Pulse/Heartbeat Sensor

Questions about Modern Device and JeeLabs Sensors
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sx3374
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Joined: Thu May 19, 2016 8:26 am

Pulse/Heartbeat Sensor

Post by sx3374 » Thu May 19, 2016 9:30 am

Why not display the value of 98% oxygen

paul
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Joined: Mon May 12, 2008 4:19 pm

Re: Pulse/Heartbeat Sensor

Post by paul » Fri Dec 02, 2016 6:49 pm

sx3374,

The PSO2 code still leaves lots to be desired.

It is supposed to a "ratio of ratios". Instead the code is just a ratio of IR over Red.
The PSO2 signal is not that exciting a signal because with reasonably healthy people it will be 98-100 percent and NEVER VARY.

It is possible to de-saturate down to somewhere around 90% (I've read). I have qualitatively confirmed this by holding my breath, but of course I never got a good quantitative measurement worked out.

We're really interested in your code if you get this going though ... :)

PB

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