#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Adafruit_Sensor.h>       // Library Unified Sensor
#include <DHT.h>
#include <DHT_U.h>

// === Definisi Pin ===
#define DHT_SENSOR_PIN 4
#define FAN_PWM_PIN 19
#define LED_WARNING_PIN 2

// === Setup DHT dan LCD ===
#define DHT_SENSOR_TYPE DHT22
DHT_Unified dht(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// === PWM Fan Settings ===
#define PWM_FREQ 5000
#define PWM_RESOLUTION 8

void setup() {
  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  pinMode(LED_WARNING_PIN, OUTPUT);

  // PWM setup untuk fan menggunakan ESP32
  ledcAttach(FAN_PWM_PIN, PWM_FREQ, PWM_RESOLUTION);
  ledcWrite(FAN_PWM_PIN, 0); // Fan off awal

  // Inisialisasi DHT
  dht.begin();
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  dht.humidity().getSensor(&sensor);

  // Pesan awal LCD
  lcd.setCursor(0, 0);
  lcd.print("Mini Greenhouse");
  lcd.setCursor(0, 1);
  lcd.print("Inisialisasi...");
  delay(2000);
  lcd.clear();
}

void loop() {
  sensors_event_t eventTemp, eventHum;
  dht.temperature().getEvent(&eventTemp);
  dht.humidity().getEvent(&eventHum);

  if (isnan(eventTemp.temperature) || isnan(eventHum.relative_humidity)) {
    Serial.println("Gagal baca sensor DHT22!");
    return;
  }

  float temperature = eventTemp.temperature;
  float humidity = eventHum.relative_humidity;

  // Serial monitor
  Serial.print("Suhu: ");
  Serial.print(temperature);
  Serial.print(" °C, Kelembaban: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Tampilkan ke LCD
  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(temperature, 1);
  lcd.print((char)223); // simbol derajat
  lcd.print("C   ");

  lcd.setCursor(0, 1);
  lcd.print("Lembab: ");
  lcd.print(humidity, 1);
  lcd.print("%  ");

  // Kontrol Fan berdasarkan suhu
  if (temperature < 25) {
    ledcWrite(FAN_PWM_PIN, 0);         // Fan mati
  } else if (temperature <= 30) {
    ledcWrite(FAN_PWM_PIN, 128);       // Fan 50%
  } else {
    ledcWrite(FAN_PWM_PIN, 255);       // Fan 100%
  }

  // LED peringatan suhu tinggi
  digitalWrite(LED_WARNING_PIN, temperature > 35 ? HIGH : LOW);

  delay(2000);
}