#include <Servo.h>

int echo=2;
int trigg=3;
int time;
int distance;
Servo myservo;

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

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigg, LOW);
  digitalWrite(trigg, HIGH);
  time = pulseIn(echo, HIGH);
  distance = 0.0172*time;

  if (distance>30)
  {
    myservo.write(90);
  }
  else
  {
    myservo.write(0);
  }
}