Team Amrendra Sahni:

Published April 3, 2018 © Apache-2.0

Automatic Room Light Controller with Bidirectional Visitor

When at least one person enters the room, the light and fan turn ON. When everyone exits the room, the light turns OFF.

BeginnerShowcase (no instructions)30 minutes23,612

Automatic Room Light Controller with Bidirectional Visitor

Things used in this project

Hardware components

Arduino UNO

Relay (generic)

Resistor 100 ohm

Infrared Module

Adafruit Standard LCD - 16x2 White on Blue

General Purpose Transistor NPN

Breadboard (generic)

Software apps and online services

Arduino IDE

Story

The project of “Digital visitor counter” is based on the interfacing of some components such as sensors, motors etc. with Arduino microcontroller. This counter can count people in both directions. This circuit can be used to count the number of persons entering a hall/mall/home/office in the entrance gate and it can count the number of persons leaving the hall by decrementing the count at the same gate or an exit gate, and that depends upon sensor placement in the mall/hall. It can also be used at gates of parking areas and other public places.

This project is divided into four parts: sensors, controller, counter display and gate. The sensor would observe an interruption and provide an input to the controller which would run the counter increment or decrement depending on the entering or exiting of people. And counting is displayed on a 16x2 LCD through the controller.

Code

Source code

#include<LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);
#define in 14
#define out 19
#define relay 2
int count=0;
void IN()
{
    count++;
    if(count>=10)
    {
      count=10;
      }
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0,1);
    lcd.print(count);
    delay(1000);
}
void OUT()
{
    count--;
    if(count<=0)
    {
      count=0;
      }
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0,1);
    lcd.print(count);
    delay(1000);
}
void setup()
{
  lcd.begin(16,2);
  lcd.print("Visitor Counter");
  delay(2000);
  pinMode(in, INPUT);
  pinMode(out, INPUT);
  pinMode(relay, OUTPUT);
  lcd.clear();
  lcd.print("Person In Room:");
  lcd.setCursor(0,1);
  lcd.print(count);
}
void loop()
{  
  
  if(digitalRead(in))
  IN();
  if(digitalRead(out))
  OUT();
  
  if(count<=0)
  {
    lcd.clear();
    digitalWrite(relay, LOW);
    lcd.clear();
    lcd.print("Nobody In Room");
    lcd.setCursor(0,1);
    lcd.print("Light Is Off");
    delay(200);
  }
  
  else
    digitalWrite(relay, HIGH);
  
}

Automatic Room Light Controller with Bidirectional Visitor

Things used in this project

Hardware components

Software apps and online services

Story

Custom parts and enclosures

Circuit Digram

Code

Source code

Credits

Amrendra0110

Comments

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Automatic Room Light Controller with Bidirectional Visitor

Automatic Room Light Controller with Bidirectional Visitor

Things used in this project

Hardware components

Software apps and online services

Story

Custom parts and enclosures

Circuit Digram

Code

Source code

Credits

Amrendra0110

Comments

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