Fangzheng LiuFound a similar project: https://github.com/truhlikfredy/SinglePinCapacitiveSense?tab=readme-ov-file
Seems like someone has already done this before :( ...
Found similar work :( ...
A project log for IO-touch: every IO pin is a capacitive sensor
Without any external components or capacitive sensor peripheral, any IO pin can serve as a capacitive sensor
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