#include <Servo.h>

#define trigPin 2 // Trigger pin of HC-SR04
#define echoPin 3 // Echo pin of HC-SR04

#define servoPin 9 // Signal pin of servo motor

Servo myServo;

void setup() {
  Serial.begin(9600);
  
  // Initialize servo
  myServo.attach(servoPin);
  
  // Initialize ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Trigger ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Measure the pulse from echo pin
  long duration = pulseIn(echoPin, HIGH);
  
  // Calculate distance in cm
  int distance = duration * 0.034 / 2;
  
  // Print distance for debugging
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  // Check if distance is within range
  if (distance < 250 && distance > 0) {
    // Move servo motor to 45 degrees
    myServo.write(45);
    delay(1500); // Adjust as needed for your servo
    myServo.write(0); // Return servo to initial position
  }
  
  delay(1000); // Delay between each measurement
}