npn reflective photo sensor input

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  1. - 17th September 2007, 22:29 #1
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    Armadus
    Armadus is offline Junior Member
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    Default npn reflective photo sensor input

    I want to use a 25V reflective photo sensor as a digital input for a PIC 16F628.

    Attached is a sketch of the circuit I am working with.

    For information on the sensor see:
    http://www.factorymation.com/s.nl/it...category=14137

    This circuit works while the PIC input is high, but is unreliable when pulled low.

    Any suggestions on how to use an NPN photo sensor as an input.
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