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A comment on Raspberry Pi Pico Hack Unlocks Two Extra “Hidden” GPIO Pins. Parent comment

Re:Raspberry Pi Pico Hack Unlocks Two Extra “Hidden” GPIO Pins by explodingwaffle on Friday July 22, 2022 @06:43AM (#32190548)
The standard way to do it is just a square matrix, so yeah a lot of pins are required. There are cleverer ways though- I like this writeup https://kbd.news/Improved-square-matrix-1415.html
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