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PIR. motion sensor alarm circuit

A motion detection alarm circuit using a PIR.SENSOR motion detection, if the move is a positive light from the PIR sensor, triggered by a delay circuit, Q1 and relay it to work and hold for about 20 seconds. to apply to the siren to signal a warning to stop, or discarded by the switch S1 is a switch that controls it. Or a remote control.
PIR. motion sensor alarm circuit

Other circuits involved.

  1. PIR motion sensor
  2. Cheap burglar alarms
  3. How to install CCD camera sensor with VHF sender
  4. The PIR Movement detector with light-activated
  5. Ultrasonic motion detector project with versatile controls



Comments (12)

  • Niroj Kumar

    PIR Sensor required for inst/test/comm at west bengal.Kindly send your tech detailed with price offer for approx 100 nos.

    Niroj

  • aj

    hye i’m want to use this for my school project and i was wondering if you could explain to me further about the circuit. can i change the siren to maybe a lamp? and what id the use of the LED?

  • Keng

    Remove relay and put pilot lamp 9v to replace. For led series with resisitor 330 ohm 1/4w with one led

  • Jul Lie

    hi, this is for my project.. may i replace the siren into LED? are the schematic still the same?
    i need to the the operation of the circuit…

  • navid

    I want to use this ckt but not response properly.what is the code of motion pir sensor?

  • mack

    when i try this circuit…relay still not function..i try check the voltage across is 2++ volt..what happened.?

  • naik

    LED polarity is reversed

  • Raghav T raj

    how can we increase time delay

  • hassan

    i am using this circuit for my project. i have used a 12v o/e/n 57dp relay. the components are in good working condition. but when connected to circuit… its not working…

    please help me..

  • John Paul

    Relay is not working

  • hassan bassari

    Me too also commented on january 15 2015…. that the circuit is not working…
    but its working now after a few modification..

    I have made this circuit successfully for my 4th semester mini project..

    Please note the following to make it working..

    1. Do not use the capacitor C1… as it delays the relay to activate

    2. Use a 6v relay for better performance

    3. Also the led is connect wrong… reverse the connection of the led…

    4. It is better if we use a 12v 1A rectifier for input voltage

  • hassan bassari

    I have made this circuit successfully for my 4th semester mini project..

    Please note the following to make it working..

    1. Do not use the capacitor C1… as it delays the relay to activate

    2. Use a 6v relay for better performance

    3. Also the led is connect wrong… reverse the connection of the led…

    4. It is better if we use a 12v 1A rectifier for input voltage

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