Jesper PoulsenApr 24
Kevin Santo Cappuccio
Man, PIO is so ridiculously OP.
Apr 23 at 8:50pmWeb
Show threadKevin Santo CappuccioApr 23

This is just copper pads hooked up directly to gpio, and PIO state machines reading tiny changes in capacitance... without any "real" analog circuitry.

(Credit to Matthias Wendel, I stole his pico-femtofarad code and made it into a 3D gesture sensing thing.)

https://github.com/Matthias-Wandel/Pico-femtofarad

GitHub - Matthias-Wandel/Pico-femtofarad: Relative measurements of very low capacitances using timing on digital I/O lines using Pi Pico PIO state machines

Relative measurements of very low capacitances using timing on digital I/O lines using Pi Pico PIO state machines - Matthias-Wandel/Pico-femtofarad

GitHub
Show threadKevin Santo CappuccioApr 23
This was my super janky setup just to check if it would work at all
Show threadcaramel beurre salopeApr 23
@ArchiteuthisFlux woah :0
nice

how resistant to RF is it?
Show threadKevin Santo CappuccioApr 23
@kouett idk, probably not very. It's such a noisy signal and there's a ton of filtering to get it there so maybe that would catch it too. As long as it doesn't line up with the read frequency.
Show threadLucie / minuteApr 23
@ArchiteuthisFlux pretty awesome! also love the fast updating TUI!
Show threadKai, sounds like the skyApr 24
@ArchiteuthisFlux thats ridiculous! How ?!