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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.


    Chip Shults
    My robotics, space and CGI web page -
  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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