#include <Servo.h>
Servo servoMain; // Define our Servo
int trigpin = 10;
int echopin = 11;
int distance;
float duration;
float cm;
const int buzzer = 4;

void setup()
{
   servoMain.attach(9); // servo on digital pin 10
    pinMode(trigpin, OUTPUT);
    pinMode(echopin, INPUT);

    pinMode(buzzer, OUTPUT);

}

void loop()
{ 
  digitalWrite(buzzer, LOW);
  digitalWrite(trigpin, LOW);
  delay(2);  
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);  
  digitalWrite(trigpin, LOW);  
  duration = pulseIn(echopin, HIGH);  
  cm = (duration/58.82);
  distance = cm;
  
  if(distance<60)
  {
    digitalWrite(buzzer, HIGH);
    servoMain.write(180);  // Turn Servo back to center position (90 degrees)
   delay(3000); 
  }
   else{
     servoMain.write(0);
     delay(50);
   }
   
}