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9volt said:I would like to build a device that would shoot a laser on an object (within 1-2 feet) and when that object is moved, it would send an RF signal to a nearby reciever. Can this be done? Thank you
The Mad Professor said:In a nutshell.. hmm.. yes, it can be done.
Laser diode module>>>> reflector>>>>>Phototransistor detector
RF transmitter and reciever circuits are common enough as well,
for a quick build I would use ready made RF modules.
The Mad Professor said:Depends on the object, just what exactly do you have in mind ?