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Using DB9 RI Pin to receive simple signal

Discussion in 'Electronic Basics' started by [email protected], Mar 21, 2006.

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  1. Guest

    I'm developing a simple DB9 Serial Port bicycle computer. The cadence
    and the speed was easy, as I had the diagram
    ( But I'm
    trying to add heartrate into it. I have a stereo cable that hooks up
    to a little polar receiver. If I hook it up like its cadence (it
    works). I.E. I put the wire to pin 6 and then have a 4k7 go from 6 to
    7, and then hook the ground to 4.

    But as 6 and 8 are used, I was thinking of trying to use pin 9 (ring
    indicator) for heartrate. If I hook up the wire to pin 9, add the
    ground to 4 and then a 4k7 to 7 as well it doesnt work.

    So basically, if I've used pins 6 and 8, how do I get another simple
    pulse? Java has a ring indicator event (so using that pin would make
    the software real easy). If I wire the HR to pin 9, the ground to pin
    4, and then a 4k7 between 9 and 7, that should work, shouldn't it? The
    HR wire, btw, is a stereo wire, could that be complicating it?

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