#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#define  OnBoardLED 13
LiquidCrystal_I2C myLCD(0x27,20,4);
RTC_DS1307 myRTC;

void setup() 
{
  pinMode(OnBoardLED, OUTPUT);
  Serial.begin(9600);
  Serial.println("Hello ENE of RMUTI Khonkaen");
  myLCD.init();
  myLCD.backlight();
  myLCD.setCursor(0,0); myLCD.print("siriwan");
  myLCD.setCursor(1,3); myLCD.print("jadnok");
  myRTC.begin();
}
unsigned char Cx=0;
unsigned long PrevTime,NowTime;
DateTime  RTC_Now;
void loop()
{
  
  NowTime = millis();
  if(NowTime >= (PrevTime + 100))
  {
    if(Cx==0) digitalWrite(OnBoardLED, HIGH);
    else if(Cx==3) digitalWrite(OnBoardLED, LOW);
    if (Cx == 9)
   {
    RTC_Now = myRTC.now();
    myLCD.setCursor(0,1); myLCD.print(RTC_Now.hour());
    myLCD.print(":");
    myLCD.print(RTC_Now.minute());
    myLCD.print(":");
    myLCD.print(RTC_Now.second());
    //--------------------------------
    myLCD.setCursor(10,1); myLCD.print(RTC_Now.day());
    myLCD.print("/"); myLCD.print(RTC_Now.month());
    myLCD.print("/"); myLCD.print(RTC_Now.year());
   }
   else Cx++;
   PrevTime = NowTime;
  }
}