#include <Servo.h>

Servo myservo;
const int trigPin = 3;
const int echoPin = 2;

void setup() {
  // put your setup code here, to run once:
  myservo.attach(11);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

}
void loop() {
  // put your main code here, to run repeatedly:
  long duration, distance;

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

if (distance <=30){
  myservo.write(180);
}
  else {
    myservo.write(0);
  }
}