#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
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}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

Keypad Teclado = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 
const String password = "1234"; 
String input_password;

void setup(){
  Serial.begin(9600);
  pinMode(10, OUTPUT);//led
  pinMode(11, OUTPUT);//buzzer
  pinMode(12, OUTPUT);//led
  input_password.reserve(32); 
}
  
void loop(){
  char customKey = Teclado.getKey();
  
  if (customKey){
    Serial.println(customKey);
    if(customKey == '*') {
      input_password = ""; 
    } else if(customKey == '#') {
      if(password == input_password) {
        Serial.println("Contraseña Correcta :D");
        tone(11,440,2000);//PIN, TONO ,DURACION
        delay(2000);
        tone(11,480,2000);//PIN, TONO ,DURACION
        delay(1000);
        tone(11,550,2000);//PIN, TONO ,DURACION
        delay(500);
        digitalWrite(12,HIGH);
        delay(500);
        digitalWrite(12, LOW); 
          
      } else {
        Serial.println("Contraseña Incorrecta, intentalo de nuevo");
        tone(11,700,1000);//PIN, TONO ,DURACION
        delay(500);        
        digitalWrite(10, HIGH);
        delay(500);
        digitalWrite(10, LOW);
      }

      input_password = ""; 
    } else {
      input_password += customKey; 
    }
  }


}