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

#define DHTPIN 15
#define DHTTYPE DHT22
#define MOTOR_PIN 18
#define LED_WARNING 19

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

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.init();
  lcd.begin(16, 2);
  lcd.backlight();

  pinMode(MOTOR_PIN, OUTPUT);
  pinMode(LED_WARNING, OUTPUT);
}

void loop() {
  float suhu = dht.readTemperature();
  float kelembaban = dht.readHumidity();

  if (isnan(suhu) || isnan(kelembaban)) {
    lcd.setCursor(0, 0);
    lcd.print("Error sensor!");
    return;
  }

  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(suhu);
  lcd.print(" C ");

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

  // Kontrol "PWM Motor" pakai analogWrite
  if (suhu < 25) {
    analogWrite(MOTOR_PIN, 0);     // OFF
  } else if (suhu <= 30) {
    analogWrite(MOTOR_PIN, 90);   // redup
  } else {
    analogWrite(MOTOR_PIN, 255);   // terang
  }

  // LED warning suhu tinggi
  digitalWrite(LED_WARNING, suhu > 35 ? HIGH : LOW);

  delay(2000);
}