#include <Keypad.h>

char keys[4][4]={ {'1','2','3','4'},{'5','6','7','8'},{'9','0','A','B'},{'C','D','E','F'}};     //defining      characters of 4X4 Key Matrix

byte rowPin[4]={16,17,5,18};       //declaring the rows and column pins (Port P2)

byte colPin[4]={19,21,22,23};

Keypad keypad=Keypad(makeKeymap(keys),rowPin,colPin,4,4);  // Creating 4X4 Keypad Matrix

void setup()

{

 Serial.begin(9600);  

}

void loop()

{

 char pressed=keypad.getKey();            //This function will fetch the character being pressed

 if(pressed)

 {

 Serial.print("Key pressed = ");

 Serial.println(pressed);

 }

 delay(500);

}