A very simple op-amp comparator based circuit which switches red when the light level falls below approx 150Lux, and green when the light level rises above approx 150Lux. Please note, the light level trigger value is very rough, due to resistor tolerance, etc.
Schematics
NotesSorry, I can't remember the details of the op-amp except that it sources/sinks about +-8v |
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