Sensors (English name: transducer/sensor) is a kind of detection device, sensing the measured information, and transform information into electrical signal according to certain rule or other forms of output information, for satisfying such requirements as information transmission, processing, storage, display, recording and controlling.
Sensor's features include: miniaturization, digitalization, intelligence, multi-function, and systemization and network. It is the first step of automatic detection and automatic control. The existence and development of the sensor, making objects have sensory of touching, tasting and smelling, and let objects live. Usually, according to its basic cognitive functions, sensors are divided into temperature sensor, light sensor, gas sensor, force sensor, magnetic sensor, moisture sensor, acoustic sensor, radiation sensitive element, color sensor and sensor etc..