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photocell project

Discussion in 'LEDs and Optoelectronics' started by jacobi, Jan 18, 2018.

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  1. jacobi


    Jan 18, 2018
    I hooked up a led and photocell in series with 5 volts and instead of the
    led getting brighter when covered to make dark it gets dull.
    Can some photocells be made to do that? I just found some laying around to try.
    Could use some advice on this.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    What kind of photocell didi you use?
    If you used the LDR type (photoresistor) this is to be expected as the resistance increases without light shining onto the LDR.
  3. jacobi


    Jan 18, 2018
    Thanks I am sure that is what it is. These aren't marked or nothing,I just thought I'd try them.
    So there are a few different kinds of photocells.I just wanted to confirm that. Thanks again
    I feel better already.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Well there are different types of sensors, but you'll struggle to find one that reduces it's resistance in the dark.

    Typically the LDR you have would be coupled to a simple circuit to turn in a load when it's dark.

    The classical circuit could probably be found by googling for "dark sensor circuit"
  5. jacobi


    Jan 18, 2018
    Thanks steve, I got all that understood now. You all taught me a lot,Good information here.
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