Piezo - heart beat sensor


I want to build a heart rate monitor using a piezo. I’ve read before that it should work with the piezo, but I can’t figure out how (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1138827944/8 ). Do I need to amplify the voltages that come from the piezo? Or do I just have a crapy piezo? The piezo is working though, but I have to squeeze/hit it really hard to get some information out of it.

thanks for your help

That link mentions a heart rate monitor using the LM3915 chip. That chip has an amplifier and it may have enough gain to work in your application. I did not see a mention of a heart rate monitor in the LM3915 datasheet I looked at but you may be able to find more on google.