Arduino Stack Exchange Community Digest

Top new questions this week:

ESP32DevkitC-V4 interfacing ADS8698 (18 bit ADC)

I am currently working on an SPI interface to measure the voltage of an amplified sensor bridge signal. I am using an ESP32 module to control the device. Since I am logging the data to an SD card, I …

esp32 spi adc

asked by Dexter S Score of 2

Direct port manipulation takes 300 nanoseconds to execute for some reason

I have this code #include <Arduino.h> void setup() { DDRD = B00001000; } void delayNanoSeconds(int time){ int ans = (float)time / 62.5; for(int i = 0; i < ans; i++){ …

arduino-uno

asked by Abdrlrahman Score of 2 answered by Edgar Bonet Score of 5

Arudino receiving interrupt command BEFORE entering sleep mode causing it not to receive any interrupt commands in order to wake up

I’ve written code for an Arduino Nano that when a button is pressed, it sends an IR command. It is set so that if no button press has been received for a period of 10 seconds, it will enter sleep mode …

arduino-nano interrupt timers sleep

asked by 99natmar99 Score of 2 answered by Edgar Bonet Score of 2

Lilygo T-Wristband code not working (DRV2605 Motor version)

I am new to this and I have purchased the Lilygo T-Wristband to prototype a watch that will vibrate upon receiving a 1-bit bluetooth signal from an android app. The goal is to allow the user to set …

esp32

asked by gvk Score of 2

Passing function as argument, with capture, what type to declare in function?

This probably has a simple resolution, but can’t find the right combination. I’m trying to setup a function (setupScreen) to take as an argument a function to do the actual setup: void ScreenHelpers::…

c++

asked by Snappawapa Score of 1 answered by Edgar Bonet Score of 2

Greatest hits from previous weeks:

What is an ICSP pin?

What is an ICSP pin? I have read that it is an AVR and a tiny programming header for the Arduino, but what is an AVR and what does an ICSP pin do?

arduino-uno pins

asked by SpaceMonk Score of 14 answered by James Waldby – jwpat7 Score of 23

How to make a 5-volt relay work with NodeMCU?

I have hooked up 2 channel 5-volt relays with NodeMCU v1.0 as shown in the fritzing below. Relay are powered with a different power source than NodeMCU. As of now, I am powering the NodeMCU from my …

esp8266 relay nodemcu

asked by Ciasto piekarz Score of 6 answered by dandavis Score of 8

How can I create multiple running threads?

Is there a way I can have multiple parts of the program running together without doing multiple things in the same code block? One thread waiting for an external device while also blinking a LED in …

arduino-uno threads

asked by Bja Score of 74 answered by sachleen Score of 60

Error opening serial port 'COM1'. (Port busy)

Im using the arduino Micro pro to read the data out of a temperature sensor (lm35). The program is compiling and NOT uploading, but when I try and open the serial monitor is says: Error opening serial …

arduino-pro-micro

asked by M. Shaaban Score of 2

What's the difference between analogWrite and digitalWrite?

As the title states. What’s the difference between the two? analogWrite(pin,0-255) vs digitalWrite(pin,LOW-HIGH)

digital analogwrite

asked by pijemcolu Score of 8 answered by TanyaV Score of 18

How do I erase the memory of the Arduino Uno?

I’m just a tinkerer learning Arduino with my son and I was surprised that when I plugged the USB cord back in to the Arduino the program was still running and I thought to myself, “it’s a good thing I …

arduino-uno safety flash

asked by Peter Turner Score of 15 answered by Manishearth Score of 15

“stray '/302' in program error” when compiling

For some weird reason, the following code doesn’t compile. I get a “stray ‘\302’ in program” error around volatile unsigned int encoderPos = 0;, and I have no idea what the issue is. I’ve been trying …

programming arduino-ide sketch compilation-errors

asked by user2950509 Score of 5 answered by Ignacio Vazquez-Abrams Score of 7