#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


#define in 3
#define out 2
#define relay 4
#define red 5
#define green 6

int count=0;

void IN()
{
    count++;
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0,1);
    lcd.print(count);
    delay(1000);
}
void OUT()
{
  count--;
    lcd.clear();
    lcd.print("Person In Room:");
    lcd.setCursor(0,1);
    lcd.print(count);
    delay(1000);
}

void setup()
{
  lcd.begin(16,2);
  lcd.backlight();
  lcd.print("Visitor Counter");
  delay(2000);
  pinMode(in, INPUT);
  pinMode(out, INPUT);
  pinMode(relay, OUTPUT);
  pinMode(red,OUTPUT);
  pinMode(green,INPUT);
  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);
    digitalWrite(green,HIGH);
    digitalWrite(red,LOW);
    lcd.clear();
    lcd.print("Nobody In Room");
    lcd.setCursor(0,1);
    lcd.print("Light Is Off");
    delay(200);
    
  }if(count>=10){
lcd.clear();
    digitalWrite(relay, LOW);
    digitalWrite(green,LOW);
    digitalWrite(red,HIGH);
    lcd.clear();
    lcd.print("reached the");
    lcd.setCursor(0,1);
    lcd.print("max count");
    delay(200);

  }
  
  else
   digitalWrite(relay, HIGH);
  digitalWrite(green,HIGH);
  digitalWrite(red,LOW);
}