[Cyborg] Building a home polysomnograph to record heart rate, blood oxygen while you sleep.

Kevin Burton burtonator at gmail.com
Thu Jun 2 02:32:31 UTC 2011

On Wed, Jun 1, 2011 at 6:18 PM, Eric Boyd <mrericboyd at yahoo.com> wrote:

>  Hey, great idea, it'd be super awesome to have a USB-capable
> pulse-oximetry device.  I haven't heard of such a thing, at any price,
> though you're probably right that expensive ones exist.  I once hacked a
> cheap ($30) finger-clamp one in order to get out the heart-beat information,
> but basically all I did was wire into the LED display - it had a little
> display with 5 LEDs serving as a kind of bar-graph display for the signal
> from the heart, so all I did was wire into the 3rd and 4th LED, and feed
> that into the digital pins on my microcontroller.

This is what I was thinking as well... or OCR the display lol...

> Easy hack.  But I imagine it wouldn't be that much harder to find e.g. the
> control circuitry for the display and reverse it to get out the characters
> that are being shown (and thus the oxi-reading).  Feed that into a new Uno
> arduino and you could write the USB-interfacing stuff.  I'd love to help but
> sadly I'm in Toronto now.  Hopefully someone will step forward to help you
> out!
> Eric

There;s this guy:


which is the one I was talking about that has USB but I can't tell if it's a
sync protocol or real time.

I guess I could buy one for $150 and bring up a windows box and try to
reverse engineer the protocol which seems possible but annoying.
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