Simple 9V switch. Photodiode or Photoresistor?

Discussion in 'The Projects Forum' started by Dentsu, Jul 7, 2011.

  1. Dentsu

    Thread Starter Member

    Jul 7, 2011
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    hi, i am doing a simple small project powered by a 9v battery so which one would be better given my situation? the idea is when it see light it turns the system on (even night time) when it is in complete darkness it turns the system off (pocket for example). i know photodiode will be faster and transistor will be more sensitive. which one? i need my device to be already on when i take it out of my pocket.
     
  2. iONic

    AAC Fanatic!

    Nov 16, 2007
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    Given that the light in a pocket can vary quite a bit I might lead towards the sensitivity and tunability of the photo-transistor.
     
  3. dollat7852

    New Member

    Sep 22, 2010
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    Photodiode or ldr is better as transistor is nt a photosensitive switch
     
  4. iONic

    AAC Fanatic!

    Nov 16, 2007
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    Sure there are.

    Photo Transistor
     
  5. Dentsu

    Thread Starter Member

    Jul 7, 2011
    47
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    i am slowly making my way through the video tutorial and wondering if anyone have the time to make a schematic given the requirement? i want to order the parts now and by the time i am done all the videos i want to start soldering and not have to wait 2-3 weeks. simple one or a list will do. thanks.
     
  6. Dentsu

    Thread Starter Member

    Jul 7, 2011
    47
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    anyone know which one i can pick up? or will any phototransistor will work? will this one work? it is hard to read those technical detail..
     
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