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# Light dependent resistors perhaps?
Or photodiodes in reverse bias?

sorry about the introduction of reality

relurk time
(I helped save b3ta! Gobfrey Shrdlu put his plans for world domination into effect on, Fri 2 Nov 2007, 19:37, archived)
# actually
LED's when correctly biased can act as photoreceptors

basically, on a red LED, you need aboout 0.7v of bias voltage to allow them to overcome the ............

anyways, sorry for the correction to the reality induction

(bleugh, Sat 3 Nov 2007, 13:12, archived)