**Automatic Door Opener**

1.   Introduction

An Automatic Door Opener System is a simple project based on PIR Sensor and Arduino, which automatically opens and closes the door by detecting a person or object.

You might have seen Automatic Door Opener Systems at shopping malls, cinemas, hospitals etc. where, as soon as a person approaches the door (at about 2 or 3 feet), the door automatically slides open. And after some time (about 5 to 10 seconds), the door closes by sliding in the reverse direction.

Such Automatic Door Opener Systems are very useful as you do not need a person to standby the door and open it whenever a guest comes. Also, since the doors are opened and closed only when a person approaches the door, there is significantly less loss of air conditioning. So, in order to understand the potential of this concept, we have implemented a simple Automatic Door Opener System using Arduino and PIR Sensor.

2.   Components Required for Automatic Door Operner

All the Components related to your system should be listed here.

·      Arduino UNO (R3)

·      PIR Sensor

·      Logicstate

·      DC Motor

·      LM016L

·      L293D Motor Driver

3.   Components Description

·      Arduino UNO (R3)

In this project, Arduino UNO acts as the main controlling part. It reads the data from the PIR Sensor and activates the L298N Motor Driver based on the data from the PIR Sensor.

·      PIR Sensor

Detecting human motion is done with the help of PIR Sensor.

Advantages:

               1.    PIR Sensor can detect moving object even in dark with great accuracy.

               2.    PIR Sensor can detect motion without coming in contact with them.

·      L293D Motor Driver

Motor Driver is an important part of the project as it is responsible for driving the motor of the door. In this project, we have used the very common and very popular L293D Motor Driver Module.

4.   Working of Automatic Door Opener

The working of the Automatic Door Opener System using Arduino and PIR Sensor is very simple. This project can be considered as an extension of Arduino PIR Sensor and Arduino, L293D DC Motor Driver.

When the PIR Sensor detects any motion of a person, its Data OUT Pin will become HIGH which is connected with the Arduino. As this pin is connected to the Arduino, it will detect this HIGH Signal and understands that there is person approaching the door.

Arduino then immediately activates the L293D Motor Driver module to open the door. After some time (about 2 to 5 seconds in this project), the Arduino will once again activate the Motor Drive to close the door.

5.   Circuit 

Circuit OFF

Circuit ON

Circuit ON, Signal LOW

Circuit ON, Signal HIGH

6.   Code

#include<LiquidCrystal.h> 

LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

#define PIR_sensor 3 

#define in1Pin 5 

#define in2Pin 4

 

void setup(){

  //put your setup code here to run once:

  lcd.begin(16,2);

  pinMode(in1Pin, OUTPUT); 

  pinMode(in2Pin, OUTPUT); 

  pinMode(PIR_sensor, INPUT); 

  lcd.print("****AUTOMATIC");

  lcd.setCursor(0,1);

  lcd.print("DOOR OPENER****");

  delay(500);

  lcd.clear();

  lcd.print("Start------");

  delay(500);

}

 

void loop(){

  //put your main code here to run repeatedly:

  if(digitalRead(PIR_sensor)) 

  {

    lcd.clear();

    lcd.setCursor(0,0);

    lcd.print("MOVEMENT DETECT    ");

    lcd.setCursor(0,1);

    lcd.print("DOOR OPENED");

    digitalWrite(in1Pin, HIGH);  //The Door is Open

    digitalWrite(in2Pin, LOW);

    delay (700);

    digitalWrite (in1Pin,LOW);  //The door stops for some seconds

    digitalWrite (in2Pin,LOW);

    delay (700);

    digitalWrite (in1Pin,LOW);  //The door is closing

    digitalWrite (in2Pin,HIGH);

    delay (700);

    digitalWrite (in1Pin,LOW);  //The door is Close after some seconds

    digitalWrite (in2Pin,LOW);

    delay (700);

  }

  else

  {

  lcd.setCursor(0,0);

  lcd.print("NO MOVEMENT     ");

  lcd.setCursor(0,1);

  lcd.print("DOOR CLOSED");

  digitalWrite(in1Pin,LOW); //The door is Close

  digitalWrite (in2Pin, LOW);

  delay(700);

  }

}

                                                             ---- THANK YOU----