int echo=2;
int trigg=3;
int time;
int distance;
int buzz=9;

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

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

  if (distance>30)
  {
    digitalWrite(11, HIGH);
    digitalWrite(13, LOW);
  }
  else{
    digitalWrite(11, LOW);
    digitalWrite(13, HIGH);
    tone(buzz, 1100, 300);
    delay(100);
    tone(buzz, 700, 100);
    delay(200);
    tone(buzz, 800, 1700);
    delay(200);
  }
}