#include <Keypad.h>
#include <LiquidCrystal_I2C.h> 
//#include <Wire.h> 
LiquidCrystal_I2C lcd(0x27,16,2);  //設定LCD位置0x27,設定LCD大小為16*2
//#include <LiquidCrystal.h>

//定義4*4 KeyBoard每一按鍵名稱
char key[4][4]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte colPin[4]={5,4,3,2};//按鍵Col分別接到PIN5 PIN4 PIN3 PIN2
byte rowPin[4]={9,8,7,6};//按鍵Row分別接到PIN9 PIN8 PIN7 PIN6

//使用Keypad函式庫
Keypad keypad = Keypad(makeKeymap(key), rowPin, colPin, 4, 4);

//

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
//const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
///const int rs = 12, en = 11, d4 = A5, d5 = A4, d6 = A3, d7 = A2;
///LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
 
int x,y;

void setup() {
  Serial.begin(9600);//鮑率設為9600
//
  lcd.init(); //初始化LCD 
  lcd.backlight(); //開啟背光
  lcd.print("Hi!");
  // set up the LCD's number of columns and rows:
  ///lcd.begin(16, 2);
  // Print a message to the LCD.
  //lcd.print("hello, world!");
  x=0,y=0;
}
 
void loop() {
  // put your main code here, to run repeatedly:
  char key = keypad.getKey();//讀取所按按鍵名稱

  //key不為空值
  if(key!=NO_KEY){
    Serial.println(key);//顯示所按按鍵名稱
    //lcd.setCursor(0, 1);
    lcd.setCursor(x++, y);
    lcd.print(key);
    if(x>15) {
      x=0;
      y++;
      if(y>1) y=0;
    }
  }
//
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  //lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  //lcd.print(millis() / 1000);
}