/test firmware shipped on a lot of Adafruit boards usually isn’t something like CircuitPython, so it won’t appear as a drive unless you select bootloader mode

[sonic monolith]

Yes now I’m able to see the drive. For some reason my Itsybitsy and Trinket will not go into bootloader Mode I’m not sure if that is due to the wire I’m using. it’s a ps4 usb when I try to send code to either the Itsybitsy or the trinket i get an error code “cannot execute upload tool” / “Bad CPU type in excutable “ I only get that message when using that usb

[tardy iron]

the bootloader entry signal varies for different boards. sometimes it’s a boot button you hold down during reset; sometimes it’s a double click of reset

[peak shell]

hello i'm using the qtpy rp2040 via stemma qt with an aht20, a ssd1306 display and the scd30 co2 sensor with arduino programming. The problem is that the library for the scd30 not "if (!scd30.begin(&Wire1))" accepted. So it is possible to use the scd30 with a qtpy rp 2040 via stemma qt? With the aht it is working by using "(!aht.begin(&Wire1))"
Thanks a lot

[eternal cloud]

https://learn.adafruit.com/adafruit-qt-py-2040/i2c-scan-test

[pine bramble]

Hey guys, I was wondering if I can code the arduino Uno with no components in and then connect them after finishing the coding ?

[inland gorge]

Yes. You can both Verify and Upload code without wiring up any of your sensors or outputs to the Arduino. But it may not run, if the libraries you're using for your sensors expect a response (like I2C sensors)

[craggy tusk]

hi , i just bought the adafruits music maker mp3 shield, solder the headers but getting fail error not sure why as i made the right connections

[pine bramble]

Oh so if I have an I2C communication between arduino uno and raspberry phi zero 2 W. Should I keep them wired and code?

[livid osprey]

Could you share the underside of the music maker board? Cold solder joints are pretty common among new enthusiasts.

[peak shell]

Oddly enough, both the SCD30 and the AHT work with a Stemma QT connection using

if (!scd30.begin(97,&Wire1,0))
...
if (! aht.begin(&Wire1))
...

[craggy tusk]

Sure

I will resolder, has been 5 years since last time I solder and just now getting right back innit

[eternal cloud]

The soldering definitely needs to be redone completely.

How do you connect your Arduino board though? The shield is supposed to plug into the board, I don't see how you can do that

[eternal cloud]

hmm... that is weird 🤔
did you manage to get everything working then?

[craggy tusk]

redone and same problem

[craggy tusk]

its connected to my giga board which passes through a 5v usb from pc

[eternal cloud]

You don't show the connections to your microcontroller board, so we cannot check if they are correct or not.

[craggy tusk]

Additional connection made on shield
Jumper wire - Rx to D2

5v and gnd connected to Arduino board

[obsidian knoll]

@north stream Hey follow up question for you about this - i am trying to understand the function of the *s in the struct.

What is the purpose of

char* ssid;

[stable forge]

See #welcome message for how to format code. Your * and _ are disappearing.

[obsidian knoll]

whoops, sorry.

discord what the heck

[stable forge]

it's markdown

[obsidian knoll]

i am using the proper format, i do it all day. but why isnt it working lmao?

[stable forge]

are you using backticks??

[obsidian knoll]

yes

i use this literally all day in discord troubleshooting other software haha

it works here

but as soon as i put char ssid inside it, it breaks.

char* ssid;

ok i guess that message is just bugged. very strange

[lethal yarrow]

Looks ok to me.

[lethal yarrow]

On your system, discord is probably interpreting the * as markdown. Try putting a \ in front of it.

[obsidian knoll]

there we go.

struct wifiCredStruct {
  char* ssid;
  char* password;
};

vs

struct wifiCredStruct {
  char ssid;
  char password;
};

why am I using the * in the first example? what is the purpose? I know that * usually means "this is a pointer" but how am I making a pointer to the concept of char?

[obsidian knoll]

its just that one message that is broken. theres a nbsp or something hidden in it that i cant delete

Apparently it's just my desktop? Works fine on my phone? Odd.

[stable forge]

a char* is almost always a pointer to a string. so char *ssid is the pointer to the first (0-th) char in the string. these strings are almost certainly null-terminated, because no length is given.

[obsidian knoll]

For context I'm using this to store pairs of wifi ssid + password

Just trying to understand, what exactly it's doing lol

[lethal yarrow]

Yep, it's a string pointer. Well "string" since C really only has char arrays.

But yes, it is a pointer to the first character of a (null-terminated) string.

[obsidian knoll]

It works, but I don't know why or what the best practices are. I think what you're saying is that, because I don't actually know how long the entry might be, the pointer allows me to just point to the first character instead of having to define the size?

The other half that I don't understand is that I'm referencing the struct without dereferencing or anything - just wificreds.ssid or whatever. How is this working? If the data itself is a pointer to the first char?

[lethal yarrow]

The struct itself also exists in memory. If it's stack-allocated, the compiler handles its address, and individual elements are accessed based on their offsets.

[stable forge]

the string itself is NOT in the struct. A pointer to the string is in the struct

[obsidian knoll]

Here's the full context of how I'm using it:

struct wifiCredStruct {
  char* ssid;
  char* password;
};

const wifiCredStruct wifiCreds[] = {
  { "ssid1", "password1" },
  { "ssid2", "password2" },
  { "ssid3", "password3" }
};

  for (int i = 0; i < sizeof(wifiCreds) / sizeof(wifiCreds[0]); i++) {
    Serial.println(wifiCreds[i].ssid);
    Serial.println(wifiCreds[i].password);
  }

[stable forge]

a pointer is just a memory address.

[obsidian knoll]

I see.

[stable forge]

so what happens is that the compiler makes a null-terminated string, whose address is in the struct. You don't even see this address explicitly, it's just somewhere in program memory.

if i were to draw a diagram I would draw an arrow from char *ssid to the first of a bunch of consecutive bytes, in increasing memory locations. Each byte contains a character in an ssid string. At the end of the string there is a zero-byte ("zero terminated")

[obsidian knoll]

Got it.

In my application, in execution, is there any difference at all between using the pointer and not?

98% of examples don't use it

[lethal yarrow]

98% of the examples are wrong then.

[obsidian knoll]

Interesting

[stable forge]

in C, strings are usually passed around with pointers. An API that take C strings takes char * arguments

[obsidian knoll]

https://learn.adafruit.com/circuit-playground-simple-simon/the-structure-of-struct#:~:text=A struct comes from the,information from a single reference.

Random example here.

[stable forge]

there are no strings in that example

[obsidian knoll]

Oh - so it's specifically a "string" thing

Ahhhhhh. Okay. I understand

[stable forge]

because a string is an array of data, not a single element

[obsidian knoll]

"strings" don't actually exist, right? It's an abstraction in Arduino for the sake of ease of use

[stable forge]

they exist, but they are not scalar values

single-element values

The C compiler knows about zero-terminated strings: thats what the "abc" notation is all about

Arduino is C and C++

with a bit of extra fluff (it does forward declarations for you)

[obsidian knoll]

Sorry - exist as in, they're not a data type like int etc.

Got it. Makes perfect sense

[stable forge]

they are not a scalar data type. And there is no string reserved word

[obsidian knoll]

This is really helpful

[stable forge]

but "abc" is a char *

A good intro to C would probably be helpful

[obsidian knoll]

Got it.

Follow up question - is there a better or more efficient way of doing what I'm doing?

[obsidian knoll]

Yeah I'm trying to unlearn the Arduino jankiness.

[stable forge]

Understanding address spaces, addresses, and pointers, is an aha moment

if you learned a little bit about machine language and the like, it might become clearer

unfortunately this is not often taught

[obsidian knoll]

After starting to understand some of the important parts of cpp, going back to other languages is so frustrating. Everything is so wishy-washy, I end up debugging useless junk that cpp would have streamed at me for

JavaScript functions returning numbers as strings, etc etc etc

[stable forge]

https://www.amazon.com/Designing-Embedded-Hardware-Computers-Devices/dp/0596007558 is an older book but covers this kind of thing

[lethal yarrow]

That's just JavaScript being a mess.

Not really comparable to C++ though, since JS is dynamically typed (like python).

[obsidian knoll]

For sure

[cold lagoon]

Hey i just wanted to test some analog sensors but my ESP8266 keeps boot-looping. The issue is the map() function and setting fixed ADCmax and ADCmin values fixes the boot-loop, im just wondering why the esp crashes when the values aren't fixed.

#include <Arduino.h>
#define adc A0

int ADCmax = 0;
int ADCmin = 1000;

void setup() {
  Serial.begin(115200);
  pinMode(adc, INPUT);
}

void loop() {
  int adcVal = analogRead(adc);
  if (adcVal >= ADCmax){
    ADCmax = adcVal;
  }
  if(adcVal <= ADCmin){
    ADCmin = adcVal;
  }
  if(ADCmax == 0 || ADCmin == 0){
    ADCmax = 650;
    ADCmin = 450;
  }

  int mappedADC = map(adcVal, ADCmin, ADCmax, 0, 1000);
  Serial.println(mappedADC);
  delay(25);
}```

[stable forge]

what do you mean "aren't fixed"? How is the code you gave different?

Note that analogRead returns 0-1023

what range are you trying to convert 0-1023 to?

[cold lagoon]

by "fixed" i mean declaring min and max as an int before setup or just as a number in the map() function like this int mappedADC = map(adcVal, 450, 650, 0, 1000);

[cold lagoon]

im trying to convert the range from alltime min and max to 0-100 (0-1000 in my code i just wanted to try 1000 and forgot to change it)

so the all time min would be 0 and the all time max would be 100

[stable forge]

but so then the range would change as the values changed, and your calibration would change

[cold lagoon]

yes it would adapt to the new min and max values each loop cycle

[stable forge]

but then the value returned isn't calibrated. One cycle 100 might be 1.5V another cycle it might be 3V

are you trying to do like an AGC?

[cold lagoon]

and in the next cycle 1.5V wouldn't be 100 but 50. That's exactly what i want. I dont know what an AGC is

[stable forge]

automatic gain control

so the min/max of one cycle depends on the previous cycle?

[obsidian knoll]

probably trying to auto range a pot or something

[cold lagoon]

tbh i just wanted to test some Halleffect sensors and threw together some code to do so. I was just wondering why id doesnt work 🙂

[stable forge]

so supposed analogRead() returns, say, 2, all the time? Then the first time you want it to return 2, and the next time it returns 100?

I agree I don't understand why your program would crash. I don't see anything that would cause it to crash

[obsidian knoll]

honestly, it seems like esp jank to me. i have had a number of these issues.

only thing i can think is that this is breaking something.

[stable forge]

nope that should be fine

[leaden walrus]

@cold lagoon by "fixed" you mean these lines?

int ADCmax = 0;
int ADCmin = 1000;

you're wondering why it crash loops without those?

[cold lagoon]

something like that yes. as 2 is the all time max it should be 100

[obsidian knoll]

which esp is it, specifically?

fought a bootloop on a c3 yesterday only to find that it had to be power cycled after flashing to work properly.

[cold lagoon]

this is the "fixed" code that works without crashing

#include <Arduino.h>
#define adc A0

int ADCmax = 0;
int ADCmin = 1000;

void setup() {
  Serial.begin(115200);
  pinMode(adc, INPUT);
}

void loop() {
  int adcVal = analogRead(adc);
  if (adcVal >= ADCmax){
    ADCmax = adcVal;
  }
  if(adcVal <= ADCmin){
    ADCmin = adcVal;
  }
  if(ADCmax == 0 || ADCmin == 0){
    ADCmax = 650;
    ADCmin = 450;
  }

  int mappedADC = map(adcVal, 450, 650, 0, 1000);
  Serial.println(mappedADC);
  delay(25);
}```

[leaden walrus]

what is the code that crashes?

[cold lagoon]

this one

[cold lagoon]

lol i had a crashing esp c3 too yesterday. this one is an ESP8266 12E tho

Out of curiosity i tried it with Arduino IDE (instead of VS-Code) and i get the same result there

[obsidian knoll]

there is absolutely no reason why this should not work. you may want to try nuking the esp and setting the core debug to highest

[cold lagoon]

tried some other esp8266 boards its the same everywhere. Here is the Serial monitor output if anyone has the time, but don't make it a big deal i don't really need it i was just curious:

epc1=0x4000dce5 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000  

>>>stack>>>

ctx: cont
sp: 3ffffdf0 end: 3fffffc0 offset: 0190
3fffff80:  402023a3 0000001c 00000000 feefeffe  
3fffff90:  3fffdad0 00000000 3ffee5b0 40201093
3fffffa0:  feefeffe feefeffe feefeffe 40201da0
3fffffb0:  feefeffe feefeffe 3ffe85dc 40100fad  
<<<stack<<<

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3460, room 16
tail 4
chksum 0xcc
load 0x3fff20b8, len 40, room 4
tail 4
chksum 0xc9
csum 0xc9
v00042780
~ld

SDK:2.2.2-dev(38a443e)/Core:3.0.2=30002000/lwIP:STABLE-2_1_2_RELEASE/glue:1.2-48-g7421258/BearSSL:6105635
Fatal exception 0(IllegalInstructionCause):
epc1=0x4000dce5, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000

--------------- CUT HERE FOR EXCEPTION DECODER ---------------```

[leaden walrus]

try this:

  Serial.print(adcVal); Serial.print(" | ");
  Serial.print(ADCmin); Serial.print(" | ");
  Serial.println(ADCmax);
  delay(5000);
  int mappedADC = map(adcVal, ADCmin, ADCmax, 0, 1000);
  Serial.println(mappedADC);

see if you can see that serial output before the 5 sec delay

[cold lagoon]

yes:

Exception (6):
epc1=0x40201578 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffe30 end: 3fffffd0 offset: 0150
3fffff80:  3ffe85c8 0000024e 3ffee50c 402010ec
3fffff90:  3ffe87cc 0000001c 00000000 feefeffe  
3fffffa0:  3fffdad0 00000000 3ffee560 3ffee58c
3fffffb0:  3fffdad0 00000000 3ffee560 40201b00
3fffffc0:  feefeffe feefeffe 3fffdab0 40100d55  
<<<stack<<<

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

 ets Jan  8 2013,rst cause:2, boot mode:(3,7)

load 0x4010f000, len 3424, room 16
tail 0
chksum 0x2e
load 0x3fff20b8, len 40, room 8
tail 0
chksum 0x2b
csum 0x2b
v00041fd0
~ld
��␃�␛�n�{��o|�␄l␄�␌d`␂␜c�␓␃␌�<␃s�␂d�g�␌�'�␀␌d`␃��s�l�$␓�␌␌␄�590 | 590 | 590```

[leaden walrus]

no serial prints prior to the crash dump?

[cold lagoon]

there was serial code before, i just cut it out cleanly and wrong 😄

[leaden walrus]

did you see this output?

  Serial.print(adcVal); Serial.print(" | ");
  Serial.print(ADCmin); Serial.print(" | ");
  Serial.println(ADCmax);

[cold lagoon]

yes the last line in here

[leaden walrus]

oh. very last stuff. after the gibberish.

[cold lagoon]

and i think i founmd the problem it doesnt like having the same numbers in min and max. and on the first run trough the loop they are the same

[leaden walrus]

what happens next? after this line?

��␃�␛�n�{��o|�␄l␄�␌d`␂␜c�␓␃␌�<␃s�␂d�g�␌�'�␀␌d`␃��s�l�$␓�␌␌␄�590 | 590 | 590

[cold lagoon]

it reboots and starts at this line --------------- CUT HERE FOR EXCEPTION DECODER ---------------

[leaden walrus]

ok, next try this (just commnets out two lines):

  Serial.print(adcVal); Serial.print(" | ");
  Serial.print(ADCmin); Serial.print(" | ");
  Serial.println(ADCmax);
  delay(5000);
  //int mappedADC = map(adcVal, ADCmin, ADCmax, 0, 1000);
  //Serial.println(mappedADC);

no other changes

[cold lagoon]

that would work (already tryed before posting here)

but i got it working with this code c++ void loop() { int adcVal = analogRead(adc); if (adcVal >= ADCmax){ ADCmax = adcVal; } if(adcVal <= ADCmin){ ADCmin = adcVal; } if(ADCmax == ADCmin){ ADCmax = ADCmax + 1; } int mappedADC = map(adcVal, ADCmax, 100, 0, 100); Serial.println(mappedADC); delay(25); }

[leaden walrus]

guessing a divide by zero in map when values are same

int mappedADC = map(adcVal, 500, 500, 0, 1000);

does that also crash loop?

[cold lagoon]

nah wait fatal error on my side i messed up the map function xD

[cold lagoon]

that crashes it too yes thats how i got it out

[leaden walrus]

will need to protect against fromLow==fromHigh in your code before calling map()

[cold lagoon]

THIS works now and will be my last code spam in this channel:

void loop() {
  int adcVal = analogRead(adc);
  if (adcVal >= ADCmax){
    ADCmax = adcVal;
  }
  if(adcVal <= ADCmin){
    ADCmin = adcVal;
  }
  if(ADCmax == ADCmin){
    ADCmax = ADCmax + 1;
  }
  int mappedADC = map(adcVal, ADCmin, ADCmax, 0, 100);
  Serial.println(mappedADC);
  delay(25);
}```

so just ensure fromLow and fromHigh aren't the same...

[leaden walrus]

yep. ideally, that'd be handled in the implementation of map(), but guess it isn't

Fatal exception 0(IllegalInstructionCause):

divide by zero = illegal instruction

seems fixed?
https://github.com/esp8266/Arduino/issues/2219

are you using the ESP8266 arduino core?

[cold lagoon]

yes, also tried ArduinoIDE

[leaden walrus]

and looks like it throws a different exception

[native dagger]

I'm trying to get wifi working via platform io on the qt py esp 32 s2. 2 questions:

1. on the pinout diagram, how do I know what the arduino pin numbers are?

2. platform io recognizes wifi.h and WiFiAP.h but not NetworkClient.h

Following the wifi access point example on adafruit/arduino-Esp32 on GitHub.

[merry drum]

Real quick question, does the protomatter library support chaining of matrixes yet?

[stable forge]

It supports multiple matrices. Note that the number of address lines needed will increase. We have several multi matrix projects in the Learn Guides

[obsidian knoll]

Is there any reason why multiplying a value by a negative float returned by a function should result in NaN?

i am trying to figure out if this is more esp32 jank or if i am doing something wrong and i cannot tell

float timeToAdd = ((realElapsedTime / 1000.0 / 60.0 / 60.0) * realityMultiplier);

realElapsedTime is an unsigned long. realityMultiplier is a float, equal to 280.

if I add * getScaleFactor() after realityMultiplier, this returns NaN. getScaleFactor returns a float between -3 and 3.

[lethal yarrow]

Well, -0 is technically a thing, though IEEE-754 states that dividing by it should produce -Inf. 0/-0 could result in NaN though.

[obsidian knoll]

sigh float(realElapsedTime) made it work

[lethal yarrow]

Well, what type was realElapsedTime initially?

[obsidian knoll]

unsigned long

i got nan even if everything after it was positive

[lethal yarrow]

You probably just got screwed over by C(++) implicit type conversion rules.

[obsidian knoll]

also

for whatever magical reason

works:

float timeToAdd = blahblahmathfromabove

otherFloatVariable += timeToAdd

doesnt:

otherFloatVariable += blahblahmathfromabove

[lethal yarrow]

Integers can be implicitly converted to floats, but not the other way around.

[obsidian knoll]

the output of the math is 100% a float. i just dont understand why it does this.

[lethal yarrow]

As a general rule though, I recommend avoiding automatic type conversions as much as possible. It is always better to be explicit.

[obsidian knoll]

i end up just slapping everything in a float()

seems.. wildly inefficient?

[north stream]

You could also use cast

[obsidian knoll]

idk exactly how float(); impacts performance but if im casting literally every single thing to it, it seems wrong

(int)thing is casting, right?

is there a difference between (int) thing and int(thing)?

[lethal yarrow]

In C++, there might be. In C, I don't know if the latter will even compile.

[obsidian knoll]

hmm

  simulatedTime += (float)(((float)realElapsedTime / 1000.0 / 60.0 / 60.0) * (float)realityMultiplier * (float)getScaleFactor());

this still returns nan lmfao

[lethal yarrow]

Keep in mind though that a type cast such as (int)thing tells the compiler "treat this value, whatever it is, as if it were an int". No conversion takes place.

[obsidian knoll]

hmmmmm

this is blowing my mind. the function outputs a valid float

but if I use +=, i get a nan.

  unsigned long currentMillis = millis();

  unsigned long realElapsedTime = currentMillis - lastClockUpdateTime;

  float timeToAdd = ((float(realElapsedTime) / 1000.0 / 60.0 / 60.0) * realityMultiplier * getScaleFactor());

  simulatedTime += timeToAdd;

  Serial.println(timeToAdd, 10);
  Serial.println(simulatedTime, 10);

i dont understand how its possible

[lethal yarrow]

simulatedTime is a float?

[obsidian knoll]

i even tried

  simulatedTime = simulatedTime + timeToAdd;

[stable forge]

float(realElapsedTime) is not a cast. Do ((float) realElapsedTime)

[obsidian knoll]

yes

[stable forge]

I'm not sure what float() is going to do`

[obsidian knoll]

https://www.arduino.cc/reference/en/language/variables/conversion/floatcast/

got it from here

ill try cast

float simulatedTime = 0.0;
unsigned long lastClockUpdateTime = 0;

void updateClock() {

  delay(100);

  unsigned long currentMillis = millis();

  unsigned long realElapsedTime = currentMillis - lastClockUpdateTime;

  float timeToAdd = (((float)realElapsedTime / 1000.0 / 60.0 / 60.0) * realityMultiplier * getScaleFactor());

  simulatedTime = simulatedTime + timeToAdd;

  Serial.println(timeToAdd, 10);
  Serial.println(simulatedTime, 10);

  lastClockUpdateTime = currentMillis;a
}

[lethal yarrow]

Looks like it may just be a preprocessor macro.

[obsidian knoll]

first .ino file, outside of loop

loop calls updateClock

added more context

i truly do not understand what is happening here. a float can hold negative numbers, and numbers (either sign) can be added to floats, right?

[stable forge]

could you upload your whole sketch, using the + on the left? There is some copy-pasta in there (stray a, for instance).

[obsidian knoll]

unfortunately there is a ton of pii in it

lemme write up a simpler version

one moment :) thanks for the help

[lethal yarrow]

Why are you using floats here?

[obsidian knoll]

simulatedTime is decimal hours

6.5 = 6:30

i am calculating decimal hours to increment the clock with.

[lethal yarrow]

That's... not a good way to represent time. The "traditional" means of representing times in C is to either use a ctime_s struct or UNIX timestamps.
https://en.cppreference.com/w/c/chrono/ctime

[obsidian knoll]

trust me, i know.

it is difficult to get people who do not understand what a unix timestamp is to understand why it is better lol

this is just acting as a master clock for a couple of sculptures to sync off of. there is no need for actual timekeeping.

[lethal yarrow]

In your case, I would probably just create a struct to hold the hours and seconds separately. It will be much more efficient than dealing with floating point decimal hours.

[obsidian knoll]

i know

a bunch of other people need to be able to do simple maps based on this

one single float is much easier

this is not how i would do it if it was just me :)

sigh putting the code in another sketch to send here has made it work in that other sketch only

[lethal yarrow]

The map function is not guaranteed to function correctly for floats. Here is the definition:

long map(long x, long in_min, long in_max, long out_min, long out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

[obsidian knoll]

ah yes

float mapFloatConstrained(float x, float in_min, float in_max, float out_min, float out_max) {
  return constrain(((x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min), out_min, out_max);
}

my func

so, it appears that the issue is somewhere in this.

float getScaleFactor() {

  float potVoltage = leverPot.readVoltage();

  if (potVoltage < potMin) {
    potMin = potVoltage;
  }

  if (potVoltage > potMax) {
    potMax = potVoltage;
  }

  float scaleFactor = mapFloatConstrained(potVoltage, potMin, potMax, scaleFactorMin, scaleFactorMax);

  scaleFactor = -2.0;

  return scaleFactor;
}

setting scaleFactor to -2.0 manually works. so something is wrong with my map. ugh.

[lethal yarrow]

Because of the way the constrain() function is implemented, avoid using other functions inside the brackets, it may lead to incorrect results.
Wait—what? Ugh the ardunio api is such a mess.

[obsidian knoll]

sorry. what.

[lethal yarrow]

https://www.arduino.cc/reference/en/language/functions/math/constrain/

[obsidian knoll]

..... wack, i will remove the constrain

nope still nan.

i dont understand, man.

float mapFloatConstrained(float x, float in_min, float in_max, float out_min, float out_max) {
  return ((x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min);
}

[lethal yarrow]

I honestly don't know what they were thinking when they implemented that.

[obsidian knoll]

this works great. i get output, works fine

but why does it error when i add the output of that to another float?

[lethal yarrow]

Could be due to the float implementation for ESP32. I don't really have time to try digging that up though.

[obsidian knoll]

esp32 is such a nightmare.

it is again working in this other sketch but not in the main sketch. what

is there another datatype i can try?

i have been trying to add two floats together for over 24hrs now 😭 lmfao

[lethal yarrow]

I don't believe any variant of the ESP32 has a hardware FPU, and I wouldn't count on the software implementation being well-tested.

[lethal yarrow]

How precisely do you need to measure the time? And how long of a duration do you need to keep track of?

[obsidian knoll]

not precisely at all.

[lethal yarrow]

Like, minutes?

[obsidian knoll]

  float timeToAdd = (((float)realElapsedTime / 1000.0 / 60.0 / 60.0) * realityMultiplier * getScaleFactor());

  float testVariable = simulatedTime + timeToAdd;

  simulatedTime = testVariable;

  Serial.println(timeToAdd, 10);
  Serial.println(testVariable, 10);
  Serial.println(simulatedTime, 10);

this still returns nan!!!

so there is no way to add two floats together in esp32!!!

unbelievable.

[lethal yarrow]

If I were to guess, I'd say that the results of some of the float operations are not being normalized.

[obsidian knoll]

i can try rounding?

is there a function to round to a certain number of decimal places?

[lethal yarrow]

My recommendation though would be to just use an int to hold a number of minutes.

[obsidian knoll]

yeah, that is sane

[lethal yarrow]

Sort of. The actual number of actual decimal places represented depends on the float type, and keep in mind that this is binary floating point. The decimal representations are approximate.

[craggy tusk]

tips on soldering normally i just put solder on soldering gun then apply paste on the holes on the board which i soldered

[obsidian knoll]

i am going to try some horrific jank

[lethal yarrow]

To get hours, divide by 60.

[obsidian knoll]

i have a terrible, terrible idea

[lethal yarrow]

Use the correct channel please. #help-with-projects would be more appropriate.

[lethal yarrow]

For minutes, mod by 60.

hours = time / 60;
mins = time % 60;

^ this will be the easiest (and likely most efficient) approach in your use case, assuming you only need 1 minute resolution.

If you represent time in seconds, you would do something like

hours = time / 3600;
mins = (time / 60) % 60;
secs = time % 60;

@obsidian knoll hopefully that helps.

[obsidian knoll]

yeah i know how to implement it like that

this use case is just weird

i just am trying to understand how you cant add two floats together on an esp32. mind boggling.

i am trying to convert the floats to ints and then back to floats to try to unf*ck them somehow idk

[lethal yarrow]

That will result in a loss of precision.

[leaden walrus]

void setup() {
  Serial.begin(9600);

  float a = 23.42;
  float b = 42.23;

  float c = a + b;

  Serial.print("a="); Serial.println(a);
  Serial.print("b="); Serial.println(b);
  Serial.print("c="); Serial.println(c);
}

void loop() {
}

[lethal yarrow]

Converting a float to an int will cut off any fractional components.

[leaden walrus]

a=23.42
b=42.23
c=65.65

[obsidian knoll]

yes, i am multiplying the float by 100, casting to int, then dividing by 100 to get back to a float

i cant afford to rewrite all of this in minutes

it would take me two days lol

[lethal yarrow]

That will still result in data loss.

[obsidian knoll]

yes it doesnt really matter

i am just trying to add two floats together lol, if this is how i have to do it, so be it

[stable forge]

if you could come up with a small example that generates NaN (apparently incorrectly) that woudl be great, that could then be tested.

[obsidian knoll]

yeah i am trying to pull out the parts that are causing the error so i can send them. there is a ton of pii in the sketch.

i am probably going to give up and rewrite it using integer seconds or something. just mind blowing

i fail to understand how it is ok to release a microcontroller that cannot handle adding floats together. its truly stunning. i have never had these issues on stm32 or any 8bit mcu

[lethal yarrow]

Unfortunately this doesn't really help for a few reasons:

1. Since the values of both operands are known at compile time, the value of c will likely be computed during compilation.
2. The issue appears to be related to the implementation of some floating point operations on the ESP32 specifically.

[obsidian knoll]

exactly

hardcoding the float works fine

[lethal yarrow]

Uhh... it's cheap. And Espressif isn't really known for having good quality control. That's part of the reason there are so many variants of it.

[leaden walrus]

yah, sry, seems like a lot of context here i'm behind on. i was just answering the question about "adding two floats" and it "not working" on ESP32. other than precision and trunc issues, etc. (nothing ESP32 specific), it should just work.

[obsidian knoll]

that is the maddening thing

[stable forge]

that is why I am interested in a small example; we can file a bug report with Espressif

[obsidian knoll]

the only way i can trigger the error is via my original sketch somehow

generating a float like this int randomNumber = random(1,500); float randomFloat = randomNumber / 100.0; does not cause the error

[lethal yarrow]

Fully debugging this issue will likely involve disassembling the sketch and tracking down exactly what operations are being performed to get each intermediate result with inputs that are known to be problematic.

[obsidian knoll]

is there some way to "clean" a number? idk any other way to say it, take my floats which seems to be problematic and pass them through some function to get new clean memory locations or something

i tried making new variables and setting them equal to the problematic variables, doesnt work, i assume compiler optimizes it

[lethal yarrow]

For floats, this is called normalization. This is generally done automatically in hardware implementations.

[lethal yarrow]

That's likely.

Not sure if there's a way to pass -O0 (disable optimization) to the compiler in arduino.

[obsidian knoll]

tried setting the vars to volatile, did nothing

[stable forge]

i would still like to see the (redacted) sketch, because this may be a problem with the sketch. What version of ESP32 Arduino are you using?

[obsidian knoll]

will try using double

[obsidian knoll]

latest core as far as i can tell

[stable forge]

v2 or v3

[obsidian knoll]

the sketch with my pii removed works fine.

which is maddening because nothing interacts

[stable forge]

what pii are we talking about? your SSID and password?

[lethal yarrow]

Depending on the implementation, those may actually be the same type.

[obsidian knoll]

loads. i almost have a redacted copy

it also requires a mqtt connection

i am disabling all that

[stable forge]

for instance, if something is going on in the background, the stack or the static variables may be getting smashed

that would have nothing to do with float problems

[obsidian knoll]

you will need an esp32 and a pot

almost done

[lethal yarrow]

Possible, though if that were the case I would expect to see a lot more corruption.

[obsidian knoll]

there really just isnt a way to share this in a way that is identical

you wont have a mqtt server to talk to so that part will just be disabled

ill see if that affects anything

tbh i think its just going to be easier to rewrite in seconds and then convert that to decimal hours for sharing

baffling

if you want to screw with it, here it is

you need:
ArduinoMqttClient
Glue by hex705
ESP32AnalogRead

esp32, pot, with pot wiper on A2

wifi and mqtt is disabled, but the error still occurs.

[stable forge]

SunCycle.ino is the only sketch that matters, is that right? and need secrets.h

[obsidian knoll]

Excuse the amount of jank in there, I've been trying to fix this for over 24hrs

[stable forge]

clock.ino and mqtt.ino and wifi.ino not relevant?

[obsidian knoll]

The problem is in clock.ino. I think. Who knows at this point

There are functions across it that will break if you remove any file

I disabled everything that won't work for you. You can flash it as-is and it should error the same as I see it. You don't need a wifi connection or anything. It outputs to serial.

I'm using Arduino IDE, latest.

Standard esp32. I'm using an adafruit feather, the base one.

[stable forge]

plain esp32, not esp32-s2? ESP32 V2 or Huzzah32?

[obsidian knoll]

Sorry - huzzah32. The adafruit one w/ battery connector. Let me find the exact markings

Huzzah32. Has esp32-wroom32-32e.

[stable forge]

what version of esp32 BSP is installed, e.g. on mine:

[obsidian knoll]

One moment

[stable forge]

i don't see Glue.h

[obsidian knoll]

Yes it's a library

[stable forge]

ok, will look for it

[obsidian knoll]

There are 3 that you need

They're all in the package manager thingy

[stable forge]

ok, i'm succeeding compiling now

tnx

ok reproduced your error

[obsidian knoll]

Interesting - so it isn't my hardware

[stable forge]

i'm using same feather

[obsidian knoll]

Thanks for looking into it and again sorry for the jank in there 😅

[stable forge]

ok, the first-level problem is that getScaleFactor() returns NaN the first time it is called.

that makes timeToAdd be NaN and contaminates simulatedTime as NaN

[obsidian knoll]

Brutal

And so once it's nan, adding anything to nan is nan.

So I guess, sorry for slandering you esp32, i am the problem actually 😆

[stable forge]

looks like mapFloatConstrained is doing something wrong. On the first call only:

potVoltage: 0.43
potMin: 0.43
potMax: 0.43
scaleFactorMin: -3.00
scaleFactorMax: 3.00
returning scaleFactor: nan
nan

[obsidian knoll]

i think there is a divide by 0 somewhere

[stable forge]

yes, probably

[obsidian knoll]

argh

[stable forge]

float mapFloatConstrained(float x, float in_min, float in_max, float out_min, float out_max) {
  return ((x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min);
}

[obsidian knoll]

hmm

[stable forge]

in_max == in_min so it will divide by zero

(out_max - out_min) / (in_max - in_min)

ok, i think it's in back in your court 🙂

[obsidian knoll]

wack. lol

@stable forge i assumed that constraining the output of that would result in a number of some kind, but i guess that was wrong

[stable forge]

the problem is that the first time around in_min and in_max are the same, because it's the first value

[obsidian knoll]

ie constrain(nan, -3, 3); would give... a number.. but clearly that isnt right because which number would it output? there is no way for it to magically pick one

[stable forge]

and if the pot stays the same, the min and max will still be the same

didn't we already have a discussion yesterday about trying to dynamically track this, or was that someone else/

[obsidian knoll]

someone else, i think?

[stable forge]

maybe so

[obsidian knoll]

i changed from two if statements to an if, else if

should stop them from being set to the same

[lethal yarrow]

NaN "carries". For any operation involving a NaN, the result will be another NaN.

[obsidian knoll]

yeah that makes sense logically

[stable forge]

yes, it was someone else, who was also doing map stuff: #help-with-arduino message

NaN is contagious

[leaden walrus]

someone else:
<#help-with-arduino message>

[lethal yarrow]

Oh, and by the way, there are actually two distinct NaN values ("quiet" qNaN and "signalling" sNaN). In practice though not many floating point units treat them differently.

For those wondering: sNaN is meant to raise a hardware exception when used in an operation; qNaN is supposed to be "passed through" operations, with the result being another qNaN

[peak shell]

everything works well...if you want, I can send you the whole code

[obsidian knoll]

how can I test if a variable is nan?

nvm, isnan seems to be a thing

[merry drum]

Thank you!

[pine bramble]

Hey. I have two Adafruit ESP32 Feather v2 but I can't get a sensor (MAX30102) working via stemma qt (on both of them). At the same time the sensor works just fine at the regular SCL and SDA Pins (GPIO 20/22). I measured the voltage from the stemma qt port and it seems just fine 3.3V. I also scanned for the Sensor and it was found by its correct address on the stemma qt port. This is really strange and it seems like its related to this post: https://forums.adafruit.com/viewtopic.php?t=203061 . Unfortunately I couldn't find the follow up post. Do you have an idea what I could do? Thanks in advance

[eternal cloud]

did you do this part?

NEOPIXEL_I2C_POWER is connected on gpio pin 2, you can try to set it to high hardcoding the value, just in case something is not defined right

[pine bramble]

thank you for replying. yes I did:

#include <Wire.h>
#include "MAX30105.h"

MAX30105 particleSensor;

#define debug Serial //Uncomment this line if you're using an Uno or ESP

#define NEOPIXEL_I2C_POWER 2 

void setup()
{
  pinMode(NEOPIXEL_I2C_POWER, OUTPUT);
  digitalWrite(NEOPIXEL_I2C_POWER, HIGH);

  debug.begin(9600);
  debug.println("MAX30105 Basic Readings Example");

  // Initialize sensor
  if (!particleSensor.begin(Wire, I2C_SPEED_STANDARD))
  {
    debug.println("MAX30105 was not found. Please check wiring/power. ");
    while (1);
  }

  particleSensor.setup(); //Configure sensor. Use 6.4mA for LED drive
}

void loop()
{
  debug.print(" IR[");
  debug.print(particleSensor.getRed());
  debug.print("] R[");
  debug.print(particleSensor.getIR());
  debug.print("]");

  debug.println();
}

[eternal cloud]

i see...

[pine bramble]

yeah its strange...

😄

but perhaps you have any tricks up your sleeve?

[eternal cloud]

you could try using it with WipperSnaper, see if with different code it acts the same

[pine bramble]

never used that... I just know how to handle arduino IDE

[eternal cloud]

if the problem persists, it could be hw issue, and you should make your own forum post ... yay! 😅 lol

[pine bramble]

hahahaha ❤️

Thanks a lot Snakey

[eternal cloud]

https://learn.adafruit.com/adafruit-esp32-feather-v2/wippersnapper-setup

it's here in the guide

should be pretty straightforward, it's a no code solution offered by Adafruit on some boards

[pine bramble]

cool

[pine bramble]

hey guys, i made this circuit for the for the UART and I2C communications between arduino uno and raspberry pi zero 2 w and a level shifter (3.3v-5v). now i bought the components and i'm struggling in the wiring as you can see for example there's a wire between sda pins and then another wire from the same pin to the motor shield with a 10k resistance. so my question is how can i enter 2 wires in one?

[pine bramble]

I cut one of the sides of the wire and then enter it in the pin and add another wire in the same pin, is that possible?

[north stream]

Same pin? You're running SDA to the motor shield? Are those 10kΩ resistors supposed to be pull-up resistors?

You can join wires with a small breadboard or something like this: https://www.adafruit.com/product/5616

[fair jasper]

These look awesome! That's why I love this discord... even though I've been through the adafruit store a million times, there's always something you point out that I missed.

[pine bramble]

Due to budget issues and availability in my country, can you tell me how to use a breadboard? I’m running SDA and SDL to the arduino with Pull up resistors of 10k attached to the 5v pins of the motor shield cause I asked and they told me that the pins of 5v in the motor shield are the same as the 5v pin of the Arduino if they’re attached

[eternal cloud]

I'm not sure I understand what you are trying to do here.
SDA and SCL are the data communication pins for an I2C connection, you do **not **want them connected to 5V, they need to go to the SDA and SCL pins on the shield.

Also, the shield is designed to plug in on top of the Arduino, so that would simplify your wiring , and match the correct pins to each other

Your circuit diagram is not labeled, and it's very difficult to read ... what is that small board in between the arduino and the pi ?

[pine bramble]

The small board is a level shifter from 3.3v to 5v.
I of course connected the SDA/SDL from the arduino to the raspberry. I’m designing the circuit with the “Cirkit” application and it has an AI inside to help wiring so it said that I have to add two 10k resistance from the arduino to the 5v power of the arduino and they should be connected with the SDA/SDL to make it more secure and help with the noise sound

[eternal cloud]

The Arduino I2C data SCL and SDA pins should definitely **not **be wired to a 5V pin.
Also, your motor shield does not get any proper power, and its data lines are not connected, so it doesn't do anything.

The logic level shifter seems to also do nothing, since you connect the data lines both through the shifter, and directly between pins.
And if you want to communicate between raspberry pi and arduino, you're better off using UART serial, easier than to implement the I2C host - peripheral protocol

[undone mortar]

I have setup an Arduino redboard as an I2C slave for RPI4B running UBUNTU and ROS 1. However the raspberry pi is not reading any i2c connection.

[pine bramble]

I have other components that use I2C communication in raspberry like OLED Display

And why does the level shifter don’t do anything?

Isn’t it supposed to shift levels between the two components since one of them use 3.3v and other 5v?

[cold lagoon]

Hi. Im using an RP2040 with the earlephilhower core and arduino framework (programming with PlatformIO) for a DIY Keyboard. It uses the built in Keyboard.h library, which sadly is for US Keyboards. Is there a way to switch to a German layout?

[eternal cloud]

yes, just use the included german layout 😛 https://www.arduino.cc/reference/en/language/functions/usb/keyboard/keyboardbegin/

[cold lagoon]

Well that was simple lol. Here it said you have to include it somehow 🤷‍♂️ https://www.arduino.cc/reference/en/language/functions/usb/keyboard/keyboardmodifiers/ (bottom of the page). But just declaring it works Thanks

[eternal cloud]

I think this link might be from an older / different version of the library, where you had to include the extra layouts by hand 🤷‍♀️

Anyway, seems way easier now, glad it works! 🙂

[frozen crescent]

https://github.com/search?q=randomSeed(micros())&type=code

I wonder why are so many using micros() on ESP8266 and ESP32 when RANDOM_REG32 and similar exist? Scary.

[faint summit]

i'm trying to use an esp32 to dump the contents of a spi flash chip, but i can't seem to find any tutorials on how to raw read an spi flash, any help?

[eternal cloud]

Depending on what flash chip you have, you could use this library https://github.com/adafruit/Adafruit_SPIFlash/
Check out the examples folder for usage, I'm not aware of a tutorial that explains this specifically.

[faint summit]

I have a 25q128a chip which i think adafruit sells as well

I'll thank a look thx

[silk geyser]

I am using a esp32 s3 devkit C with a capacitive touch screen. I'm running to issue where the esp32 restarts everything I try to connect to Wifi; Wifi.begin(SSID, PWD)

It seems to me to be a power issue because it doesn't seem to be a crash. The screen turns off, supposedly to lack of power. I am currently powering it using my macbook air's usb-c port (it should be able to give 3 amps). I've also tried powering it with a usb wall adapter. Still, nothing works.

I measured that the display uses about 0.5 amps. I'm not sure what to do here, does anyone know of a way to power it so it could handle Wifi+LCD?

Thanks in advance!

Btw, both the LCD and the wifi work indivisually

[stable forge]

that is a lot for a display. The port may not be capable of 3A at 5V. Can you power the display with the separate wall adapter? Just tie the grounds together. Don't cross-connect the +5V lines

[silk geyser]

hmm, i just tried this, but it seems that all communication (including serial) just stops until i disconnect the gnd from the esp32

[stable forge]

could you say which display you are using and show a picture or diagram of the wiring?

[wise forum]

Hello guys and gals. Where is the proper place to announce Arduino library?

I've implemented writing to LED stripe WS2812B (C with gnu asm huh) but don't see good place to announce it and get feedback.

[silk geyser]

sure
The display is https://www.amazon.com/Hosyond-320x480-Capacitive-ST7796U-Mega2560/dp/B0CMD7Y55M, which I'm driving using the Adafruit_GFX library

Wiring:
Display | Device | External Power
VCC _ 3v3
GND GND GND
LCD_CS 10
LCD_RST RST
LCD_RS 8
LCD_MOSI BUILTIN_MOSI
LCD_SCK BUILTIN_SCK
LCD_MISO BUILTIN_MISO
CTP_SCL 39
CTP_RST 38
CTP_SDA 37
CTP_INT 36

[stable forge]

Try driving this with 5v, not 3.3V. I think you are overloading the 3.3V regulator on the devkit board.

[silk geyser]

hmm

lemme try

[stable forge]

There already are such libraries: https://github.com/adafruit/Adafruit_NeoPixel for one

[silk geyser]

tried it, but the display didn't get turned on

just measured and it seems that the 5v pin is outputting less than 2v, whereas the 3v3 is outputting a solid 3.3v

[stable forge]

which is the 5v pin?

I have that board, I think

https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/_images/ESP32-S3_DevKitC-1_pinlayout_v1.1.jpg

lower left, one up

[silk geyser]

yup, thats the one

i think the 3v3 regulator is signitifcantly lowering the current to get the voltage up to 3 volts

so that is why its not getting enough current

and given that the 5v pin is outputing 2v, i think thats how much the board is being supplied

i've got no idea why

i was using a usb hub, but now im using a direct usb-c to usb-c cable

[stable forge]

that doesn't make sense. the 3.3v regulator is not a buck boost

[silk geyser]

🤷‍♂️

[stable forge]

I will be back in 45 minutes or so

[silk geyser]

alr

[stable forge]

Looking at the schematic, the 5v pin from either USB connector goes through a diode to the 5V pin. Could you measure that again? On mine, I had to press a little harder to get a good reading on the 5v pin. I see 4.7V because of the Schottky diodes that select the higher of the two USB voltages.

[stable forge]

you might want to announce it in the Arduino forums if you think it's an improvement over the existing libraries.

[wise forum]

Hello danh,

1. Arduino forums are overloaded with themes. If they split it in categories like "help me!1", "library announces" and "help with specific library" it would be a lot easier for everyone. There are no better places than Arduino's forums? (Ideally, a maillist for other developers.)
2. I wrote it for myself and don't try to force everyone to use it. But I want it be reachable for everyone who wishes.
3. Yeah. Adafruit's Neopixel. Just 3.5k lines of code. Still a lot better reading than FastLED. My code is here for reference: https://github.com/martin-eden/arduino_sketchbook/blob/master/libraries/me_Ws2812b/src/me_Ws2812b.cpp

[leaden walrus]

@wise forum info on registering a library is here:
https://github.com/arduino/library-registry

[eternal cloud]

Coming to Adafruit discord to insult their code, and in the same breath demand of their employees that they promote your code instead, because it's ... shorter? lmao

[pine bramble]

Hey 🙂 Is there an alternative way to make the HUZZAH32 a MIDI device which can send via USB? I can't get the Adafruit_TinyUSB.h to work. I've also tried MIDI Library by Francois Best.

[eternal cloud]

The esp32 chip does not have native USB support, so I'm not sure you can have MIDI over USB, only UART or BLE.
This wing might be helpful: https://learn.adafruit.com/adafruit-midi-featherwing

[pine bramble]

Thank you so much👍

[wise forum]

Thank you.

[narrow iron]

I have two USB peripherals and I want them to talk to each other using the RP2040 USB Host. I'd like to use the USB A and USB C ports and not hard wire to the GPIOs.

Both of the devices do not supply 5VDC - so I'll be using a 3.7V batt on the RP2040 JST

I want the USB C port to be the host.

There is an example sketch in Arduino IDE called "serial_host_bridge" I think this is a good starting point, but I can't seem to get it to work.

Thoughts? Is what I'm describing above possible?

[wise forum]

I came here to ask advice for good place to announce library. For example there is maillist for Lua. I thought there should be something similar for Arduino or Esplora. No offence to Adafruit, I appreciate their work on unifying sensors. Just a bit allergic to arguments "it's already done" (assuming it's taboo now).

[wise forum]

If there is related example then most likely it's possible.

[eternal cloud]

Are you using the Adafruit USB host feather ? https://www.adafruit.com/product/5723

Only the USB A can be host on this board

[wise forum]

It's demagogy. You are making false assertions what opponent said and then critique them. 3k lines source file is design smell for me. But it's out of scope. Regarding my question of place to announce new implementation I've got recommendation of Arduino's forum and link about adding lib to official repo. Let's close this discussion.

[narrow iron]

Yes, using the USB host feather... got it, only USB A can be host.... TY!

[timid tapir]

Hi all, I'm having some trouble getting an ssd1331 display up and running on my esp32 dev board (cp2102)

1. Im using the adruino IDE
2. I'm using the Adafruit_SSD1331 library (and I have adafruit_gfx lib installed as well)
3. The code I'm trying to upload is just the the built-in example LCDGFX demo code

Pinout below:
SD1331 Pin ESP32
1 GND -> esp32 GND
2 VCC -> esp32 3.3v
3 SCL -> GPIO14
4 SDA -> GPIO13
5 RES -> GPIO15
6 DC -> GPIO05
7 CS -> GPIO04

Code uploads completely fine, but my display does not come on. I just don't have a fundamental understanding of where each pin should be given my esp32 is different than the esp8266 documented in the code. I presumed they should be the same but I'm not sure

[eternal cloud]

What ESP32 board are you using ? The pins are most likely not the same, you need to check the board documentation.

[timid tapir]

I think its just a generic esp32 dev. Its made by AITRIP ESP-WROOM-32. I bought that one because I liked the convenience of the usbc. I've ran all my other sketches with it fine

I see that it says 4x SPI pins but I see VSPI and HSPI totalling to 8?

[timid tapir]

See above

[eternal cloud]

Yes, it has multiple SPI ports, you need to choose one and use its pins

like V mosi would be gpio23 and v sck gpio 18

#define mosi 13
#define cs   5
#define rst  9
#define dc   6```
do you have this in the example code you're trying to run ?

[timid tapir]

But what does that correspond to on the display unit?

[timid tapir]

yep its this one

[eternal cloud]

you need to connect the oled over an SPI connection , so sclk would be gpio18 for you, and mosi gpio23

chip select cs , reset rst and data dc are defined by you, how you connected the oled

they can be any digital pins

[timid tapir]

So SCL from the oled goes to GPIO18? (VSPI_SCK)

[eternal cloud]

oh, wait, oled is on I2C ?
post a pic, please ?

[eternal cloud]

ok, i see ...
so SCL on oled should go to vspi_sck gpio18 yes
SDA to gpio23 vspi_mosi

[timid tapir]

Got it let me try that

do I change the code?

[eternal cloud]

only the definitions

[timid tapir]

yeah thats what i meant ok

[eternal cloud]

You might have to change the display init too, since it's using the default "&SPI" and I don't think this board has a default value
Adafruit_SSD1331 display = Adafruit_SSD1331(cs, dc, mosi, sclk, rst);
should work

[timid tapir]

Okay so display works but is showing some mess so Ill try that new init

Okay seems to work!

[eternal cloud]

Yay! 🙂

[timid tapir]

there's something funky going on with the refresh though

[eternal cloud]

If you're on a breadboard, make sure your connections are stable ... other than that, I'm not sure 😅

[timid tapir]

Could be the code cause at some point it becomes butter smooth and then back to some weirdness

Okay well now for the explanation part. How did you know that SCL is for the VSPI_SCK and SDA for VSPI_MOSI?

[eternal cloud]

I was looking in the library examples https://github.com/adafruit/Adafruit-SSD1331-OLED-Driver-Library-for-Arduino/tree/master/examples and they always label SDA-MOSI and SCL-SCK in code

I'm still not sure why these oleds come labeled with I2C names when they actually use SPI interface, but ... 🤷‍♀️

[timid tapir]

Got it okay. I was just confused because code for me says SCLK and I had no itea SCLK and SCK is the same. Furthermore there is an HSPI_MOSI and HSPI_SCK so how did you know it wasnt those spi but vspi?

[eternal cloud]

oh, you can use HSPI if you want, like i said, you just need to pick one ... like you can't use mosi from H and clock from V

ESP32 chips have multiple SPI interfaces, and on your board, the pins are exposed for 2 of them ... so you choose which one to use

[timid tapir]

Theres no difference between H/V?

[eternal cloud]

nope

[timid tapir]

Okay I will try it see if there's any visual diff

Yup no difference as expected

Thank you for the assistance

[timid tapir]

Does this affect performance though? Maybe I can define the &SPI so that it can run faster?

The display init we using rn is just the init for any pins

Or does it not matter because we are hooked up to the hardware spi pins

[eternal cloud]

it might ... you can declare an SPI object if you want and use that one in the init

[timid tapir]

Is there a way i can simply modify the existing SPI class?

[eternal cloud]

you just need to add your SPI pins as parameters in a SPI.begin( ); call

i just don't remember in what order 🤔

[timid tapir]

Cool ill try both thank you once again. If I may ask where you found that?

It seems like I must populate all 4 fields

But it doesnt work. Am I calling it in the right place?

[eternal cloud]

well, miso is not used for oled communication , but just take the pin name from the pinout (it doesn't matter if it's not connected) , and ss is your cs

and you should call it before the display init , just remember to swap back to &SPI

possibly need to do a pinMode (cs, OUTPUT); before SPI.begin()

[timid tapir]

I just want to double check, CS in my case is set with #define to 19. We pass that in
Adafruit_SSD1331 display = Adafruit_SSD1331(&SPI, cs, dc, rst);
and then in the setup

pinMode(19, OUTPUT);
SPI.begin(18, -1, 23, 19);

yeah unfortunately doesnt work

[timid tapir]

Seems like the SPI.begin() function already sets all the pinmodes and such as per documentation

Or that may be the wrong one since it takes no parameters 😂

[eternal cloud]

you chose cs = 19 which is exactly the miso pin for vspi 😅

[timid tapir]

Okay yes. I was aware of that but figured it was okay since i set it to -1 (unused) in the code?

Shall i try a diff pin for cs/ss

[eternal cloud]

i think you need to specify the correct one to init the spi

[timid tapir]

Yeah I dont think SPI class works with esp32

I even tried using GPIO5 which is the natvie VSPI_SS pin

[wise forum]

Keep in mind that ESP boards has different pin numbering.

For example pin labeled "3" on Uno has code value 3. For esplora it's different integer and you may use "D3" to get it's value for your code.

[eternal cloud]

VSPI seems to be the default SPI on esp32 in arduino, so the example code should work with &SPI
https://github.com/espressif/arduino-esp32/blob/master/libraries/SPI/examples/SPI_Multiple_Buses/SPI_Multiple_Buses.ino

[timid tapir]

Yep I was aware of that I just would have never known that I need to connect the SCL and SDA pins of the display to the MOSI and SCK of the esp32

[timid tapir]

So that would be gpio18 & gpio 23 in my case yes?

[eternal cloud]

yep , 18 and 23

[crisp hinge]

Hi, what could cause such things? My code? It's rare and random.

[lethal yarrow]

More likely either a brownout or data corruption on the control bus.

[tardy iron]

can you provide more details about the circuit and wiring? are you using parallel communication, or going through an I2C "backpack" etc?

[crisp hinge]

^here is the circuit

with flyback added

[crisp hinge]

using I2C

[crisp hinge]

"data corruption on the control bus" can be due to my code?

[lethal yarrow]

No. It would be due to your wiring, or the environment you are running it in.

[tardy iron]

the default character ROMs for a lot of those have some kana in the upper half of the space, so something that flips the high bits could produce that

also, there's a maximum speed that they'll accept input. ideally, the I2C module slows down its output to accommodate that, but going too fast is another possible source of corruption

[tardy iron]

i guess you could try adding delays between characters to see if that helps?

[crisp hinge]

what do you mean by "delays between characters" ? I don't understand

[timid tapir]

Don't know why but it doesnt work

[tame pollen]

Would this be enough for powering a car that would use an Arduino Nano ESP32 as guidance computer with 2x DC motors and an ultrasonic sensor?

[north stream]

Perhaps. It depends on how much power the motors draw, what type of AA cells you use, and how much runtime you need. Note that it will provide from about 7 to about 9 volts, so you may need some circuitry to regulate that down to whatever power supply voltage your Nano wants.

[frozen crescent]

No, voltage drop when you start your motors will cause your ESP to brown out.

You need a buck-boost converter in the middle and even then AA-s don't store that much energy. If you can use a battery bank, that'd work better.

[tame pollen]

Got it ty

[vivid rock]

depends on the motors.
I have done quite a few robots that use 4AA batteries as power source, no problems

[vivid rock]

what motors do you plan to use?

[tame pollen]

These two

[vivid rock]

this is not very helpful, as there is no info about voltage and stall current.
but if they are of same type as the motors here:
https://www.adafruit.com/product/711
then the stall current is 500 mA per motor. Good quality rechargable NiMh AA battery should be able to handle.
Still, using a 2-cell Lipo is probably a better choice.

[frozen crescent]

I've tried something very very similar and it just wasn't reliable. The very least a buck-boost converter would be required.

[vivid rock]

well, it worked fine for me.
certainly a buck converter is needed to bring 9v down to something more reasonable to feed to the LDO on the board, but I didn't need a boost

plus, of course, a bulk capacitor (I used two 330uF)

but indeed, LiPo is much better choice

[tame pollen]

Okay thank you

[timid tapir]

On that topic of powering your project with LiPos how can I implement that sort of battery/bms which will charge over the usb on my esp32? Or would it be way easier to just buy another board like this one which has this battery connector and charging capabilities built in?

https://learn.adafruit.com/adafruit-huzzah32-esp32-feather/power-management

[wanton sedge]

You could look at the PowerBoost 500/1000 (500mA vs 1A charge rates) - this has all the protection needed for a single cell LiPo. But yeah personal preference, could also get a board that has similar built in.

PowerBoost 1000 Charger - https://www.adafruit.com/product/2465
PowerBoost 500 Charger - https://www.adafruit.com/product/1944

[crisp hinge]

Would a voltage of 5.5V instead of 5V cause any issues?

As I said, it's random and rare

[eternal cloud]

Again... without details about your components, pictures of your circuit wiring, and possibly posting your code, nobody can say.

[crisp hinge]

I sent a picture of the old wiring, now there is a flyback diode added, that's way better but not enough

it's due to the environment we are running it

[eternal cloud]

That is not your wiring, that is a (hand drawn) schematic.

It's not even clear what microcontroller you're using, never mind other components, and you never changed the -12V, like dan said.

[crisp hinge]

I'm not the one who draw it, that's why it did't changed. We are using a TTGO LoRa32

[eternal cloud]

Ok. But that schematic is still almost irrelevant (**AND **incorrect).
Without pictures and details of your actual circuit, nobody can check and tell you what could be wrong with your actual circuit.

[crisp hinge]

Ok, but is it necessary to answer to this question ?

Would a voltage of 5.5V instead of 5V cause any issues?

[eternal cloud]

**Yes **

[north stream]

All the Feathers (including that one) have charging capabilities built in.

[north stream]

You may need to add some power filtering/decoupling and/or shielding, depending on whether the problem is conducted or radiated.

[timid tapir]

Thanks! Do you know if I would I be able to charge the battery via the esp32 usb port with those powerboosters? (I want a single port to both charge and edit the bin if needed)

[timid tapir]

Yup I got that which is why I wish I knew about it earlier cause it’s nice to have all that built-in

[eternal cloud]

No, both of those charge the battery from their input usb connection, and boost the lipo voltage to provide 5 V output

[eternal cloud]

There is also this charger (NOT a booster) https://learn.adafruit.com/adafruit-microlipo-and-minilipo-battery-chargers/pinouts
that you could use with a custom made usb plug to extend the usb data lines from the charger to your board, but this is kinda hacky and wouldn't recommend it unless you know what you're doing 😅

[haughty plover]

can please anyone tell me how i can do this https://youtu.be/WBE8IZFu55Q?si=GcFO2DWD9xIrT_B9 ?

[gilded swift]

Please don’t post in multiple channels, pick one place and let someone respond.

[haughty plover]

ok sorry

[gilded swift]

It’ll take time as basically everyone here is a community member and helping when they have time. Rest assured though, with that being an Adafruit project there is probably a learning curve guide to help you

[haughty plover]

ok

[gilded swift]

Oh wait, perhaps it isn’t Adafruit but uses Adafruit stuff

[gilded swift]

This learn guide will help you get started with MIDI and should hopefully give you the basics to get started: https://learn.adafruit.com/cpx-midi-controller

[haughty plover]

ok ty

[gilded swift]

Circuitpython will probably be easier to get the basics under your feet first. They appear to use Arduino which might make it more challenging

[limpid drift]

how to get mpython programed with thorney to esp32

[stable forge]

we don't have much experience installing micropython with thonny. See https://randomnerdtutorials.com/getting-started-thonny-micropython-python-ide-esp32-esp8266/ for instance

[magic vine]

i'm using the adafruit st7735 library and i was wondering if it would be possible to manually refresh the display? like draw multiple things and only display when done. currently it draws to the screen after every draw call. im using an esp32-wrover-b that had a micropython firmware pre-installed which let me enable and disable the sync, so i could only refresh manually. does the adafruit library have a function like this?

[frozen crescent]

in general what you want is called vsync, if that's not available you just have to structure your code in a way that does all the draws at the same time

[magic vine]

i am drawing everything at the same time

tft.fillScreen(ST77XX_BLACK);
tft.fillRect(playerX, 0, PADDLE_WIDTH, 4, ST77XX_WHITE);
tft.fillRect(botX, tft.height() - 4, PADDLE_WIDTH, 4, ST77XX_WHITE);
tft.fillRect(ballX - BALL_RADIUS, ballY - BALL_RADIUS, BALL_RADIUS * 2, BALL_RADIUS * 2, ST77XX_WHITE);

if i run fillScreen, that gets drawn to the screen instead of a buffer and waits until its done, then moves to the next function

[magic vine]

https://github.com/vjmuzik/Adafruit_GFX_Buffer i found this library which works perfectly and is what i needed

[mossy fox]

Hi guys,
I'm currently working on a POV display project using DotStar LEDs and the Adafruit_Dotstar class (https://github.com/adafruit/Adafruit_DotStar/blob/master/Adafruit_DotStar.cpp)

I need the fastest possible way to update my Dotstars. I'm using SPI at the maximum freq. of 32 MHz. The thing that takes the most time is the show() function in the Adafruit_DotStar.cpp.

I already changed it to get a bit more speed from it. Changes include:

1. instead of making an SPI transfer() call for each pixel, I calculate every pixel using a buffer and then only do one call of transfer().
2. pre calculating the brightness of the pixels and store everything inside a scaledColors array instead of doing the math inside the show() function.

Using the maximum SPI frequency of 32 MHz gives me a total time of roughly 1ms to call show() on my 128 LED strip.

I was wondering if there is any possible way to get even more speed out of this. I can post the code of my show() method if anyone is interested.
Thanks! 🙂

[fierce phoenix]

(I guess I also ask here about stuff like Bluetooth microcontrollers)
Can you program the adafruit feather m0 for instance to skip ahead in a track by a couple seconds?

And also shuffle the music queue

[north stream]

Uh, probably? It depends on what the source of the music is.

[eternal cloud]

I think you missed the channel, you were over in https://discord.com/channels/327254708534116352/330406777009209346 😛 This is the Arduino channel.
And for most music players, the left and right arrows work as seek through the track, so you can just send HID codes for arrows. For shuffle, you probably need to create a key combination on your computer, and send that from the feather.

[fierce phoenix]

i switched here since i felt like arduino was more appropriate for a microcontroller specific question
and i hope the seek through the track indeed works because it'd wanna stream my music from the fiio r7's own built in music player

just easier to use then windows imo

[eternal cloud]

This channel is for official Arduino boards and / or programming in arduino language

[fierce phoenix]

pardon me if i'm wrong, but wouldn't an arduino microcontroller board be the best option for programming a device to add media controls to said device

[eternal cloud]

Arduino is a company.
They make microcontroller boards (like the Uno, Leonardo, etc, I'm not up to date with all their products)
and also developed a programming language - and were very "helpful" with naming it Arduino as well 🤣

Not all microcontroller boards are Arduino (see above the Adafruit feather m0)

And I was under the impression that you wanted to code in CircuitPython (i might be wrong 🤷🏻‍♀️)

[fierce phoenix]

oohh makes sense

[fierce phoenix]

and i hosently don't know, i'll probably just buy the cheapest and see from there on

[stable forge]

Buying the cheapest thing often means you spend more time getting it to work. Consider that. If you want to try CircuitPython buy a CircuitPython-compatible board.

Before buying, ask for feedback on your choice.

[turbid iris]

Does the adafruit boards package support the new V2 Arduino IDE? If not i'll switch to the older IDE.

[stable forge]

Yes, it's fine, I use the 2.x.x IDE all the time.

[opal turret]

Hi. Is there an alternative way to supply power to this relay that does not involve batteries, but rather a plug-in solution?

[eternal cloud]

That doesn't look like supplying power to the relay, it's connected to the relay outputs.
You can use something like this for a 2.1 plug power supply https://www.adafruit.com/product/368

[opal turret]

Good catch. Thank you very much.

[tame raptor]

#include <DHT.h>
#include <DHT_U.h>

#include <LiquidCrystal_I2C.h>

#include <DHT.h>
#include <DHT_U.h>

#include <dht.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16,2);
dht DHT;
#define DHT11_PIN 4

void setup(){
lcd.begin();
}

void loop()
{
int d = DHT.read11(DHT11_PIN);
lcd.setCursor(0,0);
lcd.print("Temp: ");
lcd.print(DHT.temperature);
lcd.print((char)223);
lcd.print("C");
lcd.setCursor(0,1);
lcd.print("Humidity: ");
lcd.print(DHT.humidity);
lcd.print("%");
delay(1000);
}

anyone know whats wrong with this code?

it's for a weather station btw

[livid osprey]

Hard to diagnose without the errors you’re getting, but you have three separate dht header files included there, which is almost definitely unnecessary at best, and interfering with each other at worst.

What errors are you getting, and where are you sourcing the three libraries?

Also, you have some included files twice.

[tame raptor]

error: 'dht' does not name a type
dht DHT;

error: no matching function for call to 'LiquidCrystal_I2C::begin()'

error: expected primary-expression before '.'

[tame raptor]

I found this code online, he didn't give the libaries with it

so im kinda stuck rn

😅

[stable forge]

unrelated to your code, but note that there are much better sensors available: https://learn.adafruit.com/modern-replacements-for-dht11-dht22-sensors

[tame raptor]

I have that sensor

or something close to it

[stable forge]

here's our guide. Maybe try our example instead: https://learn.adafruit.com/dht/using-a-dhtxx-sensor-with-arduino

is this on a classic Arduino?