Help! Security Light & Switch with PIR Sensor

Discussion in 'General Electronics Chat' started by zyxel25, Mar 4, 2014.

  1. zyxel25

    Thread Starter New Member

    Aug 12, 2013
    2
    0
    Im currently working on this project http://www.electroschematics.com/6039/security-light-switch-with-pir-sensor/#comment-280360
    and using SB00622A-2 PIR Sensor instead of the PIR sensor given in the circuit because the PIR sensor available in our country is just SB00622A-2 and using LMR2-12D relay. Its not working to me and i dont know where to connect the load pins in the SB00622A-2 it is neccesary to connect it?. The led is not turning on and when i remove the no. 3 pin of the PIR on the ground the led is turning on. I dont know whats the problem . Im Using T1 and T2 is BC547B.
    D2 is 1n4002.


    thanks.
     
  2. roadey_carl

    Active Member

    Jun 5, 2009
    116
    5
    I think you could use a 12vdc supply without R1,D1 or C1.

    The output current on the SB00622A-2 is 100mA so I think you could use that relay straight to the output + and - ... not forgetting the diode.

    Then use a 500ohm current limiting resistor for the white LED assuming its 3.2v 20mA but still feed the spare contact with 12vdc.

    I may be wrong so hopefully somebody more experienced will check this :)
     
  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    I think roade carl is right & thumbnail is what I think he said.
     
  4. zyxel25

    Thread Starter New Member

    Aug 12, 2013
    2
    0
    i followed whats in the thumbnail and use a 12dc 1000ma source because thats the only 12v source i have,
    i saw a little white smoke on the pir and i suddenly disconnect the source, thank god the pir sensor is still working.
     
  5. roadey_carl

    Active Member

    Jun 5, 2009
    116
    5
    Check you had the polarity of the diode the right way on the output.
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Whoops & sorry; relay & LED got reversed when connected to PIR, another senior moment; crowding 90, and it's beginning to show.
     
  7. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
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    Belated correction. The on board connection of pin 1, +V input, to + out may have been vaporised, so + relay needs to connect to + 12V at input.
     
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