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motion detector as switch

Discussion in 'Electronic Basics' started by Joe, Dec 12, 2003.

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  1. Joe

    Joe Guest

    I'm building a project where I need a battery operated motion detector to
    turn on a battery powered motor whenever motion is detected. I'm using a
    9-volt battery - and have very little experience in building such a circuit.
    Could anyone recommend a parts place or walk me through what I need to make
    this work? Thanks!
     
  2. This depends on what sort of motion you want to detect and how you want to
    detect it. I often purchase small passive IR sensors from surplus stores, and
    once found the circuit boards (working ones, not scrap) at 3 for a dollar.
    Give us a few more details if you can.

    Cheers!

    Chip Shults
    My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
     
  3. The motion sensor circuit will probably use as much current as a 9V
    battery can supply.

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  4. Joe

    Joe Guest

    It just needs to detect the presence of a human from about 2-3 feet away -
    I'm not familiar with how IR sensors work - but once a human is detected,
    the object is activated, perhaps triggering a capacitor to discharge.
     
  5. Some of the PIR detectors run on their own lithium battery, and last
    for seven to ten years before the battery dies.

    --
    14 days!


    Michael A. Terrell
    Central Florida
     
  6. James Sweet

    James Sweet Guest

    Last I checked you could get surplus motion detectors from Electronics
    Goldmine, all you'd need to do is add an LED.

    Trigger a capacitor discharge? What do you need that for? If you're trying
    to build a boobytrap just remember that if someone breaks in and gets hurt,
    *you* are the one likely to end up in jail, however silly it may be.
     
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