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-   -   Thwart robbers with an old smoke alarm (http://www.madshrimps.be/vbulletin/f22/thwart-robbers-old-smoke-alarm-70396/)

jmke 1st March 2010 16:09

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.
http://hackaday.com/2010/02/28/thwar...d-smoke-alarm/


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