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'[OT]: Heart rate monitor???'
2000\11\22@093519 by John Perkinton

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Has anyone out there ever seen a heart rate monitor circuit. I am about to
built a circuit that will read someones heart rate using something into a
16f84 pic chip, then transfer it via rs232 to a pc. Does anyone have a clue
as to how to monitor a heart rate?

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2000\11\22@094337 by D Lloyd

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Hi,

You can buy bands that go around your chest that actually transmit pulses,
via RF, to a receiver (this is the kind of things used for professional
cycle computers). They are about $80 but I cannot remember the
source.....maybe it was King Cycle?. You can also buy "clip on" units but I
am not sure about their output.

As opposed to that, you could always do some signal processing on an
electrode output or use an infra red sensor to detect "pulses" of blood
moving under the skin (usually on fingers, wrist or ear lobes).

Depends if you want to measure it yourself or use a commerical product with
a transducer giving a sensible output.

Dan





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Subject:  [OT]: Heart rate monitor???

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Has anyone out there ever seen a heart rate monitor circuit. I am about to
built a circuit that will read someones heart rate using something into a
16f84 pic chip, then transfer it via rs232 to a pc. Does anyone have a clue
as to how to monitor a heart rate?

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2000\11\22@120036 by Dan Michaels

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Dan Lloyd wrote:
>
>You can buy bands that go around your chest that actually transmit pulses,
>via RF, to a receiver (this is the kind of things used for professional
>cycle computers). They are about $80 but I cannot remember the
>source.....maybe it was King Cycle?. You can also buy "clip on" units but I
>am not sure about their output.
>

Polar is the big producer - and has the main patents. You can pick
up the belt signals with an LC ckt+amplifier tuned to between 1 & 5
Khz - forget exactly.
===========

>As opposed to that, you could always do some signal processing on an
>electrode output or use an infra red sensor to detect "pulses" of blood
>moving under the skin (usually on fingers, wrist or ear lobes).
>

IR devices are not as good as the Polar belt/watch units for activity
situations.

You can tape electrodes to the chest, like they do with EKGs, and
feed them to a fairly simple differential amp [basic signals are
couple of mV], but now you have to worry about safety/electrocution
concerns, and severe regulatory issues with the FDA.

You can probably find ckts/etc by doing a search at google.com.

regards,
- Dan Michaels
Oricom Technologies
http://www.oricomtech.com
=========================

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2000\11\30@180155 by Johan Berglund

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On Wed, 22 Nov 2000, John Perkinton wrote:

> Has anyone out there ever seen a heart rate monitor circuit. I am about to
> built a circuit that will read someones heart rate using something into a
> 16f84 pic chip, then transfer it via rs232 to a pc. Does anyone have a clue
> as to how to monitor a heart rate?

If you wan´t "real" heart rate monitoring you will have to measure the
hearts electrical signals the same way as ECG equipment do. Some of the
heart rate monitors on the market works this way.

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