int echopin = 2;
int trigpin = 3;
int Time;
int Distance;
int buzzpin = 9;

void setup() {
  // put your setup code here, to run once:
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);
  pinMode(buzzpin, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigpin, LOW);
  digitalWrite(trigpin, HIGH);
  digitalWrite(trigpin, LOW);
  digitalWrite(echopin, HIGH);
  Time = pulseIn(echopin,HIGH);
  Distance = Time * 0.0172;

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

}