The Piezo Vibration Sensor is based on piezoelectric transducer. It is well known that piezoelectric materials responds to strain (deflection) changes or applied force by generating a measurable output voltage. This output voltage is proportional to the strength of shock or vibration. So you can measure and characterize the vibration.
Pin definition:
S: output signal from the sensor (connected to Arduino analog input)
+: Voltage supply (VCC = 3.3 – 5)
-: ground (GND)
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