I used an Arduino Uno, IR remote, IR receiver, Laser Diode and two servos to create an IR remote controlled laser cat toy.
WARNING!Lasers can cause permanent eye damage, ensure that you follow these safety measures:Only use a low-Wattage laser i.e. 5mw or less.Never shine a laser at a reflective surface.Never shine a laser in to anyone's eyes i.e. Cats, Dogs, Jedi's, Humans etc.
Don't forget, cats can get easily frustrated when playing with a Laser as they can not actually catch it. Make sure you switch over to a toy they can catch.
Wiring Schematics:
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