A sensor is a device that converts non-electrical quantities (such as temperature, humidity, light, magnetic field, sound, etc.) into electrical signals.Many types of sensors, mainly divided into physical sensors and chemical sensors. The physical sensor can change the physical changes (such as pressure, temperature, speed, temperature and magnetic field) into a changing electrical signal. The chemical sensor will be measured changes in small changes into the change Electric signals, such as gas sensors, are a common chemical sensor. If the person's eyes, ears and skin as a physical sensor, then the tongue, the nose is the chemical sensor. This chapter introduces some of the more common sensors: gas sensors, pyroelectric infrared sensors, Hall sensors and thermocouples.

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