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RS, EN pins of LCD connected to 13 and 12 of arduino and data pins D0-D7 are connected to arduino digital pin numbers 11, 10, 9, 8. A 16x2 LCD is used for displaying the status. Dout is directly connected to pin number 14 (A0) of arduino uno. Here a PIR sensor is used for sensing human motion which has three terminals Vcc, GND and Dout. These lenses are curved in such a manner so that sensor can cover a wide range.Ĭonnections for arduino based door opener circuit are shown in the above diagram. Pyroelectric sensor is covered by a plastic cap, which has array of many Fresnel Lens inside. As soon as somebody enters in first half, the infrared level of one half becomes greater than other, and this causes PIRs to react and makes the output pin high. Pyroelectric sensor divide in two halves, when there is no motion, both halves remain in same state, means both senses the same level of infrared. BISS0001 IC take the input from sensor and does processing to make the output pin HIGH or LOW accordingly. Along with BISS0001 ("Micro Power PIR Motion Detector IC"), some resistors, capacitors and other components used to build PIR sensor. The main component of PIR sensor is Pyroelectric sensor shown in figure (rectangular crystal behind the plastic cap). Whenever an object passes through the sensor range, it produces infrared because of the friction between air and object, and get caught by PIR. 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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