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I also did not understand this complaint. On a Pico, any GPIO can be used for touch (using PIO of course).

Example with 23 touch buttons if I counted that correctly:

Thanks for this! I am happy to have been wrong about the touch stuff, because I'm learning a lot.

The same user has also got a board with touch sliders, consisting of inversely tapering touch areas that allow to compute the touch position along the axis (same for rotary sliders that use three of these in a circle configuration).

https://github.com/todbot/picoslidertoy

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