#include <LiquidCrystal_I2C.h>
#include <Servo.h>

#define servoPin    9
#define inSensor    A0
#define outSensor   A1

int counterCar;

LiquidCrystal_I2C lcd(0x27, 16, 2);   // LCD 
Servo gateServo;

void setup() {
  lcd.init();             // initialize the LCD
  lcd.backlight();        // Turn on the 

  pinMode(inSensor, INPUT);
  pinMode(outSensor, INPUT);

  gateServo.attach(servoPin);
  gateServo.write(90);
  lcd.home();
  lcd.print("Parking System");

  counterCar = 0;
  lcd.setCursor(0,1);
  lcd.print("No of Car = ");
  lcd.print(counterCar);
}

void loop() {
  if(digitalRead(inSensor) == LOW){
    while(digitalRead(inSensor) == LOW){
      gateServo.write(170);
      delay(100);
    }
    counterCar++;
    lcd.setCursor(12,1);
    lcd.print(counterCar);
    gateServo.write(90);
    delay(500);
  }

  if(digitalRead(outSensor) == LOW){
    while(digitalRead(outSensor) == LOW){
      gateServo.write(170);
      delay(100);
    }
    counterCar--;
    if(counterCar < 0) counterCar = 0;
    lcd.setCursor(12,1);
    lcd.print(counterCar);
    gateServo.write(90);
    delay(500);
  }
}