Thanks for the response Ben. I like the idea of the piezo/acoustical
solution as well. A simple bandpass filter and a little hysteresis should do
it. Furthermore, the bandpass filter would be fairly transportable between
designs.
Shawn

>Of the top of my head, a reasonable third way would be to strap a simple
>microphone onto the chest over the heart. I wonder if a flat piezo disc
>would surfice.... I'd filter the output using a bandpass filter to remove
>extraneous noise (ie speech) and voila. Not sure if it's been done that way
>before but for simply testing the pulse rate a full ECG/pulse-ox solution
>appears overkill.
>
>Ben
>
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