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

#define DHTPIN 5
#define DHTTYPE DHT22

#define RELAY_HEATER 16
#define RELAY_FAN 4


DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

unsigned long lastFanToggle = 0;
bool fanState = false;
bool finished = false;

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();

  pinMode(RELAY_HEATER, OUTPUT);
  pinMode(RELAY_FAN, OUTPUT);
  digitalWrite(RELAY_HEATER, LOW);
  digitalWrite(RELAY_FAN, LOW);


}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print(" C   ");

  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(h);
  lcd.print(" %   ");

  if (isnan(h) || isnan(t)) {
    Serial.println("Sensor error!");
    return;
  }

  if (!finished) {
    // CASE 1: Proses berjalan
    if (h > 40 && t < 100) {
      digitalWrite(RELAY_HEATER, HIGH);

      
      // Kipas 2s ON 5s OFF
      unsigned long now = millis();
      if (fanState && now - lastFanToggle >= 2000) {
        fanState = false;
        digitalWrite(RELAY_FAN, LOW);
        lastFanToggle = now;
      } else if (!fanState && now - lastFanToggle >= 5000) {
        fanState = true;
        digitalWrite(RELAY_FAN, HIGH);
        lastFanToggle = now;
      }
    }
    // CASE 2: Target tercapai
    else if (h <= 40 && t >= 100) {
      digitalWrite(RELAY_HEATER, LOW);
      digitalWrite(RELAY_FAN, LOW);
    

      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("Process Done");
      lcd.setCursor(4, 1);
      lcd.print("Finish!");
      finished = true;
    }
    // CASE 3: Hanya suhu tinggi tapi kelembapan belum cukup
    else {
      digitalWrite(RELAY_HEATER, LOW);

      if (t > 30) {
        digitalWrite(RELAY_FAN, HIGH);
      } else {
        digitalWrite(RELAY_FAN, LOW);
      }

   
    }
  }

  delay(500); // Sampling
}