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I was thinking - if IR can detect colors
but . . . green light isn't IR light . . .
I really don't like using IR for the simple reason that it's hard to debug what you can't see . . .
If you want to be sure you're seeing green, you should use a photoresistor.
you could always use normal colour led's to also detect colours. It isnt a much used thing with led's but it does actually wok on an a2d port
but what color LED would I use to detect aluminum foil?