This is a fantastic keypad! I'm using the UART pads on the PCB + MAX3232 level shifter to connect to my amateur radio transceiver. The transceiver can be managed using serial commands (CAT). I can use functions on the radio with the press of a button, that otherwise would be behind a function or menu knob.
I've uploaded the code here: https://github.com/git1k2/keybow2040-cat
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