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The Piezo Vibration Sensor is suitable for measurements of flexibility, vibration, impact and touch. The module is based on PZT film sensor LDT0-028. When the sensor moves back and forth, a certain voltage will be created by the voltage comparator inside of it.
Thus, it brings outputs of high & low levels. it has a high receptivity for strong impacts; however, a wide dynamic range (0.001Hz ~ 1000MHz) also guarantees an excellent measuring performance. Sensitivity can be by adjusted via the potentiometer with a screw.rn
Grove - Piezo Vibration Sensor Datasheet