Laser beam alarm system


Kip Kay has a new video and Instructable on building a laser-beam-triggered alarm system. I don’t know that I’d want to rely on such a thing for actual security, but it might be a fun project nonetheless.

Protect Your Home with Laserbeams! – Link

8 thoughts on “Laser beam alarm system

  1. frogsoceity says:


    Would be cooler with Altoids tins.

    I’d also like to see a battery pack and better mounting system for portability, so I could set these up in a hurry while on secret missions.

  2. xtremex says:

    mission impossible eh?
    tom cruise is in for some serious shit once he sees this

  3. ninj4boy00 says:

    your alarm design wont work!!!! it will stop ringing after the laser beam is “uncut”. how can i make it ring continueously until i turn it off????

  4. PaulieG says:

    What kind of schematic is that?
    Where do I get that awesome three terminal 9V battery?

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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. His free weekly-ish maker tips newsletter can be found at

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