#include <Servo.h>

Servo servo;  // Create a servo object

const int trigPin = 7;  // Ultrasonic sensor trigger pin
const int echoPin = 6;  // Ultrasonic sensor echo pin
const int servoPin = 9; // Servo control pin

void setup() {
  servo.attach(servoPin);  // Attach the servo to the servoPin
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);  // Initialize serial communication for debugging
}

void loop() {
  long duration, distance;
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate distance in cm
  distance = (duration / 2) / 29.1;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < 50) { // Adjust this distance as per your needs
    servo.write(90); // Open the door (90 degrees)
  } else {
    servo.write(0); // Close the door (0 degrees)
  }
}