const int ledPins[] = {5, 6, 7, 8, 9, 10, 11, 12, 13}; // Pin LED
const int trigPin = 3; // Pin TRIG sensor ultrasonik
const int echoPin = 2; // Pin ECHO sensor ultrasonik
const int buzzerPin = A0; // Pin buzzer
const int ledPin = 4; // Pin buzzer

void setup() {
  Serial.begin(9600); // Untuk debugging
  for (int i = 0; i < 9; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2; // Menghitung jarak dalam cm
  
  // Mengontrol LED berdasarkan level air
  for (int i = 0; i < 9; i++) {
    if (distance <= (9 - i) * 4) { // Asumsi: setiap LED mewakili 10cm level air
      digitalWrite(ledPins[i], LOW);
    } else {
      digitalWrite(ledPins[i], HIGH);
    }
  }
  
  // Mengontrol buzzer berdasarkan level air
  if (distance > 39) { // Contoh: jika level air kurang dari 10cm, nyalaan buzzer
    digitalWrite(buzzerPin, HIGH);
  } else {
    digitalWrite(buzzerPin, LOW);
  }
   if (distance > 35) { // Contoh: jika level air kurang dari 10cm, nyalaan buzzer
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  } 
  // Tambahkan kode untuk komunikasi dengan aplikasi Android melalui Serial (Bluetooth) jika diperlukan
  Serial.print("Distance: ");
  Serial.println(distance);
  delay(1000);
}