heartbeat monitor

K

kmillar

Guest
I'd like to build a small, portable heartbeat logger - so I can log my
heartbeat as it changes during exercise, rest etc.

So my question is, whats a good way to detect a heartbeat? (You could
read that as how do some heartbeat detectors work?)

Pressure sensor in the wrist? Electical signal from the chest?

Any suggestions?
 
On 12 Aug 2005 04:43:01 -0700, the renowned "kmillar"
<kenny@kmillar.co.uk> wrote:

I'd like to build a small, portable heartbeat logger - so I can log my
heartbeat as it changes during exercise, rest etc.

So my question is, whats a good way to detect a heartbeat? (You could
read that as how do some heartbeat detectors work?)

Pressure sensor in the wrist? Electical signal from the chest?

Any suggestions?
Click to expand...

The Polar chest-transmitter type uses two 3" x 8" conductive fabric
pads (about 7" space between centers) on a band around your chest. The
PCB is about 1" square and powerd by a single inexpensive CR2025 Li
cell. The pads have to be moistened before use.

If you use this method, it should go without saying that low-voltage
battery power is the safe way to go.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
On Fri, 12 Aug 2005 08:09:05 -0400, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

On 12 Aug 2005 04:43:01 -0700, the renowned "kmillar"
kenny@kmillar.co.uk> wrote:

I'd like to build a small, portable heartbeat logger - so I can log my
heartbeat as it changes during exercise, rest etc.

So my question is, whats a good way to detect a heartbeat? (You could
read that as how do some heartbeat detectors work?)

Pressure sensor in the wrist? Electical signal from the chest?

Any suggestions?


The Polar chest-transmitter type uses two 3" x 8" conductive fabricf
^^^
Click to expand...
Argh. make that 0.8"


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Hi, they typicaly use a led/photocell arrangement, placed either side
of a finger or earlobe. If you use both visble and red leds you can
monitor your oxygen saturation as well.
 
kmillar wrote:
I'd like to build a small, portable heartbeat logger - so I can log my
heartbeat as it changes during exercise, rest etc.

So my question is, whats a good way to detect a heartbeat? (You could
read that as how do some heartbeat detectors work?)

Pressure sensor in the wrist? Electical signal from the chest?

Any suggestions?
Click to expand...
http://www.tinaja.com/glib/hack68.pdf


--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
cbarn24050@aol.com wrote:
Hi, they typicaly use a led/photocell arrangement, placed either side
of a finger or earlobe. If you use both visble and red leds you can
monitor your oxygen saturation as well.
Click to expand...
This method is utterly useless if there are motion artifacts.

See http://www.tinaja.com/glib/hack68.pdf


--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
On Fri, 12 Aug 2005 12:21:06 -0700, Don Lancaster <don@tinaja.com>
wrote:

cbarn24050@aol.com wrote:
Hi, they typicaly use a led/photocell arrangement, placed either side
of a finger or earlobe. If you use both visble and red leds you can
monitor your oxygen saturation as well.


This method is utterly useless if there are motion artifacts.
Click to expand...
Nonsense. See "Earpulse.pdf" on the S.E.D/Schematics page of my
website. It was used on both an exercise bicycle and a treadmill.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson wrote:
On Fri, 12 Aug 2005 12:21:06 -0700, Don Lancaster <don@tinaja.com
wrote:


cbarn24050@aol.com wrote:

Hi, they typicaly use a led/photocell arrangement, placed either side
of a finger or earlobe. If you use both visble and red leds you can
monitor your oxygen saturation as well.


This method is utterly useless if there are motion artifacts.



Nonsense. See "Earpulse.pdf" on the S.E.D/Schematics page of my
website. It was used on both an exercise bicycle and a treadmill.

...Jim Thompson
Click to expand...
Virtually all commercially successful exercise devices use chest straps.
Finger or earlobe devices are erratic nonperformers.


--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
On Fri, 12 Aug 2005 13:48:31 -0700, Don Lancaster <don@tinaja.com>
wrote:

Jim Thompson wrote:
On Fri, 12 Aug 2005 12:21:06 -0700, Don Lancaster <don@tinaja.com
wrote:


cbarn24050@aol.com wrote:

Hi, they typicaly use a led/photocell arrangement, placed either side
of a finger or earlobe. If you use both visble and red leds you can
monitor your oxygen saturation as well.


This method is utterly useless if there are motion artifacts.



Nonsense. See "Earpulse.pdf" on the S.E.D/Schematics page of my
website. It was used on both an exercise bicycle and a treadmill.

...Jim Thompson

Virtually all commercially successful exercise devices use chest straps.
Finger or earlobe devices are erratic nonperformers.
Click to expand...
Tell ITC in Tempe... they've been remarkably successful building
infrastructure for various OEM exercise machine manufacturers, using
my design that's now nearly 30 years old.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Thanks to everyone who replied.
I tried the led/photocell arranegment and it works well enough for me.
 
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