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

// Konfigurasi DHT
#define DHTPIN 4      // Pin sensor DHT
#define DHTTYPE DHT22 // Jenis sensor DHT
DHT dht(DHTPIN, DHTTYPE);

// Konfigurasi LCD
LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat I2C (0x27 atau 0x3F tergantung modul)

// Konfigurasi LED
#define LED_HIJAU 25
#define LED_KUNING 26
#define LED_MERAH 27

void setup() {
  // Inisialisasi Serial Monitor
  Serial.begin(115200);

  // Inisialisasi DHT
  dht.begin();

  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("DHT22 Monitoring");
  delay(2000);
  lcd.clear();

  // Inisialisasi LED
  pinMode(LED_HIJAU, OUTPUT);
  pinMode(LED_KUNING, OUTPUT);
  pinMode(LED_MERAH, OUTPUT);
}

void loop() {
  // Membaca data suhu dan kelembapan
  float suhu = dht.readTemperature();
  float kelembapan = dht.readHumidity();

  // Memastikan pembacaan sensor berhasil
  if (isnan(suhu) || isnan(kelembapan)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    digitalWrite(LED_HIJAU, LOW);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_MERAH, HIGH); // Nyalakan merah sebagai tanda error
    delay(2000);
    return;
  }

  // Menampilkan data ke Serial Monitor
  Serial.print("Suhu: ");
  Serial.print(suhu);
  Serial.println(" °C");
  Serial.print("Lembap: ");
  Serial.print(kelembapan);
  Serial.println(" %");

  // Menampilkan data ke LCD
  lcd.setCursor(0, 0);
  lcd.print("Suhu  : ");
  lcd.print(suhu);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Lembap: ");
  lcd.print(kelembapan);
  lcd.print(" %");

  // Logika Indikator LED
  if (kelembapan >= 40 && kelembapan <= 60) {
    digitalWrite(LED_HIJAU, HIGH);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_MERAH, LOW);
  } else if ((kelembapan >= 20 && kelembapan < 40) || (kelembapan > 60 && kelembapan <= 80)) {
    digitalWrite(LED_HIJAU, LOW);
    digitalWrite(LED_KUNING, HIGH);
    digitalWrite(LED_MERAH, LOW);
  } else {
    digitalWrite(LED_HIJAU, LOW);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_MERAH, HIGH);
  }

  delay(2000); // Perbarui data setiap 2 detik
}