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Making an alarm for my door

Discussion in 'General Electronics Discussion' started by Pew446, Nov 19, 2009.

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  1. Pew446


    Nov 19, 2009
    Well, I have a router that lays in my room, and when my brother gets mad cause the internet is slow, he'll come in and start swearing at me for doing whatever I didn't do. And usually this happens at night; he wakes me up.

    I want to make an alarm so when he comes in my room to steal my laptop or.... whatever, I want a buzzer to sound. But I can't quite figure out how to make it sound when the door is opened... :/ Help would be nice.
  2. Resqueline


    Jul 31, 2009
    Oh dear..
    Sounds like you need a high-voltage zapper on the doorknob instead of a buzzer that will just wake you up anyway. ;)

    But you'll find many recipes if you just Google with these keywords: homemade door alarm buzzer.
  3. neon


    Oct 21, 2006
    bad idea zapper some people are kill by heart attack go to for $20 buy a silent chime your location alarm simple yes?
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