void setup() {
  #include <Servo.h>

// Define IR sensor pins
#define IR_SENSOR_1 2
#define IR_SENSOR_2 3
#define IR_SENSOR_3 4
#define IR_SENSOR_4 5

// Define LED pins
#define GREEN_LED 6
#define RED_LED 7

// Servo motor pin
Servo gateServo;
#define SERVO_PIN 8

// Total parking slots
const int totalSlots = 4;

// Parking slot status variables
int slot1, slot2, slot3, slot4;

void setup() {
  // Initialize IR sensor pins
  pinMode(IR_SENSOR_1, INPUT);
  pinMode(IR_SENSOR_2, INPUT);
  pinMode(IR_SENSOR_3, INPUT);
  pinMode(IR_SENSOR_4, INPUT);

  // Initialize LED pins
  pinMode(GREEN_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);

  // Attach the servo motor
  gateServo.attach(SERVO_PIN);
  gateServo.write(0); // Initial position: gate closed

  // Start the Serial Monitor (for debugging)
  Serial.begin(9600);
  Serial.println("Smart Parking System Initialized");
}

void loop() {
  // Read values from IR sensors
  slot1 = digitalRead(IR_SENSOR_1);
  slot2 = digitalRead(IR_SENSOR_2);
  slot3 = digitalRead(IR_SENSOR_3);
  slot4 = digitalRead(IR_SENSOR_4);

  // Calculate the number of available slots
  int occupiedSlots = slot1 + slot2 + slot3 + slot4;
  int availableSlots = totalSlots - occupiedSlots;

  // Update LED indicators
  if (availableSlots > 0) {
    digitalWrite(GREEN_LED, HIGH); // Green LED ON
    digitalWrite(RED_LED, LOW);   // Red LED OFF
  } else {
    digitalWrite(GREEN_LED, LOW);  // Green LED OFF
    digitalWrite(RED_LED, HIGH);  // Red LED ON
  }

  // Control the gate using the servo motor
  if (availableSlots > 0) {
    Serial.println("Slots Available. Gate Opening...");
    gateServo.write(90); // Open the gate
    delay(5000);         // Keep the gate open for 5 seconds
    Serial.println("Gate Closing...");
    gateServo.write(0);  // Close the gate
  } else {
    Serial.println("No Slots Available. Gate Closed.");
    gateServo.write(0); // Keep the gate closed
  }

  // Display status in Serial Monitor
  Serial.print("Occupied Slots: ");
  Serial.println(occupiedSlots);
  Serial.print("Available Slots: ");
  Serial.println(availableSlots);

  // Wait for 1 second before repeating the loop
  delay(1000);
}

  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}