Final_sketch.cpp

#include<Servo.h>
#define echoPin 4
#define trigPin 5
#define buzzPin 2
Servo Myservo;
int pos;
int long duration;
int distance;
void setup() {
  Myservo.attach(3);
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(buzzPin, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration * 0.034 / 2);


  if (distance <= 25) {
    for (pos = 180; pos >= 0; pos--) {
     

      Myservo.write(pos);
      delay(111.1);
      Serial.println(pos);
       delay(20);
       if (pos == 0) {
        digitalWrite(buzzPin, HIGH);
        Serial.println("buzzer on");
        delay(2000);
        digitalWrite(buzzPin, LOW);
      }

    }

  }
  else {
    Myservo.write(180);
  }
  delay(200);

}