Object detect sensor

Discussion in 'General Electronics Chat' started by mpcotuong, Mar 10, 2011.

  1. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0
    Hi All,

    I am looking for the circuit detect the object within 4 inches to make the output goes high. I have this project and don't not know where to start, so I think you are an expert and need your help.
    Please let me know your suggestion or any reference circuit is ok.


    Thanks, in advance for your help

    Kevin
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    286
    We need to know more about this sensor. What is "the object"? How is it to be distinguished from another object? Under what conditions is the detection to be done in?

    There is a great deal of difference between a light source, for example, and a small block of wood.
     
  3. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0
    The object such as paper or hand to cross over the sensor, so that make output goes high
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    286
    So the sensor is stationary, and detects a change in light intensity?
     
  5. mpcotuong

    Thread Starter Member

    Aug 26, 2010
    170
    0
    No, it look like hand and soap dispensing station
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    286
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