#include <Keypad.h>  // เรียกใช้ library kaypad
#include <Wire.h>  // เรียกใช้ไลบรารี่ I2C
#include <LiquidCrystal_I2C.h> //เรียกใช้ไลบรารี่จอ LCD_I2C
#include "RTClib.h"

LiquidCrystal_I2C lcd(0x27, 20, 4);
RTC_DS1307 rtc;


const byte KEYPAD_ROWS = 4;  
const byte KEYPAD_COLS = 4;  
byte rowPins[KEYPAD_ROWS] = {2, 3, 4, 5};
byte colPins[KEYPAD_COLS] = {A0, A1, A2, A3}; 

char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

void setup(){  
  pinMode(6, OUTPUT);

  LiquidCrystal_I2C lcd(0x27,20,4);
  lcd.init(); 
  if (! rtc.begin()) {
    Serial.println("-----");
    Serial.flush();
    abort();
  }   

} 
void loop(){
  DateTime now = rtc.now();
  lcd.backlight();
  lcd.setCursor (6, 0);
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);
  lcd.setCursor (0, 0);
  lcd.print("");

  LiquidCrystal_I2C lcd(0x27,20,4); //lcd.init();
  char key = keypad.getKey();
  if(key=='1'){digitalWrite(6,HIGH);
  lcd.setCursor(6,2);
  lcd.print("LED : ON "); 
  }

  if(key=='2'){digitalWrite(6,LOW);
  lcd.setCursor(6,2);
  lcd.print("LED : OFF");
  }
}