#include <Wire.h> 
#include <LiquidCrystal_I2C.h> 
#include <RTClib.h> 
#include <DHT.h> 
// === KONFIGURASI PIN === 
#define DHTPIN 12 
#define PIRPIN 11 
#define LDRPIN A3 
#define LEDPIN 11 
#define FANPIN 10
#define DHTTYPE DHT22 
// === INISIALISASI OBJEK === 
LiquidCrystal_I2C lcd(0x27, 20, 4); 
RTC_DS3231 rtc; 
DHT dht(DHTPIN, DHTTYPE); 
 
// === PARAMETER KONTROL === 
float batasSuhu = 30.0;       // suhu batas nyala kipas 
int batasLdr = 500;           // nilai LDR untuk kondisi gelap 
 
void setup() { 
  Serial.begin(9600); 
  lcd.init(); 
  lcd.backlight(); 
   
  dht.begin(); 
  rtc.begin(); 
 
  pinMode(PIRPIN, INPUT); 
  pinMode(LDRPIN, INPUT); 
  pinMode(LEDPIN, OUTPUT); 
  pinMode(FANPIN, OUTPUT); 
 
  lcd.setCursor(0, 0); 
  lcd.print("Sistem Otomatis"); 
  lcd.setCursor(0, 1); 
  lcd.print("Sensor & RTC Ready"); 
  delay(2000); 
  lcd.clear(); 
} 
 
void loop() { 
  // === BACA SENSOR === 
  float suhu = dht.readTemperature(); 
  float kelembapan = dht.readHumidity(); 
  int nilaiLdr = analogRead(LDRPIN); 
  bool gerakan = digitalRead(PIRPIN); 
 
  DateTime now = rtc.now(); 
  int jam = now.hour(); 
  int menit = now.minute(); 
  int detik = now.second(); 
 
  // === KONTROL KIPAS === 
  if (suhu > batasSuhu) { 
    digitalWrite(FANPIN, HIGH); 
  } else { 
    digitalWrite(FANPIN, LOW); 
  } 
 
  // === KONTROL LAMPU === 
  bool malam = (nilaiLdr > batasLdr);     // LDR besar = gelap 
  bool jamMalam = (jam >= 23 || jam < 5); // malam hari 
 
  if (malam || jamMalam) { 
    digitalWrite(LEDPIN, HIGH); 
  } else { 
    digitalWrite(LEDPIN, LOW); 
  } 
 
  // === TAMPILKAN DATA KE LCD === 
  lcd.setCursor(0, 0); 
  lcd.print("Waktu: "); 
  if (jam < 10) lcd.print("0"); 
  lcd.print(jam); 
  lcd.print(":"); 
  if (menit < 10) lcd.print("0"); 
  lcd.print(menit); 
 
  lcd.setCursor(0, 1); 
  lcd.print("Suhu: "); 
  lcd.print(suhu, 1); 
  lcd.print((char)223); 
  lcd.print("C "); 
 
  lcd.setCursor(0, 2); 
  lcd.print("Kelembapan: "); 
  lcd.print(kelembapan, 1); 
  lcd.print("%   "); 
 
  lcd.setCursor(0, 3); 
  lcd.print("Lampu:"); 
  lcd.print(digitalRead(LEDPIN) ? "ON " : "OFF"); 
  lcd.print(" Fan:"); 
  lcd.print(digitalRead(FANPIN) ? "ON " : "OFF"); 
 
  delay(1000); 
}