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RFID-Enabled Door Lock System with SMS-Based Remote Control

An integrated security system built on Arduino that combines RFID authentication, keypad-based password entry, and SMS communication via the SIM800 module. This project demonstrates a secure, remotely operable door locking mechanism with real-time alerts and dual-factor authentication.

🚀 Features

  • RFID Authentication: Validates access using a unique RFID tag via the MFRC522 module.
  • Password Protection: Requires a secondary 4-digit password for added security.
  • SMS-Based Control: Enables remote operation (open / close) through SMS using the SIM800 GSM module.
  • Real-Time Alerts: Sends SMS notifications on unauthorized access attempts or successful entries.
  • Visual & Audible Feedback: Uses LEDs and buzzer to indicate access status.
  • Servo-Controlled Locking: Controls a servo motor to physically lock/unlock the door.

🧰 Hardware Components

Component Description
Arduino (Uno/Nano) Microcontroller unit
MFRC522 RFID module
4x4 Keypad For password input
SIM800 GSM Module SMS communication
16x2 LCD (I2C) User interface display
Servo Motor Door lock actuator
Buzzer + LEDs Status indicators

📌 Pin Configuration

Component Arduino Pins
MFRC522 SS (10), RST (9), SPI bus
Keypad Rows: D0–D2, Cols: A0–A3
Servo Motor D8
Green LED D7
Red LED D6
Buzzer D5
SIM800 TX (D3), RX (D4)
LCD (I2C) SDA (A4), SCL (A5)

⚙️ System Workflow

  1. Idle Mode: LCD displays prompt to scan RFID tag.
  2. RFID Scan:
    • If valid tag detected: User is prompted to enter a 4-digit password.
    • If invalid: System denies access and sends an alert via SMS.
  3. Password Entry:
    • If correct: Unlocks door (servo rotates), sends confirmation SMS.
    • If incorrect: Access denied, sends alert SMS.
  4. Remote Control via SMS:
    • Send open to unlock the door remotely.
    • Send close to temporarily disable user interaction mode.

📲 SMS Configuration

The SIM800 module handles SMS functionality.
To set your recipient number, modify the following line:

SIM800.println("AT+CMGS=\"+91xxxxxxxxxx\"");

Replace +91xxxxxxxxxx with your mobile number in international format.

📦 Required Libraries

Ensure these libraries are installed in your Arduino IDE:

  • MFRC522
  • Keypad
  • LiquidCrystal_I2C
  • SoftwareSerial
  • Servo
  • SPI

🔐 Security Considerations

  • Two-factor authentication: RFID + password.
  • SMS alerts notify the user of any unauthorized attempts.
  • Remote shutdown capability enhances control in critical situations.

🔄 Potential Improvements

  • Store multiple RFID tags and passwords in EEPROM or external storage.
  • Add real-time clock (RTC) for timestamped logs.
  • Integrate with a web dashboard or IoT platform (e.g., Blynk, ThingSpeak).
  • Use fingerprint module for biometric authentication.

📷 Media

(Add setup photos, wiring diagram, or demo video link here)

📚 License

This project is open-source and available under the MIT License.