#include "keypad.h"
const byte ROWS=4;
const BYTE COLS=4;
Char keys[ROWS][COLS]={

                     {'1','2','3','A'},
                     {'4','5','6','B'},
                     {'7','8','9','C'},
                     {'$','0','#','D'} 
};
byte rPins[ROWS]={9,8,7,6};
byte cpins[COLS]={5,4,3,2};
keypad keypad=keypad(makekeymap(keys))
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}