DIY heart pulse sensor

[rocky79]

Anyone have any idea on where i can find a heart pulse sensor as a unit where i can interface it to microcontroller?

I have seen the piezo film acting as a sensor but i was wondering if there is a dedicated unit for that.

Thanks

[Dan Baldwin]

I used an infrared LED and a phototransistor taped to opposite sides of a finger. The pulse waveform isn't very big.

Dan

[Acetronics]

Hi, Rocky

I knew there was a serious one aboard my HDD ... ;)

Best regards

Alain

[rocky79]

Thanks Baldwin, do you have a photo or schematic of your device?

[rocky79]

Hi, Rocky

I knew there was a serious one aboard my HDD ... ;)

Best regards

Alain

Alain,

I am impressed, you always seem to have answers to my questions.I will study your schematic and i will let you know if i have more questions.

[Dan Baldwin]

Thanks Baldwin, do you have a photo or schematic of your device?

I'll bring it in tomorrow and sketch out a schematic. I used an op amp to get a larger signal, and I was planning on using the PICs A/D to record the actual perfusion graph for a period of time. I never got it hooked to the PIC, but I did make the input circuitry work well.


Dan

[rocky79]

I know a typical treadmill these days have a built in heart rate monitor. and as far as i remember you put your hand on the handle bar that has a metal strip. i didn't see any infrared sensor there.

Here is a link to one i found:
http://www.vernier.com/probes/hgh-bta.html

Does anyone have any idea on how it's done?

Thanks again

[ghoti]

I used an infrared LED and a phototransistor taped to opposite sides of a finger. The pulse waveform isn't very big.

Dan


The earlobe works better. Bill

[Dan Baldwin]

I know a typical treadmill these days have a built in heart rate monitor. and as far as i remember you put your hand on the handle bar that has a metal strip. i didn't see any infrared sensor there.

Here is a link to one i found:
http://www.vernier.com/probes/hgh-bta.html

Does anyone have any idea on how it's done?

Thanks again

I'm pretty sure that they use electrical signals like an EKG (ECG). I haven't done that.


The earlobe works better. Bill

I know that some pulse monitors use the earlobes, but I could never get mine to work that way. I tried. Maybe it just exerted to much pressure and cut off the blood flow.

Dan

[Acetronics]

Hi,

Here is the earclip adapter ... nice signal filtering !!!

http://web-ee.com/images/Earpulse.pdf

Alain