Detecting Walls With Infrared LEDs

Discussion in 'General Electronics Chat' started by Sudo Chocolate, May 14, 2015.

  1. Sudo Chocolate

    Thread Starter New Member

    May 14, 2015
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    I am wondering if anyone knows how to detect something with infrared LEDs. I think I should be able to simply put the LED on and then detect if it reflects with an infrared receiver but I want to make sure. Will it bounce off things besides metal and detect any object? What is the range like?

    Thanks!
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,148
    3,058
    The IR reflectivity of the surface will have a major impact on range and sensitivity. It's hard to say more without more detail.

    Modulating the IR LED at, say, 1-80kHz and then filtering the carrier out at the receiver will help a lot.
     
  3. Sudo Chocolate

    Thread Starter New Member

    May 14, 2015
    2
    0
    I am planning on putting it on a robot and just want to detect things from about a foot.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,148
    3,058
    You may need an ultrasonic rangefinder.
     
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