My daughter came home with a 'spy gear' item from a fastfood restaurant. When you switch it on, it starts beeping when people walk in front of it. Even when they are about 6 feet/2 meter (or a little more) away. The sensor seems to be some kind of led. Can anyone tell me what kind of led this is? …

What kind of led is used in...

weirdo557 November 16, 2008, 10:55pm 2

i would wager that its an infrared emitter/detector pair, like this

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