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

// Inisialisasi LCD: alamat 0x27, ukuran 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pin switch level
#define LOW_PIN    2
#define MID_PIN    3
#define HIGH_PIN   4

// Relay dan buzzer
#define RELAY_PIN   7
#define BUZZER_PIN  6

bool pumpOn = true;  // Status pompa ON di awal

void setup() {
  pinMode(LOW_PIN, INPUT_PULLUP);
  pinMode(MID_PIN, INPUT_PULLUP);
  pinMode(HIGH_PIN, INPUT_PULLUP);

  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Pompa ON saat awal (relay aktif high)
  digitalWrite(RELAY_PIN, HIGH);
  digitalWrite(BUZZER_PIN, LOW);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Water Level");
  lcd.setCursor(0, 1);
  lcd.print("Monitoring...");
  delay(2000);
  lcd.clear();

  Serial.begin(9600);
}

void loop() {
  bool lowLevel = digitalRead(LOW_PIN) == LOW;
  bool midLevel = digitalRead(MID_PIN) == LOW;
  bool highLevel = digitalRead(HIGH_PIN) == LOW;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Level Air:");

  if (highLevel) {
    lcd.setCursor(0, 1);
    lcd.print("TINGGI (FULL)");
    pumpOn = false;                      // Matikan pompa
    digitalWrite(RELAY_PIN, LOW);      // Relay OFF
    digitalWrite(BUZZER_PIN, HIGH);     // Buzzer ON
  } 
  else if (lowLevel) {
    lcd.setCursor(0, 1);
    lcd.print("RENDAH (ISI)");
    pumpOn = true;                      // Hidupkan pompa
    digitalWrite(RELAY_PIN, LOW);       // Relay ON
    digitalWrite(BUZZER_PIN, LOW);      // Buzzer OFF
  } 
  else if (midLevel) {
    lcd.setCursor(0, 1);
    lcd.print("SEDANG"); // Menampilkan "SEDANG" di LCD
    // Tidak ubah status pompa
    digitalWrite(BUZZER_PIN, LOW);
  } 
  else {
    lcd.setCursor(0, 1);
    lcd.print("TIDAK TERDETEKSI");
    pumpOn = false;
    digitalWrite(RELAY_PIN, HIGH);
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(1000);
}