#include <Keypad.h>

//constant for row and column size
const byte Rows=4;
const byte Cols=4;

//array to represent keys on keypad
char hexakeys [Rows][Cols]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
  };

//connections to arduino  
byte rowpins[Rows]={9,8,7,6};
byte colpins[Cols]={5,4,3,2};

//Creating keypad object
Keypad customkeypad=Keypad(makeKeymap(hexakeys),rowpins,colpins,Rows,Cols);


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
char key=customkeypad.getKey();
if(key){
  Serial.println(key);
}
}