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From: "Michael A. Terrell"
Subject: Re: searching for a pulse rate sensor
Date: Sat, 18 Jan 2003 23:49:34 -0500
Organization: Have you seen my bench? No, really! Where is it?
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References: <email@example.com> <3E2A221B.3BCB0DD7@webaccess.net>
Chuck Simmons wrote:
> Jim Thompson wrote:
> > On Sun, 19 Jan 2003 00:13:59 +0100,
> > "BarryNL" ,
> > In Newsgroup: sci.electronics.design,
> > Article: <firstname.lastname@example.org>,
> > Entitled: "Re: searching for a pulse rate sensor",
> > Wrote the following:
> > |
> > |"Barry Lennox" wrote in message
> > |news:email@example.com...
> > |> On 17 Jan 2003 18:18:39 -0800, firstname.lastname@example.org (Joe Blo) wrote:
> > |>
> > |> >I am designing a project where I need a pulse rate sensor.
> > |> >I could scavange one from an off the shelf pulse-rate meter, but I
> > |> >would rather get one with a data sheet that helps me to determine how
> > |> >I can interface it to a microcontroller to read the pulse rate of a
> > |> >human.
> > |>
> > |> I took a close took at the inside of one a while back, it had a
> > |> plastic housing that went over your finger, with an IR LED on one side
> > |> and a photodiode on the other. The theory is that the blood pulsing
> > |> through your finger modulates the amount of IR reaching the
> > |> photodiode.
> > |
> > |These sort are notoriously unreliable. [snip]
> > The one on my website is quite reliable... it was tested extensively
> > on just about every conceivable skin color ;-)
> You really need to work on the design to measure using a finger like
> many pulse oximeters do. The ear is now used for measuring temperature
> so it is sort of preempted.
Just use the other ear. That way you'll have a matched set.
Michael A. Terrell
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