#include <Servo.h>
int echoer = A0;
int trignometry = 7;
int Time;
int Distance;
Servo myservo;
void setup() {
  // put your setup code here, to run once:
  pinMode(trignometry, OUTPUT);
  pinMode(echoer, INPUT);
  myservo.attach(11);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trignometry, LOW);
  digitalWrite(trignometry, HIGH);
  Time = pulseIn(echoer, HIGH);
  Distance = Time * 0.0172;
  if(Distance>30){
    myservo.write(90);
  }
  else{
    myservo.write(0);
  }
}