#include <Servo.h>

const int trigPin = 9;
const int echoPin = 10;
const int buzzerPin = 8;
Servo servoMotor;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  servoMotor.attach(7); // Attaching the servo motor to pin 7
  
  Serial.begin(9600);
}

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

  if (distance <= 50) { // Adjust this threshold according to your requirement
    Serial.print("Distance: ");
    Serial.println(distance);
    tone(buzzerPin, 1000); // Emit a warning tone
    servoMotor.write(0); // Move the servo motor to 90 degrees
    delay(1000); // Delay to stabilize servo movement
  } else {
    noTone(buzzerPin);
    Serial.print("Distance: ");
    Serial.println(distance);
    servoMotor.write(90); // Move the servo motor to 0 degrees
  }

  delay(100); // Delay to control the rate of measurements
}