#help-with-arduino

1 messages · Page 4 of 1

random zealot
#

Hello dear collective. I face a struggle.

#

I want to put together 2 circuits (both with Bluetooth and their own processor) into a single board with arduino.

#

I understand I need UNO Rev 3 with 2 bluetooth shields but how do I do it so that they work together?

#

A question that might mesmerize many.

livid osprey
#

Depends what kind of interface your Bluetooth devices are using to communicate with your host. What devices are you trying to “combine?”

livid osprey
random zealot
#

I don't know. I am trying to put them on 1 board while somehow destroying the Bluetooth modulesof both and combining them in a single arduino unit

north stream
#

I suppose it depends on what the interface to the Bluetooth modules is. If it's SPI, you just need separate select lines for each device. If it's I2C, they just need to be at different addresses (or on different buses). If it's asynchronous serial, they'd probably need to be on separate ports (but you can use SoftwareSerial to make GPIO pins into serial ports)

keen isle
#

Hello, is there any way to make a USB mass storage device using LittleFS and Adafruit TinyUSB? I am using a RP2040 if that's of any use.

stable forge
keen isle
#

I see, can I do FAT using the built-in flash then?

#

Aka use Adafruit_InternalFlash

#

Or do I need to write my own thing to read and write to the flash

#

Nevermind, I would need to write my own. Thanks though!

worldly berry
keen isle
#

How can I use StartStopCallback in order to detect when the USB MSD gets ejected?

keen isle
half moon
#

Well friends Thanksgiving dinner is just around the corner. I'm supposedly coding a big project but have nothing to show for it. I uploaded a script to my ide and have a bunch of errors that I have no idea how to solve. any advice would be greatly appreciated.

#

Basically just trying to get this lil device to make a sound when i press buttons. an audio ive created would be nice but i'll take anything at this point.

#

I guess i'm looking for any tutorials you'd recommend or a sketch i can upload and mess with

weak lodge
#

How do I make my Pi Pico in arduino flashing mode?

#

I see the storage pop up, but it doesn't flash via arduino IDE 🤔

manic jewel
# half moon Well friends Thanksgiving dinner is just around the corner. I'm supposedly codin...

Take a look at https://learn.adafruit.com/circuit-playground-music/overview.

If you are not that familiar with Arduino, you might consider using CircuitPython and this tutorial - https://learn.adafruit.com/circuitpython-made-easy-on-circuit-playground-express/play-file

Adafruit Learning System
CircuitPython Made Easy on Circuit Playground Express and Bluefruit

Get started with just a few lines of code!

manic jewel
weak lodge
native dagger
#

What's the best way to do PWM on a pin with long cycle time? E.g. on for 3 minutes, off for 6 etc

north stream
# native dagger What's the best way to do PWM on a pin with long cycle time? E.g. on for 3 minut...

As always, "best" depends on what parameters you're optimizing for. In some cases, you can use the hardware PWM timers by setting their clock source to something slow, or chaining them. In other cases, you can have a timer produce an interrupt, and increment a counter in the interrupt routine to determine when to switch the output. A third approach involves checking something like millis() in your main loop and switching the output when it gets to a particular value (then resetting the compare value to a new one an appropriate amount of time in the future). You could also leverage RTC functionality if that's available, and probably more notions I haven't thought of.

livid osprey
#

For anything in the scale of minutes requiring minimal-drift over time, a controller with RTC or external RTC tied to an interrupt-driven counter will be the best in terms of precision.

#

I believe with only an atmega328’s pwm peripherals, the longest period you can get is (1024 prescaler * 65535) / 16MHz = around 6 seconds?

#

You could then physically wire that to an interrupt pin and drive a counter with the attached ISR to get the required timings?

zealous frost
#

I'm trying to create a HID using NeoKey 1x4 strips, but running into issues with the Keyboard.h library. I get an error of :
packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/USBAPI.h:189:16: error: conflicting declaration 'Serial_ Serial'
I'm using the TinyUSB USB stack and targeting a QT Py M0. (Already tried the Arduino USB stack - didn't work - but different error). Surely the simple HID can be used in Arduino??

solemn cliff
zealous frost
#

@solemn cliff - I've looked at that and unfortunately that doesn't compile either.

#

I'm using the latest Arduino IDE.

solemn cliff
#

ah I don't know then

manic jewel
north stream
zealous frost
#

So literally following code gives an error:
`#include "Keyboard.h"

void setup() {
// put your setup code here, to run once:

}

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

}`

#

The error is:
In file included from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/PluggableUSB.h:23, from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/HID/HID.h:24, from /home/daniel/Arduino/libraries/Keyboard/src/Keyboard.h:25, from /tmp/.arduinoIDE-unsaved20221025-187331-1uel7vk.yu8r/sketch_nov25b/sketch_nov25b.ino:1: /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/USBAPI.h:189:16: error: conflicting declaration 'Serial_ Serial' 189 | extern Serial_ Serial; | ^~~~~~ In file included from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/Arduino.h:154, from /tmp/arduino-sketch-70B1A413F12294132376C75148B7C728/sketch/sketch_nov25b.ino.cpp:1: /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/Adafruit_TinyUSB_Arduino/src/arduino/Adafruit_USBD_CDC.h:90:26: note: previous declaration as 'Adafruit_USBD_CDC Serial' 90 | extern Adafruit_USBD_CDC Serial;

#

This is on Linux, Arduino 2.0.2

#

@north stream - Did you use the Arduino USB stack? That gives the following error with the above code:
In file included from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/Arduino.h:157, from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/SAMD21_USBDevice.h:22, from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/USBAPI.h:37, from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/PluggableUSB.h:23, from /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/HID/HID.cpp:19: /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/HID/HID.cpp: In member function 'virtual int HID_::getInterface(uint8_t*)': /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/USBCore.h:37:56: warning: narrowing conversion of '(int)(((unsigned char)((int)((HID_*)this)->HID_::<anonymous>.PluggableUSBModule::pluggedEndpoint)) | 128)' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing] 37 | #define USB_ENDPOINT_IN(addr) ((addr) | 0x80) | ~~~~~~~~^~~~~~~ /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/cores/arduino/USB/USBCore.h:276:10: note: in definition of macro 'D_ENDPOINT' 276 | { 7, 5, _addr,_attr,_packetSize, _interval } | ^~~~~ /home/daniel/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/HID/HID.cpp:36:14: note: in expansion of macro 'USB_ENDPOINT_IN' 36 | D_ENDPOINT(USB_ENDPOINT_IN(pluggedEndpoint), USB_ENDPOINT_TYPE_INTERRUPT, 0x40, 0x01) | ^~~~~~~~~~~~~~~

north stream
#

I see a warning and two notes, but not an error.

zealous frost
#

@north stream Indeed you are correct. I shall switch to using the Arduino stack. Shame that the TinyUSB cannot be used.

#

I was so used to getting the error, that seeing the orange text made me think it was an error as well.

north stream
#

Perhaps it can be used, however, I don't know how to fix the issue. It appears to be some sort of conflicting definition, but chasing those down can be some effort.

wide shadow
#

I mistakenly flashed M0 firmware to an M4 Express. How can I recover from this? I have many different other MCUs and a JLink if that becomes necessary.

cedar mountain
wide shadow
#

Serial port doesn't show in devices.

cedar mountain
wide shadow
#

Just need to know how to wire it up. Double pressing the button doesn't change anything in devices.

#

I do have a FTDI friend in case that helps

pine bramble
#

why not just put it in bootloader mode.

wide shadow
pine bramble
#

What does the red LED on D13 do?

wide shadow
#

It stays quiet, no light

pine bramble
#

a shortwave or AM radio should be influenced by the board if the oscillator is running.

brazen falcon
#

Sounds like the bootloader in flash got overwritten as well

wide shadow
#

I found the appropriate guide.

wide shadow
tulip sluice
#

Does anyone have a link to resources that can introduce me to coding the s3 feather TFT? I have code from an Arduino Nano that I want to port and use the screen, but I'm finding it really hard to get started...

manic jewel
tulip sluice
manic jewel
#

@tulip sluice On that same page, you will find a menu to another example about using the GFX library and drawing bitmaps.

solemn cliff
tulip sluice
#

Oh - THIS!! I never knew that was there. 🙂

unknown.png
clear badge
#

Im trying to use the bluefruit nrf52 and I cant seem to get simple lines of code to function. I tried to just set a certain pin HIGH and also tried having the on board led flash but neither have worked. The code compiles in arduino with no issue and burns bootloader on to the chip, I can also see an LED switch from a slow blink to a fast blink during upload then back to slow blink, but nothing happens after, even after pressing reset.

north stream
#

Burning the bootloader should not be necessary, it presumably would come with one. However, the next step is using the bootloader to upload your sketch onto the board, which is a different process, and the one you need in order for your code to run.

viral spade
#

i need help with running two servos with different inputs with a trinket pro 5v

cedar mountain
viral spade
#

#include <Servo.h>

Servo myservo; // create servo object to control a servo
// a maximum of eight servo objects can be created

int pos = 0; // variable to store the servo position

void setup()
{
myservo.attach(9); // attaches the servo on pin 9 on the Trinket to the servo object
}

void loop()
{
for(pos = 0; pos < 180; pos += 1) // goes from 0 degrees to 180 degrees
{ // in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for(pos = 180; pos>=1; pos-=1) // goes from 180 degrees to 0 degrees
{
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}

#

i am trying to add another servo and two potentiometers with one pot for each servo

cedar mountain
#

Well, adding a second servo would just be declaring and attaching it to another pin, like:```Servo myservo2;

myservo2.attach(PIN);```

viral spade
#

oh sent an outdated code this is for single servo sweep but do you understand what i am trying to achieve?

cedar mountain
#

Sure. Your main loop would likely just be reading the analog value from the two pots, converting it to an angle, and sending it to each servo.

viral spade
#

yes exactly!

viral spade
#

#include <Servo.h>

Servo myservo; // create servo object to control a servo

int potpin = 0; // analog pin used to connect the potentiometer
int val; // variable to read the value from the analog pin

void setup() {
myservo.attach(9); // attaches the servo on pin 9 to the servo object
}

void loop() {
val = analogRead(potpin); // reads the value of the potentiometer (value between 0 and 1023)
val = map(val, 0, 1023, 0, 180); // scale it to use it with the servo (value between 0 and 180)
myservo.write(val); // sets the servo position according to the scaled value
delay(15); // waits for the servo to get there
}

viral spade
#

okay it didnt work and i might need to add an resistor too

#

#include <Adafruit_SoftServo.h>

#define SERVO1PIN 0 // Servo control line (orange) on Trinket Pin #0
#define SERVO2PIN 1 // Servo control line (orange) on Trinket Pin #1
int potpin = A0; // analog pin used to connect the potentiometer
int val;
Adafruit_SoftServo myServo1, myServo2;

void setup() {
myServo1.attach(SERVO1PIN); // attaches the servo on pin 9 to the servo object
myServo2.attach(SERVO2PIN);
}

void loop() {
val = analogRead(potpin); // reads the value of the potentiometer (value between 0 and 1023)
val = map(val, 0, 1023, 0, 180); // scale it to use it with the servo (value between 0 and 180)
myServo1.write(val); // sets the servo position according to the scaled value
delay(15); // waits for the servo to get there
}

lilac linden
#

help! I've been trying to get a feather m0 BLE to power on some neopixels but have had 0 luck so far. I'm using the test script ```#include <Adafruit_NeoPixel.h>
#ifdef AVR
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif

#define LED_PIN 3
#define LED_COUNT 10
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
#if defined(AVR_ATtiny85) && (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
strip.show(); // Turn OFF all pixels ASAP
strip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)
}```

and just cannot get anything to light up. I confirmed the LED's were working with another controller

#

The green wire is what I'm connecting to the LED's and some 74AHCT125 level shifters but nothing is working. I don't have any idea what could be going wrong here

north stream
#

Hard to tell where the wires are going in your pictures

inland gorge
lilac linden
# inland gorge That code does not actually turn on any LEDs. Are you doing anything in `loop()`...

Yeah the loop is supposed to show several patterns.

void loop() {
  // Fill along the length of the strip in various colors...
  colorWipe(strip.Color(255,   0,   0), 50); // Red
  colorWipe(strip.Color(  0, 255,   0), 50); // Green
  colorWipe(strip.Color(  0,   0, 255), 50); // Blue

  // Do a theater marquee effect in various colors...
  theaterChase(strip.Color(127, 127, 127), 50); // White, half brightness
  theaterChase(strip.Color(127,   0,   0), 50); // Red, half brightness
  theaterChase(strip.Color(  0,   0, 127), 50); // Blue, half brightness

  rainbow(10);             // Flowing rainbow cycle along the whole strip
  theaterChaseRainbow(50); // Rainbow-enhanced theaterChase variant
}```
#

I don't think theres any issue with the code im more leaning towards a wiring issue but im still unsure what I did wrong there. I basically followed the raspberry pi guide when wiring the LED's

inland gorge
lilac linden
#

the only two relevant pins in this setup is pin 5 and gnd, I need to run 6 neopixel strips off of this controller but I want to get one lit up before committing to this

leaden walrus
# 
#define LED_PIN    3
#

change to 5?

lilac linden
#

that might be a good thing to try... xD

inland gorge
#

yes your LED_PIN define needs to match how you've got it wired up

clear badge
#

does any one have experience using protomatter library or know another library I can use, im trying to use it with a 64x64 led matrix and cant get it to output anything on my display. my board is also the nrf52 feather

north stream
#

Can you output test patterns on your LED matrix?

clear badge
#

No, it seems to just be displaying random pixels/lines regardless of what I tell it to do

north stream
#

Ah, that's different from "can't get it to output anything"

fair eagle
#

Hey, could I possibly get some help when it comes to the STM32F405 Feather. I'm struggling to get any communication between Arduino IDE and STM32CubeProgrammer. I also don't know what kind of firmware to put under the highlighted section of the second picture

image.png image.png
#

I'm new to all of this, so it could be a simple mistake

#

If I could also skip over the STM32CubeProgrammer that would also be fine. I tried following everything on the learn page for microcontroller, and I'm trying to connect via usb

clear badge
tulip sluice
#

Has anyone had issues with their S2 Feather TFT disconnecting while the Arduino IDE is in the process of compiling / uploading code? I'm working with just the board, no connections on any pins. It was working fine, and then it went into a boot loop, so I reflashed with the feather-esp32-s2-factory-reset-and-bootloader as per the instructions, and now I get these disconnects. Everything is stable until it (appears) to finish compiling, and starting to upload.

pine bramble
#

In platformio there's more than one way to upload, iirc. Something openocd for example.

nova spire
#

I had a quick question

#

I am using the esp 32 pico with the STEMMA QT wire to a 6 DOF IMU

#

I wanted to know how do I access the data from the STEMMA QT in my arduino code?

leaden walrus
#

most likely via Wire

#

which specific ESP32 board are you using?

tulip sluice
#

Is the esp32-s2 Feather TFT a touch screen? The touchscreendemo example returns 0 for pressure always.

nova spire
nova spire
leaden walrus
#

for that one, it ends up being Wire1

#

what 6 DOF IMU are you using?

nova spire
#

If I wanted to use wire1 in the code above, what would I need to change?

leaden walrus
#

to switch to using Wire1, change this line:

  if (!ism330dhcx.begin_I2C()) {
nova spire
#

!ism330dhcx.begin_I2C(Wire1)

leaden walrus
#

looks like you'll need to include the address as well

#

as the first parameter

nova spire
#

if (!ism330dhcx.begin_I2C(0x6A)) {

leaden walrus
# 
  if (!ism330dhcx.begin_I2C(LSM6DS_I2CADDR_DEFAULT, &Wire1)) {
#

try that

#

or with the 0x6A

# 
  if (!ism330dhcx.begin_I2C(0x6A, &Wire1)) {
#

should be equivalent

nova spire
#

Trying the first one righ tnow

leaden walrus
#

don't forget the & in front of Wire1

nova spire
#

First one failed to find it

#

trying the second one right now

#

First one did successfuly upload though

leaden walrus
#

ohhhh....i think i know why it might not be working. it's an esp32 thing.

nova spire
leaden walrus
# 
  Wire1.setPins(SDA1, SCL1);
  if (!ism330dhcx.begin_I2C(0x6A, &Wire1)) {
#

try that

nova spire
#

Were, good, just got it

#

Thanks alot

#

I would have never got it in 1 million years

leaden walrus
#

cool! glad its working.

nova spire
#

I really appreciate it.

rose moss
#

Accidentally plugged in my 24V power supply into my Arduino Mega powered Nixie Tube Clock instead of my 12V one... I smell burnt components, It still turns on but does not display properly.... Is my entire clock destroyed, or just my Arduino Mega board?

rn_image_picker_lib_temp_cd936a87-766e-4057-a049-436f2f35f91c.jpg
north stream
# rose moss Accidentally plugged in my 24V power supply into my Arduino Mega powered Nixie T...

There are three likely possibilities: the low voltage power supply, the AVR chip itself, and the high voltage level shifters. If it displays at all, the high voltage power supply is presumably fine. The low voltage supply is basically the regulator (linear or switching) and its capacitors. If it's not producing a clean output, the AVR chip won't work properly. The AVR chip is the bulk of the actual logic in the clock. The level shifters are what it uses to let the low voltage control signals from the AVR turn on digits and switch between tubes.

frosty thistle
#

Hi all, does anyone know if the Adafruit_MCP23017 library works on an ESP32? I have a very basic setup and I keep getting an error on mcp.begin_I2C().

north stream
#

What error do you get?

frosty thistle
#

In the example its if (!mcp.begin_I2C) { Serial.println("error"); }

#

So I just get "error" 🙂

#

scanner found the device at 0x20

#

I swapped out for a diff IC

#

And still same issue

#

I got it...

north stream
frosty thistle
#

Docs say that default address is 0x20 so I left the begin_I2C() as it was in the example, but If I used begin_I2C(0x20) it works.

north stream
#

Good catch. I don't see the default address being set in the code for some reason, so that makes sense.

frosty thistle
#

Thats how I found it. I was looking in the library source for any extra error reporting. Thanks for looking!

acoustic lichen
#

hi guys! I'm new to adafruit and just purchased the adafruit air pump and valve, but I use the arduino uno board. Anyone knows the code for the air pump and valve? I have little experience with coding 😢

frosty thistle
#

wait, I was looking in the wrong spot, as I went back I found this in the header file:

#define MCP23XXX_ADDR 0x20 //!< Default I2C Address

north stream
leaden walrus
#

@frosty thistle 0x20 should be used by default. so seems weird that.

mcp.begin_I2C();

did not work, but

mcp.begin_I2C(0x20);

did work.
they should be equivalent.

hollow coral
#

anyone here actually a contributor to the arduino project? (meaning like, github etc)

#

was wondering if there was someone I could poke to get a PR on a lesser used repo approved

gilded swift
hollow coral
#

has only been about a day and a half but it's not an active repo so I wasn't sure if anyone was actually paying any attention to it

gilded swift
#

An okay, yeah I’m not familiar with anyone working on that repo. Best bet is to request a review on it and see if it pings someone to take care of it

trail swallow
#

The reason I'm looking into this is to try to find if my project's sudden and unpredictable crashes are due to power problems.

inland gorge
trail swallow
#

Aah, okay. Neat, thank you!

#

Most of the Feathers have an Enable pin that will allow shutdown via logic level

jaunty nest
#

somebody here knows what this part is on the back side of the Arduino Micro?

WIN_20221203_15_30_22_Pro.jpg
heavy star
#

I think it might be a resistor

jaunty nest
#

here is another shot from a bit further away

WIN_20221203_15_37_21_Pro.jpg
gilded swift
#

Looks like a PTC fuse

jaunty nest
#

i just wonder where i can find that on the schematics

gilded swift
jaunty nest
#

but wouldn't a PTC fuse look like this part?

image.png
gilded swift
#

Not necessarily

jaunty nest
#

you mean that i guess?

image.png
gilded swift
#

Yeah

jaunty nest
#

many thanks

heavy star
#

I was about to say might be the PTC fuse too after poking around

gilded swift
heavy star
#

I wonder why it has an infinity symbol…

jaunty nest
#

arduino logo

heavy star
#

Oh XD durr

#

I have a brain I swear

jaunty nest
#

i thought it might be something special, custom made or so

gilded swift
#

Nah, fuses usually have it

#

It’s weird

jaunty nest
#

oh lul

#

maybe thats why arduino logo contains it, and maybe thats why they want one having that symbol on it on their product PES_Think

gilded swift
#

I don’t think there’s a real reason

#

Or I don’t know or anyway lol

jaunty nest
#

i thought they laser it on (or something) on their own ^^

#

again, many thanks. Trying to rebuild it in KiCAD with my bad knowledge 😂

stray jay
#

I just switched my playground express from makecode/javascript to arduino, I was able to run the Blink example successfully, but when i tried to later modify the code to CircuitPlayground.setPixelColor, it's not working. is there something I'm missing, I pulled in the library but maybe i need to initialize it? i dunno

manic jewel
#

Or post your code here

stray jay
#

no it uploads fine, but no lights

# 
#include <Adafruit_Circuit_Playground.h>
void setup() {
  
  CircuitPlayground.setBrightness(50);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  CircuitPlayground.setPixelColor(5, 200, 0, 0);
  delay(5000);                      // wait for a second
  CircuitPlayground.clearPixels();
  delay(5000);                      // wait for a second
}```
manic jewel
stray jay
#

thanks for this. i'll see if the begin call fixes it

#

that works. thanks again

manic jewel
#

Lots of other examples in there as well.

#

@stray jay You might also consider using CircuitPython if you are new to programming.

stray jay
#

ok, i'll check it out. I moved away from the javascript/makecode solution because I need to do more advanced things with the microphone than it allows

hollow coral
#

is there a way for an Arduino connected to a PC via USB to identify the device it's connected to?

#

to be clear I want the Arduino to be able to identify the host, not the other way around

#

looking for a rudimentary way to make sure the device it's connected to is the device it's supposed to be connected to

cedar mountain
#

I'm not aware of a built-in USB mechanism to do that, so it would probably rely on some additional software on the PC side to send a unique identifier like its MAC address, or a cryptographic key if you want to be secure about it.

hollow coral
#

also, if you outgrow a mega is there something above it?

#

mostly need more program memory

#

more GPIO is a +

#

I'd look at an RPi but they are like impossible to find so building a project around one seems silly

#

especially since speed isn't really an issue

#

like I was looking at just splitting the code across multiple megas but that seems weird

#

the teensy looks plausible but it out of stock everywhere

wide shadow
#

Adafruit is starting to sell RP2040 based boards.,

stray jay
#

I'm trying to follow the code samples here: https://learn.adafruit.com/circuit-playground-sound-controlled-robot/using-the-microphone
But it does not compile, instead i get the following errors: ```C:\Users\nelso\Documents\Arduino\libraries\Adafruit_Circuit_Playground\utility/Adafruit_CPlay_Mic.cpp:293: undefined reference to fft_input' C:\Users\nelso\Documents\Arduino\libraries\Adafruit_Circuit_Playground\utility/Adafruit_CPlay_Mic.cpp:294: undefined reference to fft_execute'
C:\Users\nelso\Documents\Arduino\libraries\Adafruit_Circuit_Playground\utility/Adafruit_CPlay_Mic.cpp:295: undefined reference to `fft_output'

Can someone help me get back on track?
wide shadow
#

I've been using chat.openai.com to help with fixing my errors. It is doing quite well.

north stream
wide shadow
#

Is it really that much improved over the Mega? I know it is Adafruit's replacement for the Mega.

north stream
#

Mega: 16MHz, Grand Central: 120MHz. Mega: 8kB RAM, GC: 256kB RAM. Mega: 256kB flash, GC: 1MB flash.

#

Note that the Grand Central is a 3.3V board, while the Arduino Mega is a 5V board, which may or may not be an issue, depending on what you're connecting it to.

hollow coral
#

Oh I was actually looking at the SAMD51 line directly, didn't know there was a board for it

wide shadow
#

From what I've been reading SAMD51 boards are becoming more scarce.

hollow coral
#

Yeah. I wrote it off because I couldn't find it in stock

gilded swift
#

Very scarce

#

I have 2 SAMD51 chips waiting for a good moment

wide shadow
#

Some of the other vendors that were using SAMD51 boards are now replacing them with RP2040 based boards.

hollow coral
#

If not for the shortages I'd probably just say screw it and go CM4

#

Yeah. The 2040 is easy to find

#

But it doesn't have as many GPIO

#

And every pin on the mega is used

#

So would have to deal with io expanders then

gilded swift
#

Other people are using nRF52 and nrf53 because they are in stock

wide shadow
#

I just checked, and the Grand Central M4 is currently in stock.

hollow coral
#

Yeah but the chips aren't. So to develop something with that board and then try to make it wouldn't work

gilded swift
#

There’s 206k nrf52840 chips in stock

#

At DigiKey

#

So many haha

wide shadow
#

Are there good proto boards for them?

gilded swift
#

Between both in stock, like 240k nrf52840

#

Adafruit have nRF52840 feathers

#

Not sure how many pins you need though

hollow coral
#

Do those have >=54 GPIO pins lol

#

The mega has 54

gilded swift
#

The feathers no

hollow coral
#

I wish they made a version of the mega with more program memory

wide shadow
#

Almost sounds like you might need to daisy a few MCUs together.

hollow coral
#

Because it's really only program memory that's the issue

wide shadow
hollow coral
#

No

gilded swift
#

47 on the nRF52840 73VQFN

hollow coral
#

Program memory as in flash

brazen falcon
#

Well, RP2040 can go up to at least 16MB

gilded swift
#

So 7 short

hollow coral
#

Yeah but not enough GPIO

gilded swift
#

What are you making that is using all 54 GPIO on the mega 54

hollow coral
#

And it's timing sensitive so I'm not sure how well io expanders would work

brazen falcon
#

GPIO expanders work?

hollow coral
#

Like sensitive enough to use nop instead of delay lol

wide shadow
#

Is there anything you could shave off to the same GPIO expander and keep good enough timing?

brazen falcon
#

ESP32-S2 has up to 43, but I think 6 of those are dedicated.

hollow coral
#

I was checking into that but I'm not seeing anything

gilded swift
#

Why not use an FPGA if timing is a concern?

hollow coral
#

Expense

gilded swift
#

Tons of FPGA have 100+ GPIO

hollow coral
#

And shortages lol

wide shadow
#

Kind goes towards my thoughts on daisying a few MCUs with different branches of GPIO for expansion

gilded swift
#

Plenty that are <$100

hollow coral
#

That are easy to write for?

wide shadow
#

That's subjective.

hollow coral
gilded swift
#

Verilog is pretty straight forward by the estimation of a lot of people who’ve learned it

#

Plenty of lattice chips can use ice studio

wide shadow
#

Maybe pump your code through chat.openai.com to see if it can optimize it in any way?

hollow coral
#

The code is already written so yeah. Would need to port it

gilded swift
#

Just put a risc-v soft core lol

wide shadow
#

I was thinking of RISC-V as well.

hollow coral
#

I've never messed with fpga. Only Arduino really

gilded swift
#

Then compile it for risc-v gcc

#

Shawn Hymel has a great intro to fpga

wide shadow
#

There are some good web based MCU emulators out there.

gilded swift
#

Yeah

wide shadow
#

That could help you get acquainted with the chip before you get the hardware.

brazen falcon
#

Are there usable risc-v cores for fpga now without proprietary extra stuff you need to add?

cedar mountain
#

Yes, there are open-source cores available I believe.

brazen falcon
#

I haven't been following it too closely but last time I looked (a while ago) there wasn't anything functional.

#

That was 6 months or a year ago though

cedar mountain
#

I don't know your project details, but if you've been happy with a Mega, you probably would want to target a larger-package ARM chip like a 100-pin STM32 instead of switching completely to a FPGA plus soft-core architecture.

brazen falcon
#

STM32 gets into availability again though

gilded swift
#

Yeah, NXP might be an option

#

i.MX8 seems to come in and out

wide shadow
#

How large of production runs of the product can also make a difference.

cedar mountain
#

I mean, just filter on Digi-Key for "Cortex M", ">80 pins", and "in stock", and see what pops up. 😉

gilded swift
#

BGA is tough to work with but lots of GPIO

brazen falcon
#

Air105 is an M4 design with a QFN88 package and might have enough GPIO though I haven't looked into how many of those are dedicated.

gilded swift
#

And there’s 51 in stock

brazen falcon
#

Any STM32 >QFP64 seems to be super dicey to find.

hollow coral
#

The ice stick looks interesting

#

But the board only has 16 IO despite the chip having 144?

#

Did they really use all of them or did they just not break them out to save space?

cedar mountain
#

The latter, I'd assume. They just wanted a small form factor.

#

Did they really use a 144-pin package on that, though? There are a number of iCE40 chip variants.

hollow coral
#

I thought so

#

I mean I can use 16 to proof of concept it but I'd immediately outgrow it as soon as that phase was over

hollow coral
hollow coral
#

The alchitry cu looks like it exposes most of the pins

dusk orchid
leaden dew
#

where's the best place I can find info or a guide on PID controller?

leaden walrus
#

that's a very broad and complex topic. there won't be any one single "best" option.

#

can you clarify what you are after. trying to understand PID in general? working with a specific PID controller?

leaden dew
#

so eventual goal is working on a spider-like walking robot. So to start and get used to arduino and servos etc, I'm making a robot arm to explore coding the motion of the motors

#

I'm not sure a whole lot about PID, but what I know is that P, I, and D are different bits that work together to produce smoother motion

#

so i guess what I'm after is a teaching like video that I can plop next to me while I sit and work with their code n stuff. Oh, and for the moment I want to pre-code a routine (just cause I think it's easier to learn PID that way)

leaden walrus
#

have you selected motors yet?

leaden dew
#

yep, SG90 micro servo motors; yes small and 'weak' but tis a learning curve 🙂

#

and so far, they've been pretty good at holding positions under load; depending what random code I found and tested them with

leaden walrus
#

those are hobby servos

#

in general, you don't need to worry about PID control when using those

#

it's buried in the servo and you don't have any access to it

leaden dew
#

ahh; is that the little encoder thing right next to the dc motor?

#

not the 'PID controller' as per say, but the thing that has the PID controller code

leaden walrus
#

probably. a part of it - the feedback. which is typically a pot (variable resistor).

#

the actual PID control may be implemented via a dedicate circuit or some IC

#

have you broken one of the SG90s open to see the guts?

leaden dew
leaden dew
leaden walrus
#

it's so they are easy to use

#

all you need to do is feed them a PWM signal and the servo does the rest

#

the PWM signal is like a "commanded position"

leaden dew
#

ohh, so if I vary that command with respect to something else (I'm guessing time?) then it should produce a curve

#

if the start and end position and path were plotted on a graph

leaden walrus
#

in general, yes. with hobby servos, there's no speed control. when you change the PWM signal, they respond by moving to the new location as fast as possible

#

so if you wanted to have some kind of controlled motion, you'd end up sending a series of "raw" PWM signals

#

like if you wanted to move "slowly" from A to B

#

you wouldn't just send it the PWM signal for B

#

you'd need to send a constantly updating signal that slowly varies from A to B

#

(this is hobby servo specific)

leaden dew
#

Is there something to explain why when it rotates sometimes and holds a position, there's a really good amount of forceback, and other times I can push it out of it's position

#

would the current available affect it in these servos?

#

or is that a variable or setting I can call from the Servo.h file?

leaden walrus
#

it should try to maintain position as long as the PWM signal is being sent

#

if the PWM signal is flat, then most servos will "deactivate" - that's when you could grab it and move it by hand

leaden dew
#

So what kind of servo would best be utilised for PID? Dw, still going to do my robot arm stuff, just curious what type of motor uses it

leaden walrus
#

first see if the hobby servos will work

#

if you need to implement your own PID controller, that's like 10000000x more complex

#

what's currently not working when trying to use the hobby servos?

leaden dew
#

everything's all good atm, not got any expectations, like curious george with an arduino board and motors rn (I'd love to see that animated)

#

just curious, not sure what the 'keywords' around motors are what to search for things: because I believe that if I can think of a simpler variation of what I want, someone's probably done it on the internet

native dagger
#

Typically you wouldn't use PID with servos since they have their own feedback system built in, that's their strength. But many other motor types benefit

leaden dew
#

i also realise this may be the wrong channel to talk servos, just seen the robotics channel

leaden walrus
#

oh yah. good idea. yep, if you want to get more nuts-n-bolts on PID, that'd be a good channel to chat about it.

sacred ivy
#

I need to make a variable available across different c files in a given complier, but I dont know how my IDE would reference it. What would it be called or how could I do it?

More info:
So I have main.c and I have tmr1.c. I want to make a variable in main.c but also use it in tmr1.c

sacred ivy
#

AHH I found it. "extern" is the keyword

brazen falcon
#

There's a technique called servo easing to remove the sudden jerk at the end of a servo motion.

#

If you don't require a full PID solution it would be lighter weight.

grave mortar
#

Hi friends I'm too dumb I want to build a hex code by joining certain sections of it together, obviously this gives me the hex as a sting but how do I convert it to 0xC800F641F
basehex = "0xC800F" toggelone = "E4" toggletwo = "64" up = "1F" code = basehex + toggeltwo + up;

lilac ginkgo
#

Any reason to use strings? You could use hex literals ```c
basehex = 0xC800F;
toggelone = 0xE4;
toggletwo = 0x64;
up = 0x1F;
code = basehex + toggeltwo + up;

If you need their bytes to be concat'ed, add trailing zeroes for alignment (and OR should be faster at that point), formatted the text so you can see the alignment  ```c
basehex   = 0xC800F000000; //or 0xC800F << 24 
toggelone =      0xE40000; //or 0xE4 << 16
toggletwo =        0x6400; //or 0xEA << 8
up        =          0x1F;
code = basehex | toggeltwo | up;
grave mortar
#

No reason I've never worked with hex, basically there's a toggle bit in the original binary that I'm trying to match up with so don't know what I'm fdoing 😛

grave mortar
#

I'll tey this when I pull it out tomorrow thank you

hearty gazelle
#

I'm writing a program that involves a loadcell that I want to calibrate in the beginning. I use input from the serial monitor to start the different stages of the calibration. Here is the code that does so, mostly taken from the HX711_ADC library. I'm using a state machine in loop(), so that I can easily run multiple functions in parallel. I converted this into a state machine as well, replacing the while loops with if statements and incrementing the calibration state instead of setting _resume to true. I found that I was losing inputs from the serial monitor this way. Is there an ideal way to work around this? I've looked at buffering here, http://www.gammon.com.au/serial, but I feel like there should be a simpler way of dealing with this.

boolean _resume = false;
  while (_resume == false) {
    LoadCell.update();
    if (Serial.available() > 0) {
      if (Serial.available() > 0) {
        char inByte = Serial.read();
        if (inByte == 't') LoadCell.tareNoDelay();
      }
    }
    if (LoadCell.getTareStatus() == true) {
      Serial.println("Tare complete");
      _resume = true;
    }
  }

  Serial.println("Place known mass on loadcell. Enter into Serial Monitor.");

  float known_mass = 0;
  _resume = false;
  while (_resume == false) {
    LoadCell.update();
    if (Serial.available() > 0) {
      known_mass = Serial.parseFloat();
      if (known_mass != 0) {
        Serial.print("Known mass is: ");
        Serial.println(known_mass);
        _resume = true;
      }
    }
  }
#

Just incase, here is my loop (The code above is called in ManageLoadCell()):

void loop() {
  if (systemState == 0) { //Standby
    TimeKeeper();
    WriteDataToSD();
    WaitForInput('s');
  }
  else if (systemState == 1) { //Initialize load cell
    TimeKeeper();
    WriteDataToSD();

    ManageLoadCell();
  }
  else if (systemState == 2) { //Countdown 
    TimeKeeper();
    WriteDataToSD();

    GetCellData();
  } 
  else if (systemState == 3) { //Ignite motor
    TimeKeeper();

    //Log data
    //Switch when load cell input changes
    systemState++;
  }
  else if (systemState == 4) { //Motor is running
    TimeKeeper();

    //Log data
    //Wait for a few seconds after no load cell input before moving on to next stage
    systemState++;
  } 
  else if (systemState == 5) { //Motor no longer running
    TimeKeeper();

    systemState = 0;
    //Probably want to do some sort of shut down procedure
    //systemState++;
  }
  else if(systemState == 42) { // Abort
    TimeKeeper();
  }
}
hearty gazelle
#

I'm now using a while loop in the main state machine to accurately read serial input, with a state machine instead of while loops in ManageLoadCell(). I'd still love to know if there are any easier ways of accurately reading serial input in the loop without while loops and preferably without buffering.

Screenshot_2022-12-07_at_16.12.03.png
lilac ginkgo
# hearty gazelle I'm now using a while loop in the main state machine to accurately read serial i...

no idea about the issue itself, but you can probably clean this a bit to make it easier to read when someone tries to help:

  • use switch over if/elses
  • since TimeKeeper() is called on each state, get that done right before the switch instead of duplicating it for every branch
  • im pretty sure that while (systemState == 1) would be equivalent to the your current code with an extra if (systemState == 1) before the loop
sudden dome
#

Does anyone know if it's possible to load a binary at runtime and run it on ESP32 without reflashing firmware? So for example you would have a firmware running on the ESP that can select and load another binary from an SD card or from flash memory. I can't find the right documentation or examples to get started.

hearty gazelle
#

I don’t see how it would have an effect

#

But I’ll try just in case

#

Thanks for the help

lilac ginkgo
#

also, instead of getting your code indented a lot by chaining ifs you could add guard clauses, which helps with readability ```c
if (!condition)
return; //for example

while (condition) {
//code
}```

hearty gazelle
stone spade
#

Hey there. Does anyone know of a conflict between the Adafruit Arduino neopixel library and MQTT libraries? I have tried both pubsubclient.h and MQTT.h, and with both I get board crashes right as the neopixel strip.begin() command is called. The board continually reboots. I have swapped in FastLED and it works fine, but I want to control an RGBW strip and FastLED Does not support these. Any thoughts or workaround suggestions are appreciated!

#

I should mention to that the board in question is an ESP 32 C3

#

And also that stripping out the MQTT code and the neOpixel library works fine.

livid osprey
#

In the case of the former, the exact message really helps nail down the exception occurring.
If the lattter is true, what might be happening is alignment of spikes common to both initiation of pixels and Wi-Fi radio causing your voltage to drop below operating voltage.

stone spade
#

Watching the serial monitor, My board successfully connects to Wi-Fi in the setup of the sketch and then reboots right after as the neopixel.begin() hits. This is the error it shows:

ESP-ROM:esp32c3-api1-20210207Build:Feb 7 2021rst:0x3 (RTC_SW_SYS_RST),boot:0xd (SPI_FAST_FLASH_BOOT)Saved PC:0x403821bcSPIWP:0xeemode:DIO, clock div:1load:0x3fcd6100,len:0x438load:0x403ce000,len:0x918load:0x403d0000,len:0x24e4entry 0x403ce000

#

I don’t know if this makes any sense to you but, googling this didn’t provide much Insight for me.

wide shadow
grave mortar
wide shadow
#

Apparently there is now a RISC-V processor ESP32C3 out now on Seeed Studio, XIAO ESP32C3 $5/ea

north stream
hearty gazelle
north stream
sacred ivy
#

Is doing something like this:
UART1_Write(0xFF); UART1_Write(0xFF); UART1_Write(0xFF);
Considered bad practice? Would it make more sense to make a for loop with only 3 iterations?

pine bramble
#

One way to look at it is that doing it that way forces 'them' to check each line for differences, when looking at your code, months from now.
In a loop that's explicit.
Both versions are likely to compile to an identical binary image. The compiler often optimizes such things.

sacred ivy
#

makes sense as this is easier to read months/years from now. "Oh, this makes sense and its readable" vs "Why did I use a for loop?"

pine bramble
#

I like to see both delimiters '{' and the matching '}' at all times, so that usually means I compress vertically to the extent that 'indent' reformats my code. (Similar to Control+T in Arduino IDE.)
The text editor I work with matches them and highlights both at the same instant. ;)

#

Since the keybinding to make a duplicate of one line of code, in rvim, is 'yyp' it's very easy to replicate one line exactly. I'll do this when I'm in a hurry to prove an idea.

bitter veldt
#

hello. i would like to power a Qt Py via external 5V source. i am reading https://learn.adafruit.com/adafruit-qt-py-esp32-s3/pinouts and it says:

You can also use the 5V pin as a voltage input but you must have some sort of diode (schottky, signal, power, really anything) between your external power source and this pin with anode to battery, cathode to 5V pin.
but i am not quite able to grok what it means. the diode would be inline +5V from PSU to 5V pin and then PSU GND goes to the BAT or the GND pin?

hearty gazelle
#

Just a quick question, is the reason Serial input (from the serial monitor) is sometimes lost because the arduino is running other code/processes when the input comes in?

north stream
#

It can be. There are various possibilities.

frosty prairie
#

anyone have some reading/watching material on making smart messages?

#

I'm sending some small data over CANbus, however I think just sending 1-9 is a bit of a waste

#

like I could have some error detection in there or something else?

sacred ivy
#

Am I using atoi correctly?
char testbuf[3]={1,2,3}; unsigned int val; val = atoi(testbuf);

#

(testbuf is literally a buffer to make sure the function can handle arrays)

tardy iron
sacred ivy
#

ahh let me change that, I see an error already

sacred ivy
tardy iron
sacred ivy
#

My problem is....my data Im getting is in an array. So [0] is "1", [1] is "2", [3] is "3"

#

Its not "123"

#

🤔

tardy iron
#

what exact form does your input have?

sacred ivy
#

Im gonna get back to you on that in ~an hour if thats ok.

#

But its basically a string buffer from a nextion display and I am sending it as such:

"n1_"1" "2" "3" (spaces are only there for readability here on discord)

tardy iron
#

someone else will probably be here, even if i'm not

sacred ivy
#

I actually figured it out. Im not getting strings back, but rather ASCII characters that represent those numbers. So, "1" is actually 49 (base 10) per the ASCII code. I got my thinking mixed up and thought I was getting a string, but in reality, Im just getting the representation of each number. My USART buffer is a char variable and not a string.

And actually..I did this before 😅 but on another programming language. Basically, all I have to do is subtract 48, then multiply by either 100, 10 or 1 for the respective place, and then add it all together.

At least in theory

tardy iron
#

or it might be easier to copy the right number of characters from your USART buffer into a char array and null-terminate it, then pass it to atoi

sacred ivy
tardy iron
sacred ivy
#

1st answer basically lol.

#

hold up now I have to try something 🤔

tardy iron
#

it's close… you're initializing a 4-element char array with {0, 0}, basically, and C zero-initializes all trailing array elements that aren't specified in the initializer, so the other two chars in the array are also zero

sacred ivy
#

OH, so thats why it works. Initially its all set to 0, but In reality, Im only reading 3 bytes, so the last byte stays.

#

Im not really reading 4 bytes

tardy iron
#

ah, that makes sense

sacred ivy
#

ahh but heres the kicker: it works without it now too. My buffer has that null char automatically 🤔 . I think I did something last night to make things work. What probably made it work was doing this:

IntBuffer[0]=buf[3]; IntBuffer[1]=buf[4]; IntBuffer[2]=buf[5];

Is it nice looking? No. Do I really need a for loop for this? Probably not. Its easy to read (like I posted way above). This function got rid of the "\0" null characters by just moving stuff in a new buffer. I think also, "buf" then had leading 0's, causing the atoi function not to work. By getting rid of those, makes it work 😅

#

ahhh what sleep will do

tardy iron
sacred ivy
#

Its declared at the beginning before main BUT thats a good point. Just in case something gets stuck, I'll memeset it to 0 before and after use

#

you know, a random char might get stuck and then the whole thing wont work lol

pine bramble
#

Stupid question, but if I use a Stemma QT sensor and a Stemma QT display, would I be able to run the display through the sensor, while still reading from the sensor? (the last time I did anything with arduino was 5th grade lol)

cedar mountain
#

Yes, the connection is an I2C shared bus, so you can hook up a number of Stemma boards to the same wires in any topology and access all of them, assuming they have non-conflicting addresses.

pine bramble
#

Thanks!

mighty maple
#

how can i output to the serial port of an arduino nano without using the arduino libraries? im trying to learn bare metal programming to actually understand whats happening behind the hood.

cedar mountain
mighty maple
#

yeah, i saw a tutorial on that but it doesnt seem to work:

#include <avr/io.h>

#include "uart.h"

void UART_init(uint16_t ubrr) {
    // set baudrate in UBRR
    UBRR0L = (uint8_t)(ubrr & 0xFF);
    UBRR0H = (uint8_t)(ubrr >> 8);

    // enable the transmitter and receiver
    UCSR0B |= (1 << RXEN0) | (1 << TXEN0);
}

void UART_putc(unsigned char data) {
    // wait for transmit buffer to be empty
    while(!(UCSR0A & (1 >> UDRE0)));

    // load data into transmit register
    UDR0 = data;
}
cedar mountain
#

I'm unfamiliar with the AVR off the top of my head. Do you need any further initialization to set the GPIO pins you're using to UART mode or something like that?

mighty maple
#

i dont think so

#

hold on im gonna read through the datasheet

cedar mountain
#

If you have a logic analyzer, seeing if the pins are outputting anything would be a great troubleshooting step. It's easy to get the baud rate wrong sometimes, and that'll be obvious if it's otherwise working.

tardy iron
#

@mighty maple how are you compiling your code?

mighty maple
#

ah i may need to set the frame format

image.png
mighty maple
# 
SRC=$(wildcard *.c)

default: $(SRC)
    avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -o ./bin/m328.bin ./src/*.c
    avr-objcopy -O ihex -R .eeprom bin/m328.bin bin/m328.hex
    sudo avrdude -F -V -c arduino -p ATMEGA328P -P /dev/ttyUSB0 -b 115200 -U flash:w:bin/m328.hex
#

its some sort of frankenstein made up of youtube tutorials and stack overflow tabs

mighty maple
#

now interfacing with a serial eeprom

#

rn my goal is to write a wozmon type thing

sacred ivy
#

@mighty maple I know im a bit late, but another option is to use mplabx, with XC8 and then download code configurator v5. From there you can generate the code for UART and see what it looks like, or just use it as it gives it.

north stream
#

You can also look at the source code to Arduino (yay open source) and see how they do it.

sacred ivy
#

Ive done that when trying to port over code from Arduino libs to my own complier. Problem is, they tend to use tricks and pointers and stuff I sort of cant read 😅

north stream
#

True, it can take some effort to prise out what the code is actually doing. I've been known to do a fair amount of copy, paste, and modify, to move from their code to my code.

stray jay
#

Can anyone help me get started with audio input pattern recognition using the ZeroFFT library? I'm using the circuit playground express

pine bramble
#

I need help connecting and uploading to an esp8266 12-e. If anyone wants to help, please ping me.

cold lagoon
#

Hi. yesterday i wrote a 200 line code and today i discovered that it doesn't work, so i broke it down to the basics, which also don't work.
any ideas why?

image.png
#

the commented stuff is the rest of the code. but i don't even get the transmission to work so its unimportant

pine bramble
#

Breaking it down was a good idea. Posting images may not be (did not look ;)

cold lagoon
#

normally i post code as code but when you have a send and a receive part its easier to compare side by side

pine bramble
#

That makes sense. ;) I really wouldn't look in the first place to see what you did, there ordinarily. ;)

#

I would hard-code the analogWrite() line as the entire program, with whatever is required for it to 'work' as my first test.

#

You probably want early feedback to know that the code is doing what it is supposed to be doing.

#

If I write a complex program, and manage to get it working 'once' I use the current wiring of the hardware as a test bed, and (sometimes) start over, using the newly-tested hardware to validate the code as it gets rewritten.

#

That way I know (for sure) the hardware is 'good' and can concentrate on writing good code that has (lots fewer) compromises in it (initially present to 'just get it to work, once') ;)

cold lagoon
#

I've tried everything. Rewiring everything checking the pull-up resistors, writing a even simpler code. but it still doesn't work. here is the new code:

image.png
stable forge
cold lagoon
#

they have vommon ground. sadly i dont have anythign to watch whats on the bus

inland gorge
cold lagoon
#

its an arduino nano and an Attiny 44

#

tha attiny 44 runns with 3.3V

#

but it has worked before with a nother sketch (that i sadly dont have anymore)

leaden walrus
#

can you get the attiny address to show up in an i2c scan?

cold lagoon
#

.......

#

you can officially call me the dumbest person alive. the i2c lines where plugged in to D4 and D5 instead of A4 and A5. AND I WASTED A WHOLE DAY ON IT

#

sorry for wasting your time 🙂

pine bramble
#

Hey what'd be not very smart would be to not retain the lesson in any way at all. ;)
The lost time is your motivation to not repeat the mistake (not that it's a guarantee, but the motivation can be quite substantial).

#

check your assumptions - that's rather inexpensive to do, so do it.

inland gorge
wraith current
#

wow, thanks a lot default I2C begin method. you made the optional frequency 0 so if you leave off the frequency then your I2c won't work at all. Just spent like 3 hours banging my head against this thing.

Screen_Shot_2022-12-15_at_5.19.04_PM.png
north stream
#

Yow, that's a bad default

cerulean knoll
#

does 0 default to 100khz deeper under the hood?

wraith current
#

@north stream thanks for the validation

fervent roost
#

anyone know how set boundaries/margins with the gfx's print method? I'm trying to print some text on a screen but the text reaches the right most edge before it wraps, I would like it to wrap before it reaches the end

deep tendon
#

Do you guys happen to know of any instances when trying to display a gif from AnimatedGIF library on a mini TFT screen where it doesn't display unless connected to a serial monitor? It's so weird like when I turn on the RP2040 without being connect to my comp it doesn't boot up. But when connected and outputting to the serial monitor it does. Wut??

north stream
#

Some code waits for the serial port to be ready before starting: code like this will hang forever if the port isn't connected. I've been bitten by this more than once.

pine bramble
#

Most of my projects blink an onboard LED or RGB until I start a telecomm program like hyperterm or putty and connect to it. ;) That way I can plug it into USB and see it's doing something predictable, without starting the terminal.

quartz furnace
#

Hello everyone….. I’ve been tinkering around with audio on an ESP32-S3….. I know about I2S breakouts … what I’d like to also experiment with is a breakout like this one ?

#

I take it that’s more for a board with a DAC pin? And while the ESP32 has a DAC , it’s no longer on boards like the ESP32 S3

#

Of note: the quality of the audio is not very important (I don’t think) I just want to play mp3 of Audio voice recordings, small maybe 5 seconds

quartz furnace
#

More about the project… create a MP3, use a File to hexadecimal conversion tool. Have that HEX Within the sketch …. Have some pin assignment to connect the above STEMMA Speaker into … possible?

quartz furnace
warped junco
edgy ibex
#

How much ram does the ESP 8266 feather have? Specs say 4MB of Flash, but no mention of ram. In particular does it have enough to run a strand of 250 neopixels using the Adafruit_Neopixel arduino driver?

north stream
heavy star
#

I did a Google for the ESP8266 in general and saw several say 16KB, but a couple said 48KB and 64KB

pine bramble
#

;) Not sure how you'll resolve this one. ;)

heavy star
#

I dunno how to code it, but I guess you could write something that allocates RAM in chunks and ramps up, printing the size/RAM usage to the console, see where it stops?

pine bramble
# 
3ffe8000 14000 + . 3FFFC000  ok
14000 decimal . 81920  ok
heavy star
#

80KB? weird

north stream
#

There are some debug utilities that can report free RAM available. How much RAM the pixels take depends on how they're used, and if there's other stuff going on (WiFi, for instance), that will eat up a bunch of RAM as well.

heavy star
#

Might want a co-processor

pine bramble
heavy star
#

Maybe 64 and 16

pine bramble
# 
Gforth comes with ABSOLUTELY NO WARRANTY; for details type `license'
Type `bye' to exit
# 
1 2* . 2  ok
1 2* 2* 2* 2* 2* 2* . 64  ok
1 2* 2* 2*   2* 2* 2* 2*   2* 2* 2* 2*   2* 2* 2* 2*   2*     . 65536  ok
1 2* 2* 2*   2* 2* 2* 2*   2* 2* 2* 2*   2* 2* 2*             . 16384  ok
# 
1 2* 2* 2*   2* 2* 2* 2*   2* 2* 2* 2*   2* 2* 2*  ok
1 2* 2* 2*   2* 2* 2* 2*   2* 2* 2* 2*   2* 2* 2* 2*   2*  +  . 81920  ok
#

I used to do them in a regular calculator. ;)

north stream
#

I still use the Unix bc tool for stuff like that

edgy ibex
#

@heavy star @north stream Thanks for the info.
Time to write a quick memory test sketch.
To provide some background, the app is already wriiten and running on an R-Pi, but I want to port it to Arduino. It's pretty beefy, and will use the WiFi, so I suspect 16K will be too tight. 64K or more and I should be OK though.

cerulean knoll
#

does controlling two neopixels require substantially more ram than controlling one?

#

as long as you're not keeping track of each pixel's state?

pine bramble
#

Well you could use an algorithm that decides what colors to display on what pixels.

#

But 'images' are presumably 'data'.

#

So you could have a 'spirograph' complex geometry on display, that was entirely driven by a few well-written lines of code. Relatively few, anyway.

cerulean knoll
#

Or maybe get commands from a server

spark jasper
#

boa noite! alguém pode me da uma ajuda

#

?

#

uma dica, uma luz

pine bramble
#

@cerulean knoll Yeah definitely - just 'process' a serial stream (decode instructions sent using your own conlang)

spark jasper
#

good evening, can anyone help me,
I want to implement a Last Will of the feed, read the documentation and copied and executed the example code, after compiling it gives an error message from my serial

#

alguem pode me da uma luz ou uma ajuda?

#

can someone give me a light or help

#

?

manic jewel
#

@spark jasper can you post your source code or link to the example?

#

Also what microcontroller are you using?

spark jasper
spark jasper
manic jewel
#

Please post code in text. See #welcome first details.

manic jewel
#

@spark jasper in the future, remove you user name and password from code

spark jasper
native dagger
#

I'd delete your current post and repost

spark jasper
#

if i comment mqtt.will(WILL_FEED, "OFF"); the code runs and I transmitted it to the adafruit platform, more when I get rid of the error.

spark jasper
manic jewel
#

I am unfamiliar with MQTT. Hopefully someone can help.

spark jasper
finite zenith
#

Is there anyone that had problems with including HTTPClient.h file. I Do have a matrixportal m4 and the plan was to make an HTTP request to a url and print the value on rgb matrix. whenever i includes the header file, it says it cannot open the source file. Thanks guys

north stream
#

You may need to install the associated library

golden heart
worn palm
#

Hello. I'm trying to get circuitpython set up on a matrixportal m4 by following the instructions on this page: https://learn.adafruit.com/adafruit-matrixportal-m4/install-circuitpython

But when I try to drag the downloaded .uf2 file onto the MATRIXBOOT drive, I get this error. I have tried repeatedly, on several different matrixportal boards, and I can't get past this error. What is happening here? There seems to be no clear troubleshooting path.

image.png
Adafruit Learning System
Adafruit MatrixPortal M4

CircuitPython Powered Internet RGB Matrix Display

tardy iron
worn palm
#

ah awesome thank you!

#

I can delete and repost in there, if that's better

lament basin
#

I looking for a Xmas make and came across the ESP32 web radio projects. I have ESP32 boards and ili9341 TFTs and when poking around in my parts bin, I found an Adafruit Music Maker Shield (with amp). Can I just use this if wired up properly instead of the normal VS1053 breakout?

north stream
#

The Music Maker isn't hard to control, so it should be operable, it's not quite the same thing but would probably work for most purposes.

lament basin
#

I shall give it a try. Could save me £5 and a long wait for AliExpress 🙂

fickle seal
#

So what did you to to make it work? I think I have a similar issue.

#

Okay, switching MacBooks did. the trick for me.

runic quarry
fickle seal
#

I managed to fix it on a different MacBook.

tardy iron
#

early releases of macOS Ventura broke UF2; i think 13.1 should fix it for everything except some nRF boards (which will need a bootloader upgrade)

junior prawn
#

I recently tried to use the Adafruit metro m4 airlift wifi lite with the Arduino IDE, and the first code I uploaded worked fine, but now the board is not recognised by my computer, and when plugged in the only light turned on is the On light, and I am worried the code has overwritten the uf2 bootloader, as circuit python no longer works either. How do I get the board to work again? Thanks for the help.

leaden walrus
#

to check bootloader - try double pressing reset and see if you can get METROM4BOOT folder to show up

junior prawn
#

I got it to show up

leaden walrus
#

cool, so board and bootloader are ok

#

it's probably just the sketch itself. that can happen. sketch just gets in bad state and prevents soft resetting for new upload.

#

there's a trick. one sec. let me find link.

junior prawn
#

It worked! Thanks for the help. I reinstalled CircuitPython as well which fixed the issues I was having with that as well.

quartz furnace
#

Anyone know of a Windows / MacOSX App (preferably free) that takes MP3 / WAV and creates lines of numbers so it can play an audio sample ?

I’m looking to do a basic DAC audio test

north stream
#

There's the old Unix od command for one

inland gorge
#

if you're looking for a GUI, there's the Sample Data Export menu item in Audacity (https://manual.audacityteam.org/man/sample_data_export.html ) but it outputs a sample per line. I'd probably use Python's wave library and make a little custom script that output the .h stub in the format I wanted: https://stackoverflow.com/questions/2060628/reading-wav-files-in-python

Sample data export.html
Stack Overflow
Reading *.wav files in Python

I need to analyze sound written in a .wav file. For that I need to transform this file into set of numbers (arrays, for example). I think I need to use the wave package. However, I do not know how

quartz furnace
#

Thanks everyone!

#

Ughh I might just end up using actual mp3 files uploaded into SPIFFS

narrow thorn
#

Does adafruit release the demo code they ship their boards with? I got the esp32s3 tft feather and would love the code for the program it shipped with.

solemn cliff
#

or at least I think it is

narrow thorn
#

enough to give me the start I was looking for. Thanks I appreciate the help.

toxic totem
#

I don't really know if this is where this should go but my pi pico w and the pins for it arrived, are the short plug headers too short to fit into a breadboard?

livid osprey
toxic totem
#

I was just wondering, i haven't soldered them yet

#

Thank you

cerulean knoll
#

congrats on the pi 🙂

toxic totem
#

Thanks, still waiting on the day that the big ones are back in stock

toxic totem
#

Is it supposed to have any lights when it is first plugged in

#

Because mine doesnt

solemn cliff
#

no, with nothing running on it, it does nothing, you plug it with the boot button pressed to get the bootloader drive and install stuff on it

#

it doesn't have a power LED

toxic totem
#

Oh, ok

vernal thistle
#

Hello. For some reason, the lights on my arcade buttons aren't working.
I am using the code in this tutorial: https://learn.adafruit.com/adafruit-led-arcade-button-qt/arduino (i am using arduino uno rev3 instead of metro)
I think it is the analog write part ss.analogWrite(PWM3, incr); in the looped if statements that is not working
All my wires are working

north stream
#

Are you getting the button presses?

vernal thistle
north stream
#

Huh, that means it has power and I2C communications are working. The code should count up incr while you hold down the button so it fades up. I suppose you could try something like ss.analogWrite(PWM3, 128); to see if it works with a fixed value.

vernal thistle
north stream
#

That implies it's either the analogWrite() function that's failing, or a connection problem between the board and the buttons/lamps.

gaunt owl
#

Hello everyone. I have a nephew thats around 10, and I think would really enjoy and benefit getting into learning how to use an Arduino. Anyone have recommendation for a kit for that age?

stable forge
gaunt owl
stable forge
#

Circuit Playground Bluefruit has more memory and does Bluetooth, but is missing a couple of things (audio is not quite as easy due to lack of a DAC)

gaunt owl
#

Thank you! I greatly appreciate the suggestions!

#

I was hoping for them to learn how to wire components on a breadboard as well. Like a kit with jumper cables, LEDs, servos, motors, etc.

#

They have a knack for coding and they love legos, so I thought I could gift them something to incorporate into their legos and apply their coding skills

stable forge
#

will drive lots of servos or motors; buy those separately

gaunt owl
#

Thank you I appreciate it! Its going to be a late Xmas gift 😅

upper grail
safe shell
leaden walrus
#

could recreate it pretty easily with a couple of external resistors set up as voltage divider. that's all the feather is doing.

image.png
upper grail
#

Thanks, I'm out of gpio on the Trinket but may experiment with that!

cerulean knoll
#

Would presumably have to be an analog pin too?

thick marlin
#

Hello , nema17 stepper motor dont work with l298n . Also I use arduino mega. I tried everything how can i solve this problem

north stream
gaunt owl
north stream
# gaunt owl Oh I actually wasn't aware. Any at the top of your head by chance?

AdaFruit products 3815 (Lego compatible bracket for TT style motor), 5287 (Lego robotics HAT), 4252 (micro servo adapter for Lego cross axle), 3810 (TT motor to cross axle), 4887 (Lego compatible mounting board for Micro:Bit), 4490 (Lego enclosure for Arduino), as well as stuff for more advanced stuff like 4434 (EV3/NXT Lego sensor/motor/controller jack)

gaunt owl
north stream
#

Heh, I did

livid osprey
mighty maple
#

how can i burn the bootloader to an atmega328? (notice the absence of the p) with an arduino mega?

gilded swift
#

if it was the P, you could do that easily with Arduino

tardy iron
#

i think the 328 and 328P are compatible enough for the same bootloader to work. (the main differences are with "pico" low-power stuff)

north stream
#

Yeah, the "Arduino as programmer" should work with a Mega (but I think the SPI pins may be different, so the hookup would have to be modified to match)

mighty maple
mighty maple
#

is it possible to burn the bootloader with avrdude?

tardy iron
sick mural
#

any way to shorten this code? if (digitalRead(C1) && digitalRead(C10) && digitalRead(C25) && digitalRead(S1)) {eepromClear();}

cedar mountain
#

Probably not easily in C++. In Python you could doif all(digitalRead(pin) for pin in (C1, C10, C25, S1)): eepromClear()

narrow thorn
#

I'm trying to compile for the esp32s3 feather tft on PlatformIO/arduino and it is complaining about particians.csv not existing.. anyone know where you get that from?

cerulean knoll
#

you could put the pins in a vector

sick mural
sick mural
sick mural
narrow thorn
#

it's the demo of the esp32s2 tft board

cerulean knoll
#

I forget what type pins are, but

bool allActive = true;
std::vector<int> pins = { C1, C10, C25, S1 } 
for( pin : pins ) {
    allActive = allActive && digitalRead(pin);
}
#

I'm sure there's some fancy functional programming way to map or collect the digital reads or something too

#

and avoid doing the for loop

#

I think maybe

std::vector<int> pins = { C1, C10, C25, S1 };
bool allActive = std::all_of(pins.begin(), pins.end(), [](int pin) { return digitalRead(pin); } );
#

some of this depends on what you mean by "shorter"

sick mural
#

Shorter as in condensed but easy to read

cerulean knoll
#

actually I wonder if you can just do

std::vector<int> pins = { C1, C10, C25, S1 };
bool allActive = std::all_of(pins.begin(), pins.end(), digitalRead);
#

and thus something like

std::vector<int> pins = { C1, C10, C25, S1 };
if (std::all_of(pins.begin(), pins.end(), digitalRead)) {
  eepromClear();
}
tardy iron
#

if they're all on the same port, you could bitmask them on a single read

cerulean knoll
#

oh that's a good idea too

sick mural
#

C1 is on port a but the rest are on port b so i can't

#

and i already sent out the pcbs so i can't change it

#

i'll stick with the if() statement for now

#

what do the std::vector<int> pins = { C1, C10, C25, S1 } and std::all_of(pins.begin(), pins.end(), digitalRead) parts do/mean?

mighty maple
#

i found minicore, a board library for the arduino ide and i was close to burning the bootloader, but:

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.03s

avrdude: Device signature = 0x000000 (retrying)

i selected the correct model of the processor, so idk whats happening here

sick mural
#

bad wiring or dead chip?

#

try double-checking the wiring

#

what chip are you using?

mighty maple
#

atmega328

sick mural
#

what programmer?

mighty maple
#

no p

#

arduino mega

sick mural
#

try this: avrdude -p m328 -c arduino and see what it says

#

wait nvm

cerulean knoll
sick mural
cerulean knoll
#

‘std::all_of’ takes the start of a container, the end of a container, and verifies that the predicate is true for all of them

#

It’s pretty similar to that python code

mighty maple
mighty maple
sick mural
#

i forgot a part

#

try avrdude -p m328 -c arduino -P /dev/ttyUSB0

mighty maple
# 
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

etc...

sick mural
#

do you have the cap on the reset pin on the mega?

mighty maple
#

no

sick mural
#

you need it

mighty maple
#

ok

#

what farad

sick mural
#

10uf or above

mighty maple
#

between which pins?

sick mural
#
  • on the cap goes to reset - to gnd
#

the reset pin on the mega NOT the target 328

mighty maple
#

alright i did it, same result

#

oh hold on

sick mural
#

np

mighty maple
#

yeah same result

sick mural
#

try swapping MISO and MOSI on the target

mighty maple
#

same result

sick mural
#

try avrdude -p m328 -carduino -P /dev/ttyusb0 -v and give me the result

tardy iron
#

is the target a bare 328 chip? is it at the same logic voltage as the mega?

sick mural
mighty maple
mighty maple
# sick mural try `avrdude -p m328 -carduino -P /dev/ttyusb0 -v` and give me the result 
avrdude: Version 6.4
         Copyright (c) Brian Dean, http://www.bdmicro.com/
         Copyright (c) Joerg Wunsch

         System wide configuration file is "/etc/avrdude/avrdude.conf"
         User configuration file is "/home/sirq/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/ttyACM0
         Using Programmer              : arduino
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xe0

avrdude done.  Thank you.
sick mural
#

hmmm

mighty maple
#

i saw something about tricking avrdude into thinking it has the correct device signature

sick mural
#

right now the mega and avrdude aren't working together

sick mural
#

what does ls /dev/tty* give?

mighty maple
sick mural
#

interesting

#

i guess it would fall under spam posting

mighty maple
#

yeah

#

but /dev/ttyACM0 is there

#

i can upload programs and everything but i cant burn the bootloader

sick mural
mighty maple
#

yes

sick mural
#

then you select arduinoisp as the programmer

mighty maple
#

arduinoisp or arduino as isp?

sick mural
#

arduino as isp (sry i misremembered)

mighty maple
#

yes

sick mural
#

reupload the arduinoisp sketch then try the bootloader upload with the arduino as isp programmer selected

mighty maple
#

yeah same error before

image.png
sick mural
#

the programmer is working now but we're back to the invalid signature

mighty maple
#

yeah

tardy iron
mighty maple
tardy iron
# mighty maple

why are the markings on the 328 illegible? are they readable to you at all?

sick mural
#

is the text on the chip clearly readable irl or is it just glare?

mighty maple
#

glare

sick mural
#

where did you get the chip?

mighty maple
#

jameco

sick mural
#

just checking for a fake chip

#

i'm pretty sure the arduinoisp sketch uses the SPI lines on the pins 11-13 (inclusive)

tardy iron
#

is it a fresh out of the factory chip? those are typically fused for an internal 8MHz oscillator, so the crystal might not be needed. also, double-check that the crystal housing isn't shorting to the capacitors

mighty maple
sick mural
mighty maple
#

i saw that the 328 and the 328p were basically the same except for some power thing so -F should work but idk how to modify that in the ide

sick mural
sick mural
#

do you have 2 chips?

mighty maple
#

yeah

sick mural
#

try the 2nd one

mighty maple
#

ok

sick mural
#

don't change anything else

mighty maple
#

oh it works

#

bruuuuhhh

sick mural
#

sorry to break this to you but you probably have a dead chip

mighty maple
#

well at least i bought 2

sick mural
#

always buy a backup

#

that's why when i only needed 1 board but the minimum pcb count was 3 i ordered enough parts to make 3 boards so if i mess up or something breaks i have a backup

mighty maple
sick mural
#

R.I.P atmega328 august 2022 - december 2022

mighty maple
#

so if im correct the 328 should have optiboot?

sick mural
#

there's a version of optiboot for almost every atmega avr chip

mighty maple
#

i mean the physical chip now has optiboot installed

sick mural
#

ok good

mighty maple
#

im asking if "burn bootloader" just burns the arduino bootloader

sick mural
#

the arduino bootloader is a variant of optiboot and completely compatible

mighty maple
#

ok

sick mural
#

minicore comes with optiboot the arduino bootloader is used for boards listed under the arduino avr section

mighty maple
#

ok

#

so could i hook up my ftdi cable to the 328 and upload programs?

sick mural
#

yes

#

tie CTS to gnd and connect RTS/DTR to reset through a 0.1uf ceramic cap

#

one of your 0.1uf filter caps will work

mighty maple
#

alrigbt

frigid osprey
#

Trial and error goes crazy

mighty maple
#

i just realized my eeprom programmer supported the atmega328 which couldve avoided basically every problem i had :P

sick mural
#

oof

#

main.cpp gets the extern variables but functions.cpp doesn't

#

i'm using PlatformIO

#

functions.hpp is in "include" while functions.cpp is in the "src" directory like it says

woven lintel
#

Hey! I just received my new M4 Express Airlift lite board and attempted to use it with the Arduino IDE and think I messed something up. I attempted to upload an Arduino example and i received an error. The board no longer shows the glowing RGB light. Could this be because the board came with CircuitPython? Do I have to reflash it? If so, how.

solemn cliff
#

oh my bad wrong board

#

what happens when you double-click reset then ?

woven lintel
#

RGB led lights up

#

Just tried it

solemn cliff
#

green ? red ?

woven lintel
#

green

solemn cliff
#

so then you are in bootloader mode (and a BOOT drive should show up - does it?)

woven lintel
#

Yeah. I'm on OSX and I see "ROM4BOOT"

solemn cliff
#

you should be able to program it in that state

woven lintel
#

How do i get it back to the CircutPi drive

solemn cliff
#

and once an Arduino program that works is installed you shouldn't need to put it in bootlaoder mode

#

for that you need to install Circuitpython with the matching UF2 for your board, Circuitpython is overwritten when you write an Arduino program to the board. There are ways to add to your Arduino program that drive feature if you want to, but that's a little beyond me

woven lintel
#

Ok awesome. So what did i do to get it out of boot mode?

solemn cliff
#

what did you do ? I don't know 🤷

woven lintel
#

LOL true. So in the future. double clicking reset can put it into boot mode. And from there I can write with Arduino IDE or reinstall circuitPy.

solemn cliff
#

yep

woven lintel
#

Awesome. Thanks! I appreciate your time and help!!!

solemn cliff
#

once you have an Arduino program on it you shouldn't need to go into bootloader mode unless the board is in a state where the code is crashed or stuck or something, Arduino uses a trick to reset boards into bootloader mode by connecting to their serial port in a particular way, so if there's no serial port because the code is crashed, it won't happen

#

unless there is a config required that I don't know (I believe that on ESP32S2 you can chose to activate the CDC or not for example)

cerulean knoll
#

At the risk of doing unsolicited code review, it might be more readable and maintainable to do

void readButtons() {
  //read the buttons
  int to_add = 0;
  if (digitalRead(C1)) {to_add = 0.01;}
  if (digitalRead(C10)) {to_add = 0.10;}
  if (digitalRead(C25)) {to_add = 0.25;}
  if (digitalRead(S1)) {to_add = 1;}

  money = money + to_add;
  oldTime = time;
  ledblink(100);
}
#

Factoring out the shared portion of the if statements

#

Although consider what you want to happen if multiple digital inputs are high. Like if both C25 and C1 are active, only the C25 case will have an effect. Maybe that's not what you want, I don't know.

#

I'm also a bit confused about the usage of the extern keyword? Wouldn't it be more typical to not initialize the extern variables, since the point of extern is to say to the linker "this variable is in a different object file"? Maybe I am missing something.

#

like:
foo.hpp

extern int my_integer;

foo.cpp

int my_integer = 0;

main.cpp

setup() {
  do_something_with(my_integer); // Because we included foo.hpp, it's ok that this data is in foo.o
}
cedar mountain
cerulean knoll
# 
ahepp@dev:~/ws$ cat my_extern.h
extern int my_extern;
ahepp@dev:~/ws$ cat my_extern.c
#include "my_extern.h" // not strictly necessary I suppose
int my_extern = 100;
ahepp@dev:~/ws$ cat main.c
#include <stdio.h>
#include "my_extern.h"

int main() {
    printf("my extern: %d\n", my_extern);
    return 0;
}
ahepp@dev:~/ws$ 
#

prints 100

sick mural
#

i'm new to multiple files so thx for the help

cerulean knoll
#

No problem! It can be tricky with C/C++

sick mural
#

yes

sick mural
cerulean knoll
#

SInce you set it to zero at the start of the function, wouldn't you be OK?

sick mural
#

oh yeah that would work

cerulean knoll
#

This is also one reason people generally recommend against using global variables. When a program is small they work OK, but it can make it hard to reason about stuff like taht

#

I'm also not sure the line:

extern unsigned long time = millis();
``` is going to do what you expect
#

I don't know if that will even compile tbh? I'm not sure if you can initialize a global variable with a function call

#

if it compiles, it will only call millis one time at the very start of the program

sick mural
#

i'm more used to the arduino style of multiple files where it concatenates them all then compiles that

cerulean knoll
#

Oh yeah you mentioned you're using platformio now?

sick mural
sick mural
cerulean knoll
#

I would argue that the read button functions should not do anything with the time

#

I think it would make more sense for the main function to update the time in its loop. Then you don't need a global variable

sick mural
#

good idea

cerulean knoll
#

You said you made a PCB for this?

#

sounds exciting!

sick mural
cerulean knoll
#

when do the parts arrive?

sick mural
#

it's also in the repo

sick mural
#

5 days early

cerulean knoll
#

2023 getting off to an exciting start!

sick mural
#

yes

#

for me it's still 2022

#

i have the time variables as global because i use them in multiple functions

#

one problem i have right now is i can't get functions.cpp to run

cerulean knoll
#

what error are you running into?

sick mural
#

i have a function (lets call it foo()) defined in functions.cpp, functions.hpp says foo() is undefined, main.cpp gives an error saying "foo() is undefined"

cerulean knoll
#

Is foo declared in functions.hpp?

#

I'm looking at the code so you can use the real error messages haha

sick mural
#

yes

cerulean knoll
#

is it eepromClear?

sick mural
#

it's ledBlink()

#

i've added a few commits

cerulean knoll
#

got 'em

#

(can't compile it because I don't have the arduino libs installed)

#

but I can see the source 🙂

sick mural
#

nice

#

it's just the stock platformio in vscode install

#

that's how i'm commiting

cerulean knoll
# 
               
  if (add = 1) {```
#

this is a famous C footgun

#

gotta use 2 equals signs for comparison

#

in readButtons

#

that will compile, but it will set the value of add to 1

#

(and be "true")

#

it looks like you have ledblink defined in two places?

#

main.cpp and functions.cpp?

sick mural
#

forgot to recomment those from testing

cerulean knoll
#

oh we should probably thread this

sick mural
#

yeah

north stream
north stream
sick mural
#

we got it working 🥳

sick mural
cerulean knoll
#

the compiler seemed to ignore the extern. It did generate a warning

north stream
#

I'm not surprised, but not for the reasons stated earlier

sick mural
#

software can be weird sometimes

#

but after some help from @cerulean knoll (thx) we got it working

cerulean knoll
#

(which I guess makes sense, if I tell the compiler "look for this data outside the object file, but also here's its value" I suppose the least-insane thing to do is store that value in the object file)

sick mural
#

yeah

sick mural
cerulean knoll
#

yeah pretty much. It wasn't bad enough to cause an error, but it could tell you what you were doing didn't make a ton of sense

#

99.9% of the time, those warnings are worth paying attention to 🙂

woven lintel
#

Does anyone have experience with the Metro M4 Express with Airlift lite? I'm attempting to connect to adafruit.io and followed the board setup (Installed wiresnipper, downloaded the prefilled secrets.json..etc) but am not having luck. the board cycles through and restarts over and over

hollow sage
#

Hey Im new to using adafruit and mostly all of this in general. I'm trying to use the Audio FX Sound Board attached to an arduino mega, and my goal is to play a 30hz wav file consistently with a button, and when let go of the button for the audio file to stop. I was reading some of the documentation and found that in order to use some of the filenaming features like LATCH and HOLDL, the mode needs to be set to GPIO mode. What does this exactly mean, and how would I go about doing this? I've been using the menucommands.ino example in the arduino ide to test everything

I'm not exactly sure what "Pulled high for default GPO trigger mode" means, but when I remove the wire that connects UG to ground, none of my audio files show up in the menucommands program

sly bough
#

Hello, I am new here. I've got Adafruit's VL53L4CD that i would like to connect to a nano board with SPI OLED which i already got (not adafruit oled..). where can i fetch a test code to try out? my OLED and NANO are already working for a weather station. i would like to load a test code to read VL53L4CD on that same oled:

2.42" OLED Display Module
Driver SSD1309

north stream
north stream
sly bough
sly bough
hollow sage
# north stream "Pulled high for GPIO trigger mode" means that by default, that pin is connected...

Thanks for the explanation! So I took out the wire that grounded the UG pin, which I'm guessing puts the board in GPIO mode, and the menucommands program can't use it if it is in GPIO mode. How would I go about using the sfx.playTrack() while in GPIO mode, would I need to change some of my code around or other wires around?

I was initially just taking this code from menucommands into a new program and trying to use sfx.playTrack((uint8_t)0); and see if it would latch, but it does not seem to play in GPIO mode with what I currently have.
*To clarify I tested my code in UART mode with it working again, but without the latch of course, so my guess is I tried using code meant for UART mode?

image.png image.png IMG_4602.png
edgy ibex
#

If I want to drive 200 to 300 neopixels, I should be fine with an ESP32 S2 Feather using Arduino, correct? I'd like to stick with ESP chips since WiFi is a "must have" for this project, and Feather format is also very attractive because of the built in li-poly battery support. Or to put that another way, what's the ram usage (not including my own buffer) per Neopixel of the Adafruit_Neopixel driver.

cedar mountain
narrow thorn
#

I have a esp32s3 feather tft that I keep overwritting the bootloader.. does anyone know the partician.csv layout to use in platformio to not overwrite the bootloader?

narrow thorn
#

anyone?

#

Perhaps you can just use platformio to build a binary.. then convert the binary someohow into a uf2?

#

or is there a way to make a combined binary with uf2 that you can just overwrite it all with?

gilded swift
narrow thorn
#

do you know where that is at?

#

every time I use platformio I blow away the uf2 system on the esp32s3 tft.. just like Kattni warns.. but she doesn;t mention how not to do it 😄

solemn cliff
#

or the tinyuf2 repo

#

and you can convert a bin into a uf2, giving it the start address or something

wide shadow
#

Is there a way to read the current pixel states on an Adafruit TFT display?

gilded swift
wide shadow
gilded swift
wide shadow
#

Main reason I want to do this: I want the pixels on the TFT to mirror pixels on an HTML5 Canvas.

gilded swift
#

There might be other libraries out there that do it

raw dew
#

Having issue with flashing a bootloader. Would it be alright to ask for help here?

gilded swift
raw dew
#

It's a nice!nano (sorry I can't help more than that).

raw dew
gilded swift
#

You need either of listed devices (st-link or jlink)

tardy iron
raw dew
#

Using Windows 10.

gilded swift
#

Oh yeah that too

#

You might need to have a WSL instance or vm with access to your physical ports

raw dew
#

In all honestly a lot of this stuff is way beyond my head. I just make my custom keymaps via qmk (and zmk) now.

tardy iron
#

it's looking like adafruit-nrfutil isn't ending up in the PATH for some reason. i'm not sure where pip on Windows puts things

raw dew
#

That's what I thought to but it should be mapped to my environmental variables

tardy iron
#

i'm not familiar with Python on Windows, so you might have to wait for someone who knows that better

raw dew
#

No worries. Appreciate you trying to help.

tardy iron
raw dew
#

I gave that a try on windows but it would keep crashing

#

I'll give it a try on osx and see if that works.

#

@tardy iron So actually got that to work by starting it from terminal

#

However getting this error now

Error: Got unexpected extra argument (115200)

tardy iron
raw dew
#

Sure:

adafruit-nrfutil --verbose dfu serial --package nice_nano_bootloader-0.6.0_s140_6.1.1.zip -p COM5-b 115200 --singlebank --touch 1200

tardy iron
raw dew
#

This is still on windows

#

Sorry didnt mean terminal....mean cmd

#

my bad

#

@tardy iron you are awesome!!

#

Never in a billion years would I have noticed that spacing issue...and given that entire command looks like ancient Egyptian to me, I would never even know to look for something like that!

tardy iron
raw dew
north stream
#

One of the old ones was the "System V Interface Definition" (SVID), which is the single-dash, single-letter arguments with values. That command also sports some of the Gnu style double-dash full word ones.

tardy iron
#

yeah. in practice, a lot of Unix-lineage command-line utilities use the getopt API or the GNU extensions to it, which leads to the style that madbodger was talking about. DOS-style commands use / to prefix options, which dates back to CP/M (and incidentally is probably part of why DOS uses backslash instead of forward slash as directory separators)

brazen falcon
#

Yeah, CP/M didn't have directories proper, only "user numbers" which were kind of directory-like.

raw dew
#

See. This is what I mean by all of this is so far beyond my understanding that I wouldn't even know where to begin.

#

Just have to be thankful for communities on reddit and discord.

elfin gazelle
#

Didn´t do anything with an arduino for a while but had it set up already on my fedora machine. Today I wanted to do something with arduino but can not make it work. Don´t know what changed, maybe because I updated to Fedora 37? But When I use the Arduino IDE it says it

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

I have selected the right board and port and also tried with different USB cables and with two different boards that I have. Also used the old Arduino IDE and the new one. And I also had it set up in VS Code some time agaoand did install the arduino-cli, which worked fine. But the VS Code Arduino extension says now that the path to the cli is not right. Anyone knows what I can try?

leaden walrus
#

double check the board being selected in the IDE

elfin gazelle
#

Yes it's the Arduino Uno. There are some lights going on when I click upload. Trying it with the blink sketch.

leaden walrus
#

anything useful in dmesg when the board is plugged in?

elfin gazelle
#

what is the dmesg?

leaden walrus
#

linux command line tool to print kernel messages

#

can do something like:
dmesg -w
and then plug in board and see if the messages have anything useufl

elfin gazelle
#

I was using a atmega chip that had no bootloader installed or so. I got confused with my atmegas. but I am wondering, how could I use a blank atmega for an arduino? Do I have to go on burn bootloader? Cause that failed with the atmegas I was trying it with

tardy iron
tardy iron
leaden walrus
#

it'll need a bootloader to be able to receive uploads via Arduino IDE

tardy iron
#

i think there might be a way to configure the Arduino IDE to upload sketches via SPI programmer, but that's probably advanced stuff and might require tweaking board definitions

elfin gazelle
#

they are all atmega328P . I have one that is working and two that dont. I dont know which one is the one that was preinstalled on the arduino board. maybe the one that I can upload sketches on. With the other Atmega chips I get avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00 but also cannot burn the bootloader.

tardy iron
elfin gazelle
#

I put the "blank" atmega into the arduino board and then I tried it with all the prommgers that I could select and pressed burn bootloader from the arduino ide

tardy iron
elfin gazelle
#

Ah okay! Thanks!

rigid brook
#

Hi all, can anyone point me toward a good source for information on creating a basic machine learning program? Looking to run it ideally on an M0 QTPY and arduino as the sensor I’m using doesn’t have a circuit python library

gilded swift
#

It’s on Coursera I believe

rigid brook
#

Will do, thanks!

sick mural
#

do local variables in a loop carry to a subroutine?

void loop() {
  float value = 182; //the number i want to carry
  foo(value);
}
void foo(float bar) {
  Serial.print(bar); //would this work?
}
spark oar
#

Yes, it would work because it is passing the value from loop() to the foo() function.

sick mural
#

if i change the value in the subroutine will that change carry back to loop()?

spark oar
#

Nope. The value is passed by reference. You would need to create a global variable, outside of loop() or foo(), or pass value by value.

sick mural
#

thx

#

so the change would be reverted when the subroutine exits

spark oar
#

Oops, sorry, I had reference and value reversed.

sick mural
#

does that change the outcome?

spark oar
#

That is correct. Prefix your bar parameter with an & to pass by reference (i.e., float &bar). That should allow you to change the value within the foo() function.

sick mural
#

thx

#

so void foo(float &bar) {}?

spark oar
#

Correct.

leaden walrus
# 
void foo(float bar) {
  bar = 23;
}

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

  float value = 182;
  foo(value);
  Serial.println(value);
}

void loop() {
}

outputs:

182.00
# 
void foo(float &bar) {
  bar = 23;
}

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

  float value = 182;
  foo(value);
  Serial.println(value);
}

void loop() {
}

outputs:

23.00
spark oar
#

Great!

leaden walrus
#

and via pointers for comparison

void foo(float *bar) {
  *bar = 23;
}

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

  float value = 182;
  foo(&value);
  Serial.println(value);
}

void loop() {
}
spark oar
#

@leaden walrus, now your just showing off. 😁

sick mural
#

what's the * mean?

sick mural
cedar mountain
# sick mural what's the * mean?

That's an indicator that bar is actually a pointer to a float, i.e. it has type "float*". Then you can dereference bar to access the thing being pointed to by using *bar.

sick mural
#

dereference?

native dagger
cedar mountain
cedar mountain
sick mural
#

so it allows you to see what's a pointer and what's not at a glance?

cedar mountain
sick mural
#

oh that makes sense

#

i do wonder what happens when you increment the pointer itself

cedar mountain
sick mural
#

so if the thing isn't an array i can see how that could mess a bunch of stuff up

cedar mountain
#

Yep, exactly. Pointers and memory management in C is a huge source of potential bugs and security holes for reasons like that.

sick mural
#

you could use it to gain A.C.E which can be very bad

cedar mountain
sick mural
#

makes sense so if all of the memory space was floats it would increment to the start of the next float or 4 bytes ahead

north stream
native dagger
#

There go my plans for peace on earth!

cerulean knoll
#

I prefer to think of pointers as types, which kinda suggests the float* var notation. But unfortunately float *ptr, val is a thing

#

that is:

# 
float *ptr, not_a_ptr;
#

so to avoid

float* ptr, misleadingly_not_ptr

I generally stick with float *var

tardy iron
cerulean knoll
#

although really I've just started clang-formatting everything

#

I'm beginning to think this C programming language might have a couple design flaws!

tardy iron