Piezo as a digital input


i've been looking for a while for a way (or a schematic) to get a piezo to act like a momentary push button.

I'm sure it's not that complicated, but i can't figure out the schematic and the components needed to detect a shock on the piezo and transform the shock into a simple trigger pulse readable by a digital input of the arduino.

Maybe one here would help me ?


look for the magic words "knock sensor", and all will be revealed ;-) search either here or in google. it is a well known circuit.