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Photoresistors, Phototransistors, Photodiodes which to use?

Discussion in 'General Electronics Discussion' started by supak111, Feb 2, 2013.

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  1. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

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    Apr 29, 2012
    Can't seem to understand which is best to use here.

    I need a super simple light switch for 24v DC. Will be used in a pitch black room, switch should be OFF with no light present, ON when there is light. Which of these can let, say 200 mA through it for 1 second when the light hits it?

    Photoresistor, Phototransistor, or Photodiode?

    I think i can use second 2 to drive a transistor and then the transistor can conduct enough mA but I'm hoping to keep it simple and not have to add resistors and transistors if possible of course.

    Thanks guys :)

    PS I was going to try just using a photoresistor in line with whatever I'm trying to switch ON / OFF?
     
    Last edited: Feb 2, 2013
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    2,652
    Nov 17, 2011
    Neither of these alone will suffice for the job. You will need additional circuitry. Google light sensor circuit and find a bunch of suitable circuits from very simple to rather sophisticated.
     
  3. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    334
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    Apr 29, 2012
    i was afraid of that but thank you for your answer bud
     
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