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use a PIR sensor as a light sensor switch

Discussion in 'Sensors and Actuators' started by beerzinnss, Sep 26, 2016.

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  1. beerzinnss

    beerzinnss

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    0
    Sep 26, 2016
    Hello,
    I have this light/motion sensor to turn on my flood light outside:
    http://www.steinel.de/en/Sensors/Motion-Detectors/IS-1-White.html ;
    My question is - would it be possible to use it as a switch for another lamp outside? So that when it's dark the lamps turn on, and turns off when ambient light level increases (not using the motion detection for the second circuit).
    I couldn't find a circuit diagram for this sensor and I'm also not sure it's ok to add a relay somewhere in a circuit like that.
    Maybe anyone has done something similar, or can help me in any way? If needed, I can open it up and take some pictures.

    Thanks!
     
  2. davenn

    davenn Moderator

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    1,875
    Sep 5, 2009
  3. beerzinnss

    beerzinnss

    8
    0
    Sep 26, 2016
    Thanks for the answer,
    This one has a dark/light sensor inside as well, so that the flood light turns on only when it's dark (and someone's walking by).
    You can see the two knobs for setting the brightness and time in the users manual (attached) from the manufacturers web site.
    My intention is to use the LDR inside the sensor (and its circuit), to turn on and off another pair of lamps (with a relay? transistor?).
    I thought that maybe someone here has opened up these sensors or tried something similar with them
     

    Attached Files:

  4. Bluejets

    Bluejets

    4,090
    857
    Oct 5, 2014
    The LDR is used as a conditional section of the pir complete circuit...ie if dark enough then....... Hacking into this is just not practical given the number and cost of basic LDRs which will do the job for about $15
     
  5. beerzinnss

    beerzinnss

    8
    0
    Sep 26, 2016
    Well, opened it up- couldn't resist :D
    turns out it is controlled by this chip:
    http://www.elmosna.com/uploads/tx_commerce/spec_e910_17.pdf
    Yes, a dark/light sensor costs around 5euros where i live, just wanted to try out modifing what I already have where I need it.
    Now I see it's nearly impossible, as the voltage through LDR goes in to the IC, rest is done digitally.
    Thanks anyway!
    Jānis
     
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