Firmware for a test 2x2 keypad to learn zmk
This is a test of the zmk build process for a 2x2 keypad on a breadboard using a Nice!Nano v2.
Columns 1 and 2 are connected to pin 8 and 9 respectively.
Rows 1 and 2 are connected to pin 10 and 16 respectively.
Diodes are used on the row connections.
Battery positive is connected to RAW.
Battery negative is connected to GND.
