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Oct 30, 2020 at 22:57 comment added Cam.Davidson.Pilon Thanks for the ideas - lots to test out. My 3.3V supply voltage is from an RPi, that powers the ADC and LED, and from what I've read, it's pretty stable. I'll investigate the photodiode, too. The copy idea sounds near-ideal, but that would mean the LED is the culprit, right?
Oct 30, 2020 at 22:27 history answered Jeremy Willden CC BY-SA 4.0