Have you ever left your garage door open and have forgotten to close it? I have! In fact, once I left it open all night but fortunately nothing was stolen. So, I decided to make a gadget that would let you know that it was left open. What you need... 1. An old R/C car, plane or boat.2. A magnetic...By: Kipkay
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from Instructables: exploring - technology http://www.instructables.com/id/The-Garage-Door-Alert/
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