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Daylight-turn off

Discussion in 'LEDs and Optoelectronics' started by Mike_shams71, Aug 1, 2015.

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  1. Mike_shams71

    Mike_shams71

    2
    0
    Aug 1, 2015
    Hi everyone!
    I want outdoor LED lights that work off a 5V DC power bank, but they need to automatically turn off when it's daylight. How can I do that?
    Thanks for your ideas
     
  2. Old Steve

    Old Steve

    734
    169
    Jul 23, 2015
    I'd use an LDR connected to a comparator, with the comparator output switching the LEDs on/off.
    (LDR = light-dependent resistor)
     
  3. Ajay110

    Ajay110

    1
    0
    Sep 4, 2015
  4. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    I just created this basic circuit, the resistor value that changes is a light diode resistor (ldr) low resistance means high light level, high resistance would mean little light..

    The two screenshots show the different states basically swap it for the ldr, if you need more power a darlington pair or maybe swap out for a mosfet
     

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