The idea is to make GPIO proxy. The following description is in the context of its use in Hubitat/Smartthings ecosystem. The Arduino sketch take commands from serial port. As example of a command is ...

Enter the ExtraCore library for Arduino, a software library that turns two or more Arduinos into a multi-core microcontroller with more pins than you’ll ever need. The ExtraCore library comes ...

The Arduino is no exception to this trend ... and just a single LEDs on pin 13. One of the other features this board boasts over other small form factor boards is on-board USB-C, which is ...

steno_keyboard.ino: The original, separate pin for each key. Arduino Mega. mux_steno.ino: Second try, multiplexed. Arduino Micro, now modified to use Adafruit Itsy Bitsy and allow pin 8 to ground to ...