The principle and composition of the sensor

A sensor is a detection device, a tool for obtaining information, or a machine for transmitting sensations. In the broadest definition, a sensor is a device, module, or subsystem, often used in automatic control and measurement systems. A sensor can be interpreted as a device or device that can transform a measured physical quantity (such as speed, temperature, sound, light, etc.) into another physical quantity (usually electricity) that is convenient for transmission and processing.
Another way to classify sensors is by the type of output they produce, according to whether they are analog or digital. Analog sensors convert environmental inputs into continuously varying output analog signals.
Unlike analog sensors, digital sensors convert environmental inputs into discrete digital signals transmitted in binary format (1s and 0s). Digital sensors have become quite common across all industries, replacing analog sensors in many cases. For example, digital sensors are now used to measure humidity, temperature, barometric pressure, air quality, and many other types of environmental phenomena.
The characteristics of sensors include: miniaturization, digitization, intelligence, multi-function, systemization, and networking. It is the first link 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 come alive slowly. Usually according to its basic sensing function, it can be divided into ten categories: thermal sensor, light sensor, gas sensor, force sensor, magnetic sensor, humidity sensor, sound sensor, radiation sensor, color sensor and taste sensor.