This is a little code snippet that runs on Arduino to test continuity between it's own pins. Perfect to find matrix pinouts or other schematics.
It's important that the pin has internal pull-up resistors, otherwise you'd short the pins out and you could burn the controller.
Author: Martín Durán
If you use and like this program, consider buying me a 🍺 beer. You can donate via PayPal:
MIT
This program is free, but comes with ABSOLUTELY no warranty, a bad use of the program could lead to your board being destroyed.