heartbeat monitor

[kmillar]

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?

 

[Spehro Pefhany]

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 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

 

[Spehro Pefhany]

The Polar chest-transmitter type uses two 3" x 8" conductive fabricf

^^^
Argh. make that 0.8"


Best regards,
Spehro Pefhany

 

[[email protected]]

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.

 

[Don Lancaster]

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?

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: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Don Lancaster]

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.

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: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Jim Thompson]

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

 

[Don Lancaster]

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.


--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Jim Thompson]

Virtually all commercially successful exercise devices use chest straps.
Finger or earlobe devices are erratic nonperformers.

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

 

[kmillar]

Thanks to everyone who replied.
I tried the led/photocell arranegment and it works well enough for me.