#define ECHO_PIN 2
#define TRIG_PIN 15
#define Merah 5
#define Kuning 18
#define Hijau 19
#define Biru 21
#define Buzzer 12
void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(Merah, OUTPUT);
  pinMode(Kuning, OUTPUT);
  pinMode(Hijau, OUTPUT);
  pinMode(Biru, OUTPUT);
  pinMode(Buzzer, OUTPUT);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

  Serial.print("Jarak: ");
  Serial.println(distance);

  delay(100);
  if (distance > 50 && distance < 100){
    digitalWrite(Merah, HIGH);
    digitalWrite(Kuning, LOW);
    digitalWrite(Biru, LOW);
    digitalWrite(Hijau, LOW);
    noTone(Buzzer);
  }else if(distance > 100 && distance < 200){
    digitalWrite(Merah, LOW);
    digitalWrite(Hijau, LOW);
    digitalWrite(Biru, LOW);
    digitalWrite(Kuning, HIGH);
    noTone(Buzzer);
  }else if (distance > 200 && distance < 300){
    digitalWrite(Merah, LOW);
    digitalWrite(Kuning, LOW);
    digitalWrite(Biru, LOW);
    digitalWrite(Hijau, HIGH);
    noTone(Buzzer);
  }else if(distance > 300){
    digitalWrite(Merah, LOW);
    digitalWrite(Kuning, LOW);
    digitalWrite(Hijau, LOW);
    digitalWrite(Biru, HIGH);
    tone(Buzzer,150);
  }else{
    digitalWrite(Merah, LOW);
    digitalWrite(Kuning, LOW);
    digitalWrite(Hijau, LOW);
    digitalWrite(Biru, LOW);
    noTone(Buzzer);
  }
}