Buliding a fingertip pulse device

See "Earpulse.pdf" on the S.E.D/Schematics page of my website. This uses light, but works on fingers just as well as it does on ear lobes.

...Jim Thompson

You've got it right, Jim. I recently had a work up (I have both AF and COPD). The tech had me walk briskly up and down the hall for a total of a few hundred meters while keeping an eye on a hand held pulse meter. The pickup was an IR (or red?) LED and photo pickup. I can't see a pressure transducer working reliably in that application.

Ted

I read in sci.electronics.design that Pauly_G2002 wrote (in ) about 'Buliding a fingertip pulse device', on Fri, 11 Nov 2005:

Use a ceramic sounder disc. They make excellent low-frequency pressure transducers and are very low-cost.

Hey, John -

What is a sounder disc?

Thanks, John

This has been done using a laser that can also read out blood pressure...

Thanks for all the help guy, massive help

Thank you all

Paul

Pressure sensing is going to be VERY sensitive to mechanical influences. Don't the commercial ones use optical techniques? mike

Hi Robert,

Cool, do you have any sources?

Marte

Something else of interest: you can measure the oxygen level in the blood by using 2 leds instead of one: 1 red, one IR. The difference between the two (once calibrated) is related to how many red blood cells are carrying oxygen. The hospital ones do this.

-Daniel

anyone have a basic shematic for this to use with an i/o device? im buying an ethernet 24port i/o device soon, and monitoring my pulse and blood oxygen levels would be very nice, also as i suffer sleep apnea i could see how often my oxygen levels drop

ive come across this

You mean like this one?

You could also try

Good Luck! RIch

ahh yeah, thanks, i foudn on wiki the wavelengths needed,

Hi,

real things are more difficult than principle schemas looks like ;-) But it is true you need only one Photodiode. But for layman it would be easier to built the device from Circuit Cellular Dec 2004 Issue 173 Page 26 "TSL230R-Based Pulse Oximeter"

Marte

On Wed, 16 Nov 2005 13:55:50 +0100, Marte Schwarz wrote: [someone wrote]

This one?

Did that guy get paid by the word? ;-)

Thanks! Rich