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Infrared Sensor Help

Discussion in 'Sensors and Actuators' started by Sanglant, Oct 11, 2011.

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  1. Sanglant


    Oct 11, 2011
    I am trying to build a circuit that uses an infrared sensor to trigger a digital counting circuit. The problem that I am having is that when the path of the beam gets blocked, the circuit triggers too many times. I am guessing this is caused by some sort of bounce from the beam (I am using a reflector beam). I am trying to figure out what I can do to eliminate the bounce and have the circuit only clock one pulse instead of the 50 or so it clocks each time the beam is broken. I am using a 7490 bcd counter to drive a 7447 decoder.
  2. TBennettcc


    Dec 4, 2010
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I would seriously consider any solution that uses the term "monostable".

    edit: since you're using 74 series TTL, look at the datasheets for the 74121 / 74122 / 74123.
    Last edited: Oct 12, 2011
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