#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Inisialisasi objek LCD dengan modul I2C
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Inisialisasi pin untuk sensor ultrasonik
const int trigPin = 9;
const int echoPin = 10;

void setup() {
  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Water Level: ");
  pinMode(13, OUTPUT);

  // Inisialisasi pin untuk sensor ultrasonik
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Tunggu sebentar agar sensor ultrasonik stabil
  delay(1000);
}

void loop() {
  // Kirim sinyal ultrasonik
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Baca durasi pantulan gelombang ultrasonik
  long duration = pulseIn(echoPin, HIGH);

  // Hitung jarak dalam sentimeter
  float distance = duration / 58.2;  // Kalkulasi berdasarkan kecepatan suara

   String waterStatus;
   String waterPercent;
  if (distance < 2) {
    waterStatus = "Air Penuh";
    waterPercent = "100%";
    digitalWrite(13, LOW);
  } else if (distance >= 2 && distance <= 80) {
    int waterLevelPercent = map(distance, 2, 80, 100, 20);
    waterStatus = "Terisi ";
    waterPercent = String(waterLevelPercent) + "%";
    digitalWrite(13, LOW);
  } else {
    int waterLevelPercent = map(distance, 81, 100, 19, 0);
    waterStatus = "Air Kurang ";
    waterPercent = String(waterLevelPercent) + "%";
    digitalWrite(13, HIGH);
  }

  // Tampilkan status di LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(waterStatus);
  lcd.setCursor(0, 1);
  lcd.print(waterPercent);

  // Tunggu sebentar sebelum mengukur ulang
  delay(1000);
}