#define TRIG_PIN 5
#define ECHO_PIN 18
#define BUZZER_PIN 23
#define Merah 14
#define Kuning 27
#define Hijau 26

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(Merah, OUTPUT);
  pinMode(Kuning, OUTPUT);
  pinMode(Hijau, OUTPUT);
}

void loop() {
  long duration;
  float distance_cm;

  // Trigger sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);
  distance_cm = duration * 0.034 / 2;

  Serial.print("Jarak: ");
  Serial.print(distance_cm);
  Serial.println(" cm");
  digitalWrite(Merah, LOW);
  digitalWrite(Kuning, LOW);
  digitalWrite(Hijau, LOW);

  // Untuk Mengaktifkan LED
  if(distance_cm < 100){
    Serial.println(" = Hampir Habis");
    digitalWrite(Merah, HIGH);
  }
  else if(distance_cm > 500){
    Serial.println(" = Sedang !");
    digitalWrite(Kuning, HIGH);
  }
  else if(distance_cm > 950){
    Serial.println(" = Hampir Penuh");
    digitalWrite(Hijau, HIGH);
  }

  // Aktifkan buzzer jika jarak kurang dari 20 cm
  if (distance_cm < 100) {
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(500);
}