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

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

This repository has the code to go with my video: https://youtu.be/2uuutrcaAZ0 Measuring very low capacitance value changes (down to 10s of fremtofarads) by toggling output lines on a Pi Pico and timing how long it takes for the line to transition from 1 to 0 using the PIO state machine. This is able to detect capacitance changes just from changes of my proximity to the electrode. The way this works is that the output line is driven high for a few microseconds, then switched to an input, with the Pi Pico's internal pull-down enabled, and then timing how long it takes for the input to read…

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