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Garage sensor

Discussion in 'Electronic Basics' started by trickyrick, Nov 1, 2007.

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  1. trickyrick

    trickyrick Guest

    Good day
    I have the sensors from a garage door opener ( the two sensors that
    raise or stop the garage door if someone walks under it). I want to
    use (if I can) them in a circuit to activate a relay. I'm having
    trouble figuring out how to wire them as they were both wired parallel
    into the back of the garage door opener (motor). Any suggestions
  2. Tom Biasi

    Tom Biasi Guest

    Hi Rick,

    The sensors may not do anything by themselves, the main circuitry could be
    in the motor unit.
    Some units modulate the beam and the circuitry for that is in the motor

  3. trickyrick

    trickyrick Guest

    Is one of the units made up of some kind of photo cell Then something
    should be able to be made up to operate a relay
  4. Joerg

    Joerg Guest

    It's a photodiode, usually. So just use Google, should be plenty of
    circuit there to amplify a photodiode signal and make it switch a relay.
    Hint: Don't forget the hysteresis (slight positive feedback to avoid
    flickering of the relay when at the light threshold).
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