#include <Keypad.h>
// #include <Tone.h>

const int ROW_NUM = 4; // Four rows
const int COLUMN_NUM = 3; // Three columns
#define buzzer 10
// Define the keypad matrix
char keys[ROW_NUM][COLUMN_NUM] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; // Connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3}; // Connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);
// Tone speaker;

const String correctPassword = "1234";
String enteredPassword = "";

const int relayPin = 2;

void setup() {
  Serial.begin(9600);
  pinMode(relayPin, OUTPUT);
  pinMode(buzzer,OUTPUT);
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    tone(buzzer, 200,100); // Play a tone when a key is pressed
    Serial.print(key); // Print the key value to serial monitor
    
    if (key == '#') {
      if (enteredPassword == correctPassword) {
        Serial.println(" - Password correct");
        tone(buzzer,400,500);
        digitalWrite(relayPin, HIGH); // Trigger the relay
      } else {
        Serial.println(" - Password incorrect");
        tone(buzzer,800,500);
      }
      
      enteredPassword = ""; // Reset the entered password
    } else {
      enteredPassword += key;
    }
  }
}