Missing beam circuit For IR Led and Diode

Discussion in 'The Projects Forum' started by amila133, Oct 30, 2009.

  1. amila133

    Thread Starter New Member

    Oct 30, 2009
    Hi all,
    I want to design the missing beam detection circuit with IR Led and IR diode.
    tell me about some example circuit?
    When I am designing what are the factors that should I consider.

  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    For circuits Google: beam break circuit

    Lots of options out there.


    The distance between the LED and IR diode.
    Beam-width/angle of the LED, and detection angle of the diode.
    Ambient light/heat sources that can be detected by the diode circuit.

  3. AdamPrulhiere

    New Member

    Nov 12, 2009
    I made one of these in my circuits class. I was using an astable 555 timer to generate the IR pulse a monostable 555 to detect the missing pulse. I had some issues with the triggering of the monostable 555. If you take this approach I would look into the triggering of the monostable 555.
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    How much range? Do you want it to work outdoors in bright sun?

    I needed one that would work over a range of 3m, outdoors. I used a standard TV remote control IR receiver module (Sharp GP1U58Y) as the detector. I build a transmitter which modulated a IR Led at the carrier frequency (40kHz) to match the receiver. A momentary interruption of the beam causes the output of the IR receiver to switch low, and then high again.