Common sensors in life

　　In life, we closely meet sensors, such as when you walk to a door, the door automatically opens. How does it know someone is passing? This is called a sensor. If you look closely, the radar sensor is not the same as the infrared sensor, and the force sensor is not the same. It's the physical quantities that the sensors perceive differently.

　　Radar sensor As long as something reflects the microwave signal to the radar sensor, the radar sensor controls the circuit and opens the automatic door. If you can't get the micro signal, close the automatic door. The circuit can set the delayed closing time.

　　Infrared sensors can feel the infrared signal sent by the object, people standing at the door, the infrared signal is strong, the door will automatically open, other objects, such as tables, stools, these infrared signals are weak, placed in the door, the door will not open itself. People have been standing at the door, the door has not been closed, among which the infrared switch signal can also be set.

　　When a person stands at the door, the sensor feels a certain force value, controls the circuit, the door opens, and the door closes itself after the person leaves. The number of forces reached the door to open, the number of seconds after the person left to close, this can be set.

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