A sensor is a detection device. The sensor can sense the measured information, and can transform the sensed information into electrical signals or output other required information forms according to certain rules. In this way, sensors meet the requirements of information transmission, processing, storage, display, recording and control.
The characteristics of the sensor include: miniaturization, digitization, intelligence, multi-function, systematization and networking. It is the first part to realize automatic detection and automatic control. The existence and development of sensors allow objects to have senses such as touch, taste, and smell, and make objects slowly become alive.