A sensor detects traffic is approaching. Sensors for automatic doors are generally:
A pressure sensor - e.g., a floor mat which reacts to the pressure of someone standing on it.
An infrared curtain or beam which shines invisible light onto sensors; if someone or something blocks the beam the door is triggered open.
A motion sensor which uses low-power microwave radar for the same effect.
A remote sensor (e.g. Based on infrared or radio waves) can be triggered by a portable remote control, or is installed inside a vehicle. These are popular for garage doors.
A switch is operated manually, perhaps after security checks. This can be a push button switch or a swipe card.
The act of pushing or pulling the door triggers the open and close cycle. These are also known as power-assisted doors.
Many types of automatic doors have a signal input that control system in door is necessary. By electricity automatic doorsare powerd open and closed .
there! This sounds like a funny questions, but I suppose that I can still try
to answer it! It works with a sensor. The latter detects motion as you get
close and that’s when it opens. It will close as soon as the sensor stops
detecting movements and so on. It’s pretty simple really!