Making a responsive capacitive touch pad set with Raspberry Pi Pico #RaspberryPi @Raspberry_Pi
James Brown on Mastodon demonstrates making an array of capacitive touch pads on a circuit board. On reading the pads, the typical algorithm of polling was reversed:
The capacitive sensor works by discharging the pad through a resistor and timing how long it takes. Previously I was doing this a few thousand times in a loop and returning the accumulated time. Here I’m doing it the other way round – spending a fixed time in the loop, and counting how many charge / discharge cycles it can do. My aim was to make it easier to tune the sample period, but it turns out noticeably smoother and less noisy this way too.
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