Two Ways to Use an LED as a Light Sensor With Arduino

owl writes:

https://blog.jgc.org/2024/06/two-ways-to-use-led-as-light-sensor.html

I needed to log when a light switched on and off during the night as part of debugging an oddly behaving movement sensor. To do that I built a really simple light sensor logger using an Arduino Leonardo, a large LED and a resistor or three.

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