int PinO = 14;
int Pin1 = 12;
#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;

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

uint8_t colPins[COLS] = { 16, 4, 2, 15 };
uint8_t rowPins[ROWS] = { 19, 18, 5, 17 };

int Pos = 0;
const String Pass = "A9D8";
String InputPass;

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  InputPass.reserve(4);
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(PinO, OUTPUT);
  pinMode(Pin1, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  char key = keypad.getKey();
  if(key){
    Serial.println(key);
  }
  if(key == '*' || key == '#'){
    Pos = 0;
    setLocked(true);
}
if(key == Pass[Pos]){
  Pos++;
}
if(Pos == 6){
  setLocked(false);
}
delay(50);
}

void setLocked(int locked){
  if(locked){
    Serial.print("/nContraseña Incorrecta");
    digitalWrite(Pin1, HIGH);
    delay(5000);
    digitalWrite(Pin1, LOW);

  }else{
    Serial.print("/nContraseña Correcta");
    digitalWrite(PinO, HIGH);
    delay(5000);
    digitalWrite(PinO, LOW);
  }
}