int pinTRIG = 3;
int pinECHO = 2;
int distance;
int time;
int pinBUZZ = 11;

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

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

if (distance > 40){
  digitalWrite(12, HIGH);
  digitalWrite(13, LOW);
}
else{
  digitalWrite(13, HIGH);
  digitalWrite(12, LOW);
  tone(pinBUZZ,200,100);
  delay(100);
  tone(pinBUZZ,400,1000);
  delay(200);
  tone(pinBUZZ,600,1900);
  delay(300);
}
}