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When it comes to sensors, people may think of small things. In the big concept of IoT, a ubiquitous IoT system, depending on the reference, a sensor can be a "big" "smart object", it can be a robot, a machine tool, a train, or even a satellite or a space probe. The IoT is concerned with the practical application of sensors, and the following are some of the IoT sensors: 1.Liquid level sensor: using the hydrostatic principle to measure the liquid level, an important application of pressure sensors, suitable for petrochemical, metallurgical, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries of various media liquid level measurement. 2.Speed sensor:It is a sensor that transforms the change of non-electricity (such as speed, pressure) into the change of electricity, and is adapted to speed monitoring. 3.Acceleration sensor:It is a kind of electronic equipment that can measure the acceleration force, can be used in control, handle vibration and shaking, instrumentation, automotive brake start detection, earthquake detection, alarm systems, toys, structures, environmental monitoring, engineering vibration measurement, geological exploration, railroads, bridges, dams vibration testing and analysis, as well as the mouse, the dynamic characteristics of high-rise building structures and safety and security vibration reconnaissance. 4.Gas sensor: It is a kind of sensor to detect specific gases, suitable for carbon dioxide gas, gas, gas, Freon (R11, R12), ethanol in breath, human oral odor detection, etc. Sensors are the support of IoT technology, application support and future ubiquitous network support, sensors sense the information of the object, RFID gives it electronic coding, sensor network to the evolution of the Internet of Things is the stage of information technology development characterization. https://renkeer.en.alibaba.com/?spm=a2700.29482153.0.0.cb5471d2hzGUGE