#include <Servo.h>
int pinTRIG = 7;
int pinECHO = A0;
int distance;
int time;
Servo myservo;

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

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

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