Pimoroni RGB keypad blinks in random colors
Start with:
https://github.com/pimoroni/pimoroni-pico
https://github.com/pimoroni/pimoroni-pico/blob/main/setting-up-the-pico-sdk.md
Edit demo.cpp in folder: ~/pico/pimoroni-pico/examples/pico_rgb_keypad
Compile with "make" in: ~/pico/pimoroni-pico/build/examples/pico_rgb_keypad