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. Features 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 Connection Example – I/O Expansion Shield V7 Specifications Supply Voltage: 3.3V to 5V Interface: Analog Size: 22 x 30mm Resources Product Wiki Schimetics V2 Datasheet Package Contents 1x Piezo Disk Vibration Sensor 1x Analog cable