Thread: How To Question: Illuminate LED on passover?
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Unread 27-07-2006, 18:36
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Re: How To Question: Illuminate LED on passover?
You could use a photo voltaic cell on the spot that you want to know if the arm is over and a LED attached to the moving arm. When the arm moves over the photo cell it will create a current which you can use to power the LED that you want to turn on.