#include <Keypad.h>

const uint8_t x = 4;
const uint8_t y = 4;

uint8_t pinBaris[x]={9,8,7,6};
uint8_t pinKolom[y]={5,4,3,2};

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

Keypad k = Keypad(makeKeymap(keys), pinBaris, pinKolom, x, y);
String password1 = "1589";
String password2 = "";
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

}

void loop() {
  // put your main code here, to run repeatedly:
  char baca = k.getKey();
  
  if(baca!=NO_KEY){
    if(baca == 'D') {
      if(password1==password2);
      Serial.println("Password Benar");
    } else 
      Serial.println("Password Salah");
  
    } else {
      password2 = password2 + baca;
      Serial.println(password2);
    }
}