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

// Pin definitions
const int trigPin = 9;
const int echoPin = 10;
const int servoPin = 6;

// Create the servo object
Servo gateServo;

// Create the LCD object
LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD 16x2 size, adjust I2C address if necessary

long duration;
int distance;
int openAngle = 90;   // Servo angle to open the gate
int closedAngle = 0;  // Servo angle to close the gate

void setup() {
  // Start serial monitor for debugging
  Serial.begin(9600);

  // Initialize the servo motor
  gateServo.attach(servoPin);
  gateServo.write(closedAngle);  // Initially close the gate

  // Initialize LCD
  lcd.begin(16, 2);
  lcd.setCursor(3, 0);  // Set the cursor to column 4, row 0 for centering "COOL MALL"
  lcd.print("COOL MALL!");
  delay(2000); // Display message for 2 seconds

  // Initialize ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Measure the distance using the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.0344 / 2;  // Distance in cm

  // If the distance is less than a certain threshold (car detected), open the gate
  if (distance < 15) {
    
    lcd.setCursor(1, 1);  // Set the cursor to row 1, column 2 for centering the message
    lcd.print("Please Come In");
    //delay(500);  // Display the message for half a second

    // Re-display "COOL MALL" after the car enters
    
    lcd.setCursor(3, 0);  // Set the cursor to column 4, row 0 for centering "COOL MALL"
    lcd.print("COOL MALL!");

    gateServo.write(closedAngle);  // Close the gate after car enters
  } else {
    lcd.clear();
    lcd.setCursor(4, 1);  // Set the cursor to row 1, column 4 for centering "Welcome!"
    lcd.print("Welcome!");
    //delay(1000);  // Display "Welcome!" for 1 second

    // Re-display "COOL MALL"
    
    lcd.setCursor(3, 0);  // Set the cursor to column 4, row 0 for centering "COOL MALL"
    lcd.print("COOL MALL!");

    gateServo.write(openAngle);  // Open the gate
  }

  delay(500);  // Delay before next measurement
}