#include <Keypad.h>

const byte ROWS = 4; // Four rows
const byte COLS = 4; // Four columns

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

const int ledPin = 13; // LED connected to digital pin 13
String inputPassword = "";
const String password = "8714";

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW); // Ensure LED is off initially
  Serial.begin(9600);
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    Serial.println(key);
    if (key == 'C') {
      digitalWrite(ledPin, LOW); // Turn off LED
      inputPassword = ""; // Reset input
    } else if (key == '#') {
      if (inputPassword == password) {
        digitalWrite(ledPin, HIGH); // Turn on LED
      }
      inputPassword = ""; // Reset input
    } else {
      inputPassword += key; // Append key to input
    }
  }
}