LDR

Discussion in 'The Projects Forum' started by ammootty, Feb 21, 2014.

  1. ammootty

    Thread Starter New Member

    Feb 20, 2014
    7
    0
    hi....
    am wrkng on LDR.. i want to knw abt its output.. is it an analog output?? how can i connect it to an microcntrller??

    thnks in advnce....
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
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  3. ammootty

    Thread Starter New Member

    Feb 20, 2014
    7
    0
    hi Bertus...
    ok.. thank you..
     
  4. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    you mean a Light Dependant Resistor? like a cadmium sulphide photo cell? they drop their resistance when light hits them. maximum resistance in dark. you would have to use it in a voltage devider circuit, with a resistor to supply.
     
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  5. burger2227

    Member

    Feb 3, 2014
    190
    24
    Here's a little 2 battery LED circuit that turns on in evening or when room is dark:

    [​IMG]

    The batteries last for over a month with 2 LED's in my wall clock too. The 75 ohm resistor is optional for longer battery life.
     
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