PIR sensors can detect small amount of variation in infrared. Human also emits infrared because of body heat. Here we should note that every object emits some amount of infrared when heated. They are also referred as Pyroelectric or IR motion sensors. PIR sensor detects any change in heat, and whenever it detects any change, its output PIN becomes HIGH.
The signal is further sent to arduino uno that controls the door. When someone comes in front of the door, the infrared energy detected by the sensor changes and it triggers the sensor to open the door whenever someone approaches the door. It uses a motion-detecting sensor (PIR sensor) to open or close the door which detects the infrared energy omitted from human's body. A number of technologies are available to make such kinds of systems like PIR sensors, Radar sensors, Laser sensors, Infrared sensors, etc. In this arduino based project, we have tried to replicate the same system by using a PIR sensor.
They open the door when someone comes near the entrance and close it after sometime. You must have seen automatic door openers in shopping malls and other commercial buildings.
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