PRP 5 and 6 — Threshold and hysteresis
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The LDR divider from PRP 3, plus an LED the board switches on its own. PRP 5 and PRP 6 use exactly this hardware — only the code changes, which is the point: hysteresis is a software fix for a fault you can see.
Shared from Little Bird Electronics. Opens in Fritzing — this image was created with Fritzing, and its part graphics are CC BY-SA 3.0.