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Forgive me i f this is irrelavent, finger pulse detectors are usually infra red, such a circuit would be easier to build.
sam288,
You'll need a very sensitive accelerometer to detect this (obviously) but even then a piezoelectric accelerometer may not be the best option. Our heart rate should be roughly 60 beats a minute or on the order of 1 Hz which is at the lower end of piezoelectric accelerometer's bandwidth. You may be better off with a capacitive MEMS accelerometer or piezoresistive.
Here's a link on some basics of accelerometer selection and the difference between the three main accelerometer types (piezoelectric, piezoresistive, and capacitive MEMS): https://blog.mide.com/accelerometer-selection
The original post was in 2009. Maybe MEMS accelerometers were not so easy to find back then? I could not say as I don't remember
I am guilty of doing the sameI hate it when that happens. I forget to look at dates.
Thanks Mike
Ron