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Ir break beam help

Discussion in 'PCB Layout, Design and Manufacture' started by Matthew1986, Mar 26, 2018.

  1. Matthew1986


    Mar 26, 2018
    Hi all
    Just after abit of advice i am new to electronics never been near them before anyways i bought a ir break beam kit and soldered all the components to the board but for some reason when you break the beam nothing is happening can anyone shed any light as you can see from the pictures there is power getting to it any advise is appreciated
    Thank you


    Last edited by a moderator: Mar 27, 2018
  2. hexreader


    Apr 21, 2011
    Check the flat on the IR LED

    It looks reversed to me, but maybe it is a trick of the photo.

    EDIT: forgot to mention; a mobile phone camera will probably show whether the IR LED is lit. Try your camera with an IR TV remote to prove the concept, then try it on your IR LED
    Last edited: Mar 27, 2018
    davenn likes this.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Yeah, I'd say the IR LED is backwards too.
  4. hexreader


    Apr 21, 2011
    As a side note:

    Your batteries may run flat quite quickly. You might want to consider whether 9V DC adapter(s) - (or multi-voltage DC adapter) might save money in the long run.
  5. ChosunOne


    Jun 20, 2010
    You say that "nothing is happening" when you break the beam. What happens when you first energize the beam? Have you verified that the receiver relay switches state when when it receives a beam from the transmitter? If the relay doesn't energize in the first place, then "nothing will happen" when the beam is broken.

    The beam sets I'm used to usually energize a relay when the receiver unit receives a beam from the transmitter, but if yours is different, you should mention that.

    How are you breaking the beam? If you're putting a small object directly between the IR LED and photocell receiver, sometimes enough light will get around the barrier to keep the receiver activated. Also, sometimes there is enough ambient IR to keep the receiver triggered. The higher-end beam sets use a modulated beam that the receiver must see before it will activate.
  6. Matthew1986


    Mar 26, 2018
    Thanks all when i get home i will have a play around and put your answers in to practose and let you know the outcome..
    Thank you
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