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Thread: how to filter surounding light
www.piclist.com/techref/logic/dsps.htm?key=filter
picon face BY : Eric Naus email (remove spam text)



What you want to do is modulate the light at a certain freq. and then
 look for a response at that freq. That way ambient light will have little
effect.
There are many projects on the net that show how this is done.


Good luck and have fun :-)


Eric

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