#include <SD.h> //Library untuk mengakses dan mengatur kartu SD.
#include <DHT.h> //Library untuk sensor suhu dan kelembaban DHT.
#include <RTClib.h> //
#include <LiquidCrystal_I2C.h> //

#define DHTPIN 8     
#define DHTTYPE DHT22   

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};

long seconds=00;
long minute=00;
long hours=00;

LiquidCrystal_I2C lcd(0x27, 20, 4); // Inisialisasi LCD I2C 20x4 dengan alamat 0x27

int CS_pin = 10;

DHT dht(DHTPIN, DHTTYPE);
File sd_file;

float lastTemp = 0;
float lastHum = 0;

void setup()  {
  DateTime now = rtc.now();
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();

  // SD Card Initialization
  if (SD.begin())  {
    Serial.println("SD card is initialized. Ready to go");
  } 
  else  {
    Serial.println("Failed");
    return;
  }

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }

  File sd_file = SD.open("data.txt", FILE_WRITE);

  if (sd_file)  {
    Serial.print("Hari");
    Serial.print("  ");
    Serial.print("Tgl");
    Serial.print("/");
    Serial.print("Bln");
    Serial.print("/");
    Serial.print("Thn");
    Serial.print("   ");
    Serial.print("Waktu");
    Serial.print("   ");
    Serial.print("Suhu(C)");
    Serial.print("  ");
    Serial.print("Kelembaban(%)");
    Serial.println(); // Newline to end the line
    
    sd_file.print("Hari");
    sd_file.print("  ");
    sd_file.print("Tgl");
    sd_file.print("/");
    sd_file.print("Bln");
    sd_file.print("/");
    sd_file.print("Thn");
    sd_file.print("   ");
    sd_file.print("Waktu");
    sd_file.print("   ");
    sd_file.print("Suhu(C)");
    sd_file.print("  ");
    sd_file.print("Kelembaban(%)"); // Newline to end the line
  }
  sd_file.close(); //closing the file
} 

void loop()  {
  DateTime now = rtc.now();
  float hum = dht.readHumidity(); // Reading the humidity
  float temp = dht.readTemperature(); // Reading the temperature
  
  // Update minute
  minute = now.minute();

  // Update seconds
  seconds = now.second();

  // Check if the temperature or humidity has changed significantly
  if (abs(temp - lastTemp) >= 0.1 || abs(hum - lastHum) >= 0.1) {
    updateLCD(now, temp, hum);
    lastTemp = temp;
    lastHum = hum;
  }

  // Save data to SD card
  saveData(now, hum, temp);

  delay(3000);
}

void updateLCD(DateTime now, float temp, float hum) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
  lcd.print(", ");
  lcd.print(now.day(), DEC);
  lcd.print("/");
  lcd.print(now.month(), DEC);
  lcd.print("/");
  lcd.print(now.year(), DEC);

  lcd.setCursor(0, 1);
  lcd.print("T&H: ");
  lcd.print(temp, 1);
  lcd.print("C & ");
  lcd.print(hum, 1);
  lcd.print("%");
}

void saveData(DateTime now, float hum, float temp) {
  File sd_file = SD.open("data.txt", FILE_WRITE);
  if (sd_file)  {
    sd_file.print(daysOfTheWeek[now.dayOfTheWeek()]);
    sd_file.print(",  ");
    sd_file.print(now.day(), DEC);
    sd_file.print("/");
    sd_file.print(now.month(), DEC);
    sd_file.print("/");
    sd_file.print(now.year(), DEC);
    sd_file.print("  ");
    sd_file.print(now.hour());
    sd_file.print(":");
    sd_file.print(minute < 10 ? "0" + String(minute) : String(minute));
    sd_file.print(":");
    sd_file.print(seconds < 10 ? "0" + String(seconds) : String(seconds));
    sd_file.print("   ");
    char tempStr[6];
    char humStr[6];
    dtostrf(temp, 4, 1, tempStr); // Mengonversi nilai float temp ke string dengan 1 angka di belakang koma
    dtostrf(hum, 4, 1, humStr); // Mengonversi nilai float hum ke string dengan 1 angka di belakang koma
    sd_file.print(tempStr);
    sd_file.print("     ");
    sd_file.println(humStr); // Newline to end the line

    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(",  ");
    Serial.print(now.day(), DEC);
    Serial.print("/");
    Serial.print(now.month(), DEC);
    Serial.print("/");
    Serial.print(now.year(), DEC);
    Serial.print("  ");
    Serial.print(now.hour());
    Serial.print(":");
    Serial.print(minute < 10 ? "0" + String(minute) : String(minute));
    Serial.print(":");
    Serial.print(seconds < 10 ? "0" + String(seconds) : String(seconds));
    Serial.print("   ");
    Serial.print(tempStr);
    Serial.print("      ");
    Serial.println(humStr); // Newline to end the line

    sd_file.flush(); //saving the file
    sd_file.close();   //closing the file
  } else {
    Serial.println("error opening file");
  }
}