The Importance and Utility of Digital Door Locks

Digital door locks have become increasingly popular in recent years due to their convenience, security, and versatility. Unlike traditional locks that require physical keys, digital door locks use electronic components and software to control access to a door. This technology offers numerous benefits, such as keyless entry, remote access control, and the ability to track and monitor entry activity. Additionally, digital door locks can be integrated into home automation systems, enhancing overall security and convenience.

Projeto: Creating a Digital Door Lock using Arduino

In this project, we will create a digital door lock using an Arduino board. The objective is to design a system that allows authorized individuals to unlock a door using a password or RFID card, while also providing the ability to remotely control and monitor the lock status.

The functionalities of the digital door lock will include:

1. Password-based unlocking: Users can enter a predefined password using a keypad to unlock the door.
2. RFID card-based unlocking: Users can swipe an RFID card to unlock the door.
3. Remote control: The door lock can be controlled remotely using a smartphone or computer.
4. Activity monitoring: The system will log and display the entry activity, including successful and unsuccessful attempts.

Lista de componentes:

• Arduino Uno board: 1x (https://www.arduino.cc/en/Main/ArduinoBoardUno)
• Keypad module: 1x (https://www.sparkfun.com/products/8653)
• RFID module: 1x (https://www.sparkfun.com/products/11827)
• Servo motor: 1x (https://www.sparkfun.com/products/9065)
• Jumper wires: As required for connections

Exemplos:

Example 1: Password-Based Unlocking

#include <Keypad.h>

const int ROWS = 4; // Number of rows in the keypad
const int COLS = 4; // Number of columns in the keypad

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 String password = "1234"; // Set the password

void setup() {
  Serial.begin(9600);
}

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

  if (key) {
    if (key == '#') {
      if (checkPassword()) {
        // Unlock the door
        unlockDoor();
      } else {
        // Display incorrect password message
        Serial.println("Incorrect password. Try again.");
      }
    }
  }
}

bool checkPassword() {
  String enteredPassword = "";
  char key;

  while ((key = keypad.getKey()) != '#') {
    if (key) {
      enteredPassword += key;
    }
  }

  return enteredPassword == password;
}

void unlockDoor() {
  // Code to unlock the door using a servo motor
}

Example 2: RFID Card-Based Unlocking

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10
#define RST_PIN 9

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance

void setup() {
  Serial.begin(9600);
  SPI.begin(); // Initialize SPI bus
  mfrc522.PCD_Init(); // Initialize MFRC522
}

void loop() {
  // Look for new RFID cards
  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
    // Check if the card UID matches an authorized card
    if (isAuthorizedCard()) {
      // Unlock the door
      unlockDoor();
    } else {
      // Display unauthorized access message
      Serial.println("Unauthorized access detected.");
    }
    mfrc522.PICC_HaltA(); // Halt PICC
    mfrc522.PCD_StopCrypto1(); // Stop encryption on PCD
  }
}

bool isAuthorizedCard() {
  // Code to check if the card UID is authorized
}

void unlockDoor() {
  // Code to unlock the door using a servo motor
}