#include <Keypad.h>
const byte ROWS = 4;
const byte COLS =  4; 
char hexaKeys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; 
byte colPins[COLS] = {5, 4, 3, 2};
String password = "3100";
String key_pass = "";

Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup(){
Serial.begin(9600);
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
}
 
 void loop(){
 char customKey = customKeypad.getKey();
 if (customKey){
 if(customKey == '*') {
 if(key_pass == password) {
 Serial.println("Password Benar");
 digitalWrite(13, HIGH);
 digitalWrite(12, HIGH);
 digitalWrite(11, HIGH);
 digitalWrite(10, HIGH);
 delay(6000);
 digitalWrite(13, LOW);
 digitalWrite(12, LOW);
 digitalWrite(11, LOW);
 digitalWrite(10, LOW);
 key_pass = "";

  } 
  else {
   Serial.println("Password Salah! Ulangi lagi");
    key_pass = "";
     }
      } else if(customKey == 'D') 
      {
      Serial.println("Data Input dihapus, Silahkan Masukan Password lagi");
      key_pass = "";
      } else {
      key_pass += customKey;
      Serial.println(key_pass);
       }
        }
         }
         //ekaaa