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Photocell circuit

Discussion in 'Electronic Design' started by john kitz, Jan 11, 2004.

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  1. john kitz

    john kitz Guest

    I have an Allen Bradley process controller I have wired as a burglar alarm
    on all the windows and doors throughout the house. My next step is to wire
    in motion detectors outside. I have several X-10 wireless motion detectors
    that work well detecting, but I need to find a circuit that will look at the
    flashing LED or tap into the LED circuit and give me a contact closure for
    the AB.
    Can anyone help.
  2. Fred Bloggs

    Fred Bloggs Guest

    It is best to use a *retriggerable* logic monostable in the LED circuit
    to drive a reed relay to the AB. See the 74HCT123, set the timeout for
    greater than the interpulse time to the LED- it can trigger off positive
    or negative going edges- and work from 2-6V.
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