Invisible alarm help!

Thread Starter

Chris15

Joined Apr 15, 2009
252
Hi
if you have put your hands under an electronic hand dryer you will know the circuit im talking about, a infrared LED when you interupt the signal it triggers something (in this case the dryer) how could i make a simple circuit, and how does it work?

Thanks guys
 

awwende

Joined Feb 17, 2009
39
I don't know if you have any programing experience, but you could use a micro controller like the Arduino or Basic Stamp and use a ultrasonic range finder so if an object is say 2cm or less away it triggers whatever device you plan on using
 
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