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HELP!! Laser or active infrared as motion sensor ???

Discussion in 'Electronic Basics' started by farha, Feb 18, 2006.

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  1. farha

    farha Guest

    I'm doing my project. here i hav 2 options. either to use the laser o
    the active infrared as my motion sensor. well i'm quite in DILEMMA t
    choose it. i'm considering the coat to construct the circuit and it
    path range in sensing the motion. any expert in motion sensor
    thanks p(^-^)
  2. Chris

    Chris Guest

    Hi, Farha. There are always more than the two horns of the DILEMMA,
    even if the third is just to do nothing.

    However, I'd suggest you Google "PIR motion detector", and go from
    there (and yes, the IR means infrared). These are usually used with
    intrusion detectors in commercial security setups. The sensors
    themselves aren't too expensive, either. You'll probably have a lower
    total project cost with one of these, too.

    Good luck
  3. Christopher

    Christopher Guest

    Hello Farha,

    My answers are from my low budget hobbyist perspective.

    Is this used in the day or night or both. Indoors or Out.

    Narrow field of view? What distance?

    Ultra-sonic motion detection can be a good approach.

    I agree with Chris (cfoely1064) that passive infrared methods are
    probably easiest setup.

    In your design do you want to use laser or active infrared for the
    detection of a beam break, which would require opposite sending and
    receiving side modules? This could give reasonable distance and
    stability using a laser pointer type diode? This could work day or
    night with certain alignment difficulties. Pulsing the beam can help
    against false triggering used with a missing pulse detector circuit.
    (555 type circuit)

    The longest range of motion detection I have experimented with is
    using Optical (phototransistor), which could detect the shift in
    background changes in daylight. Distances of over 100 yards are easily
    achievable. This was set up with a pinhole inside of a 12" tube, which
    narrows down the field of view at a good distance.

    Every method above has distinct advantages and major disadvantages.

    I experiment with Theremins, which are the ultimate motion sensors

    Good Luck, if you have not already finished your project.

    RS Theremin

    * * *

    Temecula CA.USA
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