PIR sensor help PLEASE

Discussion in 'The Projects Forum' started by paresh727, May 10, 2014.

  1. paresh727

    Thread Starter New Member

    May 10, 2014
    1
    0
    Hi Guys

    Its my first time ever posting on this forum. I really need some help and ive seen that the members on this site are very helpful.

    I am trying to build my own 12V PIR outdoor motion sensor. Its a simple device that is powered by a 220 to 12v (1A) power supply. I have a small PIR sensor (3 wires) and a siren. The trouble that i am having is that when ever i switch the system on, the pir is triggering a false alarm whilst is stabilizes and this results in the siren being on for approx 15-20 seconds.

    Is there anyway that i can prevent the siren from going of for the first 15-20 seconds *(i.e. whilst the pir is stabilizing ) ?

    I would really appreciate any help.

    PS. i have already tried installing a capacitor to try and stabilize the voltage during startup, but it doesnt seem to help:(
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,805
    1,105
    Welcome to the forum!
    Can you post a schematic?
     
  3. enggricha

    Member

    May 17, 2014
    62
    1
    what PIR module are you using...there are PIR modules that already account for these problems.

    you can also use a simple 555 timer to inhibit the siren for a start up time.
     
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