Using DB9 RI Pin to receive simple signal
- From: "jb1566@xxxxxxxxxxx" <jb1566@xxxxxxxxxxx>
- Date: 21 Mar 2006 06:53:15 -0800
I'm developing a simple DB9 Serial Port bicycle computer. The cadence
and the speed was easy, as I had the diagram
(http://users.pandora.be/jim.de.sitter/html/spinner.html). 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?
Thanks
.
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