#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#define OnboardLED 13
LiquidCrystal_I2C lcd(0x27,20,4);
RTC_DS1307 myRTC;
unsigned char Cx=0;
unsigned long PrevTime,NowTime;
byte myChar = '0';
float Num1 = 0.5673899999;
DateTime RTC_Now;

void setup() {
  pinMode(OnboardLED, OUTPUT);
  Serial.begin(9600);
  Serial.print("Hello EN of RMUIT khonkkaen");
  lcd.init();
  lcd.backlight();
  lcd.setCursor(5,0);lcd.print("--cvithaya--");
  lcd.setCursor(3,3);lcd.print("We're ENT RMUTI");
  myRTC.begin();
}
void loop() 
{ 
   NowTime = millis();
 if(NowTime >= (PrevTime + 100))
 {
   if(Cx==0)digitalWrite(OnboardLED, HIGH);
   else if(Cx==3) digitalWrite(OnboardLED, LOW);
   if(Cx == 9) {
   Cx = 0;
   }else Cx++;
PrevTime =NowTime;
 }
}
 byte rxBuff[12];
 byte rxCount = 0;
 void serialEvent()
 {
   while(Serial.available())
   {
     rxBuff[rxCount] = Serial.read();
     Serial.write(rxBuff[rxCount]);
     Serial.println("|" + string(rxCount));
     if(rxBuff[0] == 'R')
   {
       if(rxCount ==5) || (rxBuff[exCount] == '#')
   {
     rxCount = 0;
     Serial.println("OK-PASS");
   }else rxCount++;
 }
   }