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

#define SERIAL_OPTION 0  

LiquidCrystal_I2C lcd(0x27, 16, 2); 
RTC_DS1307 RTC;
const int ledPin = 13; 
unsigned long previousMillis = 0; 
const long interval = 5000; // Interval (5 detik)

void setup() {
  if (SERIAL_OPTION) Serial.begin(9600); 
  lcd.init();  
  lcd.backlight();  
  RTC.begin();
  pinMode(ledPin, OUTPUT); 
}

void loop() {
  DateTime now = RTC.now();

  // Kontrol LED selama 10 detik
  unsigned long currentMillis = millis(); // Current time
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    digitalWrite(ledPin, HIGH);
    // LED menyala selama 1 detik (dari delay)
    delay(1000);
    //mematikan LED setelah jeda 1 detik
    digitalWrite(ledPin, LOW);
  }

  if (SERIAL_OPTION) {
    Serial.print(now.year()); Serial.print("/");
    Serial.print(now.month()); Serial.print("/");
    Serial.print(now.day()); Serial.print(" ");

    Serial.print(now.hour()); Serial.print(":");
    Serial.print(now.minute()); Serial.print(":");
    Serial.print(now.second()); Serial.print("\n");
  }
  
  lcd.setCursor(0,0); lcd.print("TGL: ");
  lcd.print(now.year()); lcd.print("/"); lcd.print(now.month()); lcd.print("/"); lcd.print(now.day());
  lcd.setCursor(0,1); lcd.print("WAKTU: ");
  lcd.print(now.hour()); lcd.print(":"); lcd.print(now.minute()); lcd.print(":"); lcd.print(now.second());

  delay(1000);
}