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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


    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
  2. Externet


    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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