Impact sensor problem - Arduino UNO

Projects General Guidance
1

So I just got my sensors in the mail a couple of days ago. You can see them and their data sheet here: Piezo Vibration Sensor - Large - SEN-09196 - SparkFun Electronics

So anyways, I followed the set up used in the KnockSensor and even borrowed the code. You can view that here too (http://arduino.cc/en/Tutorial/Knock) Everything seemed like it should work fine for my case as a starting point but all I get is 0 on the serial. I try to test it by flicking the sensor, which should create a voltage, but it still remains unchanged. I dunno whats causing the issue. One thing I think might be the cause could be polarization. The sensors can give either a +90 V maximum voltage or a -90V. Its true sensitivity is only about 50mV/g so I don't expect it to reach anywhere near that level.
When I do get a signal it's a random sequence of numbers. Any advice?

2

post the code you are using and the results (serial characters) you see as the output

Also double check you connected everything up correctly