A piezoelectric sensor is a device that generates an electrical charge in response to mechanical stress. This means that when pressure, vibration, or movement is applied to the sensor, it produces a voltage that can be measured. These sensors are commonly used in various applications, including automotive systems, medical devices, and industrial equipment, to monitor changes in pressure or force. The working principle of a piezoelectric sensor is based on the piezoelectric effect, which occurs in certain materials, such as quartz or specific ceramics. When these materials are deformed, their internal electric dipoles shift, creating an electrical signal. This property makes piezoelectric sensors highly sensitive and suitable for detecting dynamic changes in their environment.