int echoPin = 2;
int trigPin = 3;
int ledH = 4;
int ledK = 5;
int ledB = 6;

void setup() {
  // put your setup code here, to run once:
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(ledH, OUTPUT);
  pinMode(ledK, OUTPUT);
  pinMode(ledB, OUTPUT);
}

float ultrasonik(){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int durasiPantulan = pulseIn(echoPin, HIGH);
  return durasiPantulan * 0.034 / 2;
}


void loop() {
  // put your main code here, to run repeatedly:
float jarak = ultrasonik();
  if(jarak>30){
    digitalWrite(ledH, HIGH);
    digitalWrite(ledK, LOW);
}

  else if(jarak<=30 && jarak>5){
    digitalWrite(ledK, HIGH);
    digitalWrite(ledH, LOW);
    digitalWrite(ledB, LOW);
}

  else if(jarak<=5){
    digitalWrite(ledB, HIGH);
    digitalWrite(ledK, LOW);
}
}