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
    5
    0
    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.

    Thanks....
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    For circuits Google: beam break circuit

    Lots of options out there.

    Considerations:

    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.

    Ken
     
  3. AdamPrulhiere

    New Member

    Nov 12, 2009
    14
    0
    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
    5,450
    1,066
    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.
     
Loading...