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need help with project

Discussion in 'General Electronics Discussion' started by surveillance101, Aug 27, 2011.

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  1. surveillance101

    surveillance101

    1
    0
    Aug 27, 2011
    hi need help with a special project to be use in surveillance.

    we are in need to build a prodject which will protect our back in a hostile country in south America.

    we need the likes of a "PIR" alarm that would guard a gate or laneway which can inform us via a transmit signal to us at a approx distance of 100 to 200 meters away from the gate or lane way.

    how can we build this in a simple matter what do we need PIR, transmitter and receiver how do we set this up can anyone help us thanks
    Herman
     
  2. Externet

    Externet

    759
    165
    Aug 24, 2009
    Shine a secure held laser pointer to a solidly mounted mirror at the gate/laneway and a photodiode sensor back at the base bounced point.

    No power supply that can fail/tampered requiered at the gate, Falling leaves/animals could trigger the beam but take them as functional system self-test .

    PIR does not have much range, and also suffers from false triggering from wind, leaves, animals.
     
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