Many different types of sensors: pressure sensors, temperature sensors, weighing sensors, flow sensors, material (material) sensor, speed sensor, light sensors, infrared sensors, and so on. Such as automotive: temperature (water temperature) sensor, oil level sensor, speed sensor, tire pressure sensor; mall felt the smoke sensor; gravity sensor cell phone; street lights have light sensors; the automobile speeding (radar), red light (pressure-sensitive ); elevator overcrowding alarm (gravity sensors); industrial and mining enterprises in the water supply (gas) pipelines, there is pressure, flow, temperature sensors; incoming and outgoing material weighing, level sensors. Many types of sentence sensor, is widely used.