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Thwart robbers with an old smoke alarm
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Old 1st March 2010, 15:09   #1
jmke's Avatar
Join Date: May 2002
Location: 7090/Belgium
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Default Thwart robbers with an old smoke alarm

[Anders] tipped us off about his hack that re-purposes a smoke alarm as a burglar alarm. Unfortunately, he came home in the middle of a burglary but wanted to be ready the next time someone tries to break in. By cleverly patching into the test button on an old smoke detector he created a circuit-trip alarm. One side of each piece of wire is secured to the frame and jam of a window. A paper clip completes the circuit by pinching the two bare conductors. If the window is opened the connection is lost and the alarm sounds.
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