#include <LiquidCrystal.h>
#include <Keypad.h>

/* Display */
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

const String sel_npm = "2332047";
String result;
int is_right = 0;
int cursorColumn = 5;
// Cara Membaca Input Dari Keypad Adalah 
// keypad.getKey()

void setup() {
  lcd.begin(16, 2);
  lcd.setCursor(3,0);
  lcd.print("Input NPM");
}

void loop() {
 char key = keypad.getKey();
 String result ="";
 while (result.length() <7)
 {
 char key = keypad.getKey();
    if (key >= '0' && key <= '9')
    {
      lcd.setCursor(cursorColumn,1);
      lcd.print(key);
      cursorColumn ++;
      result += key;
    }
 }
      if(sel_npm == result){
        lcd.clear();
        lcd.setCursor(5,0);
        lcd.print("Rudy");
        delay(1500);
        cursorColumn = 5;
        lcd.clear();
        lcd.setCursor(3,0);
        lcd.print("Input NPM");
      }
      else{
        lcd.clear();
        lcd.setCursor(3,0);
        lcd.print("NPM Salah");
        delay(1500);
        cursorColumn = 5;
        lcd.clear();
        lcd.setCursor(3,0);
        lcd.print("Input NPM");
      }
    }