Get TZT 5V Piezoelectric Film Vibration Sensor Switch Module TTL Level Output For Arduino Piezoelectric Ceramics:   Piezoelectric ceramics are functional ceramic materials that convert mechanical energy and electrical energy. Piezoelectric effect. In addition to piezoelectricity, piezoelectric ceramics have dielectric properties, elasticity, and the like, and have been widely used in medical imaging. Acoustic sensors, acoustic sensors, ultrasonic motors, etc.  Piezoelectric ceramics are made by the relative stress of the internal positive and negative charge centers under mechanical stress, which results in opposite bound charges, ie piezoelectric effects, and sensitive properties at both ends of the material.