RFID-Based Door Lock with Arduino

Secure your door with an RFID system using Arduino, granting access only to authorized users with simple serial communication.

BeginnerFull instructions provided292

Things used in this project

Hardware components

Arduino UNO

Processes the RFID data and controls the relay based on tag verification.

EM-18 Reader Module

Scans RFID tags for access control.

ControlEverything.com 1-Channel Signal Relay 1A SPDT I²C Mini Module

Switches the lock on or off based on the RFID tag's validity.

Solenoid lock

Secures the door and is activated by the relay.

PSD3304 Power Source

Provides power to the system components.

Jumper wires (generic)

For making necessary connections between components.

Software apps and online services

Arduino IDE

Used to write, upload, and run the code on the Arduino Uno.

Story

Aim

Develop a secure and convenient access control system using RFID technology to enhance security and streamline entry processes.

Working

1. Tag Scanning:

The EM-18 RFID reader scans the RFID tag when presented.

2. Data Transmission:

The reader sends the tag's unique ID to the Arduino Uno.

3. Authorization Check:

The Arduino compares the ID against a list of authorized IDs.

4. Access Decision:

•If the ID is authorized, the Arduino activates the relay to unlock the electronic lock.

•If the ID is not authorized, the relay remains inactive, keeping the lock secure.

MERITS

Enhanced security through RFID authentication.
Convenience of keyless entry.
Easy to use and install.
Potential for future upgrades (e.g., mobile app integration).

The RFID Door Lock System represents a modern approach to access control, merging security with convenience. By utilizing RFID technology, this project not only simplifies entry but also paves the way for future enhancements. As technology continues to evolve, systems like this will play a crucial role in creating safer environments for homes and businesses alike.

Unlock the future of security!

Code

Code Implementation: RFID Door Lock System

#include <SoftwareSerial.h>  // Include the SoftwareSerial library for serial communication with RFID reader

// Define RX and TX pins for SoftwareSerial communication
SoftwareSerial rfSerial(10, 11);

// Define the pin connected to the door lock (relay or motor)
int lock = 12;

// Create character arrays for storing RFID tag ID
char id[13];        // Stores the scanned RFID tag ID
char id1[13] = "6F0087C991B0";  // Predefined authorized RFID tag ID

void setup() {
  Serial.begin(9600);       // Initialize hardware serial communication at 9600 baud rate
  rfSerial.begin(9600);     // Initialize software serial communication for RFID reader
  pinMode(lock, OUTPUT);    // Set lock pin as output
  digitalWrite(lock, 1);    // Keep the door locked initially (HIGH signal to lock pin)
}

void loop() {
  rfid();  // Continuously check for RFID tags
}

void rfid() {
  // Check if data is available from the RFID reader
  if (rfSerial.available() > 0) {
    rfSerial.readBytesUntil('\0', id, 12);  // Read the RFID tag ID
    id[12] = '\0';                          // Terminate the string with null character
    
    // Compare the scanned RFID ID with the predefined authorized ID
    if (strcmp(id, id1) == 0) {
      Serial.println("HELLO ACCESS GRANTED");  // Print success message
      digitalWrite(lock, 0);                   // Unlock the door (LOW signal to lock pin)
      delay(3000);                             // Keep the door unlocked for 3 seconds
      digitalWrite(lock, 1);                   // Lock the door again (HIGH signal)
    } else {
      digitalWrite(lock, 1);  // Keep the door locked if the RFID ID does not match
      Serial.println("PLEASE PROVIDE RIGHT DETAILS ACCESS DENIED");  // Print error message
    }
  }
}