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Discussion in 'Electronic Basics' started by [email protected], Feb 16, 2007.

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  1. Guest

    I'd like to set up a walk-in sensor. Something like the things you see
    in all those 007 movies. When someone walks through the door,
    interrupts a laser-light at foot level.

    The thing is, I don't want to spend a lot of money on it.
    I was wondering if it's possible to do it with some Japanese-made-key-
    As I'm new at this, I don't know the name of the "light-sensor"

    Well, If someone could give me a hand, I'd really appreciate.
    It doesn't have to bee a big hand. Component's names would be great =)

    Thx, Jc
  2. I think this link shows the general thing you are talking
    about, and you can peel enough key words from it to look
  3. Lord Garth

    Lord Garth Guest

    Use google and look for "laser trip wire"....
    cheap! They use IR diodes rather than a laser however.

    or build your own
  4. Radio Shack sells these - eBay too. Look for Door Minder.
  5. Marc Britten

    Marc Britten Guest

    Just to throw a monkey wrench at you, I think it would be cooler to
    have a capacitive proximity sensor. Invisible.
  6. Of course, in some movies the lasers aren't just covering the doors,
    they create a full pattern in the room, so movement is nearly impossible,
    especially if the lasers are infrared so they can't be seen normally.

  7. And in some movies the 'lasers' are just an excuse for Catherine Zeta-Jones
    to wriggle around in skin tight clothes!


  8. I'm fine with it too. Halle Berry has made a lot of bad movies wearing very
    little - I wish we could have just the good parts of those!
  9. Bob Myers

    Bob Myers Guest

    Not that that's a BAD thing, mind you....

    Bob M.
  10. Guest

    An ORP12 light dependant resistor in a potential divider circuit and a
    dc amp of some kind with perhaps a relay output stage to switch
    whatever you need to switch would do the trick.
    My website has a system for working out all kinds of simple circuits,
    which is intended for beginners, and your cicuit can easily be
    assembled from these kits.

  11. jasen

    jasen Guest

    photocell, phototransistor, light dependant resistor,
    try google-ing these phrases

    light beam sensor schematic

    photointerruptor schematic

    phototransistor datasheet

    investigate the first 10 hits on each.

  12. Rich Grise

    Rich Grise Guest

    A laser beam is invisible from the side, unless there's dust or smoke
    in the air. If your burglar is a smoker, he might see it and run away. ;-)

    (or step over it - better use several of them.) ;-)

  13. JeffM

    JeffM Guest

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