I'm having problems with using both HX711 scale library and Firmata library.
At first I used only StandardFirmata example sketch, uploaded on Arduino and my NodeJS app with Johnny-Five library worked and I was able to read and write to pins.
Then I added the HX711 library to the sketch and in the loop called the function to get current scale weight (scale.get_units()) and the NodeJS app didn't work anymore.
I got error Device or Firmware Error (A timeout occurred while connecting to the Board). I don't know where is the problem.
ArduinoFirmware.ino (29.5 KB)