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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

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.



  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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