Making reactive circuit board capacitive touch pads
On Mastodon, James Brown tests using circuit board touch pads, reading them via capacitive touch:
This worked well. 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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