LIGHT DEPENDENT RESISTOR connection

Discussion in 'General Electronics Chat' started by bhuvanesh, Jan 3, 2014.

  1. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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    if we connect ldr to one of analog input pin.does the change in resistance converted to digital value or the voltage which changes by potential divider circuit converted to digital value or niether.
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    "Analog" may mean the pin connects to an "analog to digital converter." These A2D converters act like simple voltmeters, so they will sense " the voltage which changes by potential divider circuit" and convert that to a digital value.

    If you correctly scale the divider you may get a useful conversion.
     
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  3. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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    1)i have connected 3v dc supply ldr ant led in series

    2)i have connected 3v dc supply with potential divider circuit by resistor and ldr and connected it to led

    the second works good.does first one works
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    u should be more specif.
    What you said does not make any sense wht's so ever.
     
  5. tracecom

    AAC Fanatic!

    Apr 16, 2010
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    If you would post a schematic, more people could understand your question, and you would get better answers.
     
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  6. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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    [​IMG]

    i have no simulation software so i did it in paint

    is that right way of connecting
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    show wht u drew !!
     
  8. t06afre

    AAC Fanatic!

    May 11, 2009
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    You also have a thread going on here http://forum.allaboutcircuits.com/showthread.php?t=93090 With almost the exact same question. I would not say it is site rule violation. But it is very confusing for other to help then you work this way. Then you create a thread in this forum. You are the owner of this thread. And you are free to take in any direction you want. So it would be perfectly OK. To start a thread asking on how to use a LDR, and then widen the topic some. And ask for help to connect this setup to micro in the same thread
     
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  9. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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  10. MrChips

    Moderator

    Oct 2, 2009
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    Keep discussion on the same topic in one thread.
    I have merged the two threads into one.
     
  11. mcgyvr

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    Oct 15, 2009
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