A sensor (English name: transducer / sensor) is a detection device that can sense the information being measured, and can transform the sensed information into electrical signals or other required forms of information output in accordance with a certain rule to meet the information Transmission, processing, storage, display, recording and control requirements.

The characteristics of the sensor include: miniaturization, digitization, intelligence, multi-function, systemization, and network. It is the primary link to achieve 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 come to life. Generally divided into ten categories such as thermal sensors, light sensors, gas sensors, force sensors, magnetic sensors, humidity sensors, sound sensors, radiation sensors, color sensors, and taste sensors .