Quote:
Originally Posted by ccyg8774
Don't have to be a solar panel (unless you really want to power it by sun), you can get a Photoresistor (they are really cheap) and a door alarm activated by vibration (they are cheap, too). Simply replace the switch with a Photoresistor will make it activate by light.
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You could use a red filter to filter out other colors of lights and use a red laser to trip it as well, so that random flashlight wouldn't trigger it.