//using flag for controlling PIR simulation
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int m=0;
int flag=0;
int flag2=0;
void setup() {
 pinMode(19, OUTPUT);//entry 
 pinMode(18, OUTPUT);//exit 
 Serial.begin(9600);
 
 lcd.init();
 lcd.backlight();

}

void loop() {
  lcd.setCursor(0,0);
  int x=digitalRead(19);
  int y=digitalRead(18);
  if(x==1 && flag==0)
  {
    m=m+1;
    lcd.clear();
    lcd.print(" ENTERED ");
    lcd.print(m);
    flag=1;
  }
  else if(x==0){
   flag=0;
  }
  if((y==1 && flag2==0) && m>0)
  {
    m=m-1;
    lcd.clear();
    lcd.print(" EXIT ");
    lcd.print(m);
    flag2=1;  

  }  else if(y==0){
    flag2=0;

  } 
}