The DFRobot Vibration Sensor buffers a piezoelectric transducer that responds to strain changes by generating a measurable output voltage change which is propotional with the strength of vibration.So you can know the extent of vibration. Different from digital vibration sensor that only accounts times, this analog one can tell extent of vabiration. Specification: Supply Voltage: 3.3V to 5V Interface: Analog Size:22x30mm (0.87x1.2'') Documents: Wiki Doc Schimetics V2 Datasheet Product Includes: Piezo Disk Vibration Sensor x1 Analog cable x1 ImprovementList: Wide voltage range from 3.3V to 5V Standard assembling structure (Times-of-5mm Center distance between two 3mm mounting holes) Easily recognitive interfaces of sensors ("A" for analog and "D" for digital) Icons to simplely illustrate sensor function High quality connector Immersion gold surface Arduino can sense the pressure on piezoelectric unit.
