#include <Keypad.h>

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

byte pinBaris[] = {2, 3, 4, 5};
byte pinKolom[] = {6, 7, 8, 9};
Keypad keypad = Keypad(makeKeymap(tombol), pinBaris, pinKolom, 4, 4);

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

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