#include <Servo.h>

int echopin = A0;
int triggerpin = 7;
int time;
int distance;
Servo myservo;


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

}

void loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(triggerpin, LOW);
  digitalWrite(triggerpin, HIGH);
  time = pulseIn(echopin, HIGH);
  distance = time * 0.0172;

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

  else{
    myservo.write(0);
  }

}