#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the HEX address
#include <Servo.h>

Servo myservo1;

int IR1 = 2;
int IR2 = 4;

int totalSlots = 4; // Enter Total number of parking Slots
int availableSlots = 4; // Initially all slots are available

int flag1 = 0;
int flag2 = 0;

void setup()
{
  lcd.begin(16, 2);
  lcd.backlight();
  pinMode(IR1, INPUT);
  pinMode(IR2, INPUT);

  myservo1.attach(3);
  myservo1.write(100);

  lcd.setCursor(0, 0);
  lcd.print("     ARDUINO    ");
  lcd.setCursor(0, 1);
  lcd.print(" PARKING SYSTEM ");
  delay(2000);
  lcd.clear();
}

void loop()
{
  if (digitalRead(IR1) == LOW && flag1 == 0)
  {
    if (availableSlots > 0)
    {
      flag1 = 1;
      if (flag2 == 0)
      {
        myservo1.write(0);
        availableSlots--;
      }
    }
    else
    {
      lcd.setCursor(0, 0);
      lcd.print("    SORRY :(    ");
      lcd.setCursor(0, 1);
      lcd.print("  Parking Full  ");
      delay(3000);
      lcd.clear();
    }
  }

  if (digitalRead(IR2) == LOW && flag2 == 0)
  {
    flag2 = 1;
    if (flag1 == 0)
    {
      myservo1.write(0);
      availableSlots++;
    }
  }

  if (flag1 == 1 && flag2 == 1)
  {
    delay(1000);
    myservo1.write(100);
    flag1 = 0;
    flag2 = 0;
  }

  lcd.setCursor(0, 0);
  lcd.print("    WELCOME!    ");
  lcd.setCursor(0, 1);
  lcd.print("Slot Left: ");
  lcd.print(availableSlots);
}