int trigger = 3;
int echo = 2;
int buzzer = 9;
int time ;
int distance;


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

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigger, LOW);
  digitalWrite(trigger, HIGH);
  digitalWrite(trigger, LOW);

  time = pulseIn(echo, HIGH);
  distance = time * 0.0172;

  if (distance > 30){

    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);

  }

  else{
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
    
    tone(buzzer, 1100, 300);
    delay(100);
    tone(buzzer, 700, 100);
    delay(200);
    tone(buzzer, 800, 1700);
    delay(200);
  }

}