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Automatic light?

Discussion in 'LEDs and Optoelectronics' started by ScienceBorn, Nov 15, 2013.

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  1. ScienceBorn

    ScienceBorn

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    Sep 26, 2013
    Am trying to see if i could make a Automatic light that switch on automatically in the night and switch off during the day. Any idea?
     
    Last edited: Nov 15, 2013
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Use an LDR as sensor.
    Google "automatic night light"
     
  3. ScienceBorn

    ScienceBorn

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    Sep 26, 2013
    Thanks for the quick reply. If i have any question or any inconveniences when making the automatic light i will let you know.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    The main trick is to ensure that your sensor does not see the light because then it will turn itself off again and then it will be dark so it will turn back on... And so on.
     
  5. ScienceBorn

    ScienceBorn

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    Sep 26, 2013
    Ok. What if i replace my 330ohms resistor with a 06VDC relay? Will there be any change in the operation of the automatic light?
     
    Last edited: Nov 16, 2013
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    We could not possibly know.

    Mostly because we're not clairvoyants.
     
  7. ScienceBorn

    ScienceBorn

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    Sep 26, 2013
    Ok no problem. I will try it myself and see the outcome.
     
  8. Jibby

    Jibby

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    Sep 12, 2013
    Million such circuits using LDR ,Photo diode, photo transistor as sensors are on the net
     
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