🔐 RFID-Based Smart Security System using Arduino UNO

📌 Project Overview

This project is an RFID-based smart security system developed using Arduino UNO, MFRC522 RFID module, and DS3231 RTC module.

The system verifies authorized RFID cards and logs the access time using a Real-Time Clock (RTC). An LED indicator provides visual feedback for successful authentication.

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🛠 Hardware Components Used

• Arduino UNO
• MFRC522 RFID Module
• DS3231 RTC Module
• LED (with 220Ω resistor)
• Breadboard
• Jumper Wires

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⚙ System Working

1. When an RFID card is scanned:
   • The system reads the card UID.
2. The UID is compared with a pre-defined authorized UID.
3. If matched:
   • Access is granted.
   • LED turns ON.
   • Current date & time is displayed in Serial Monitor.
4. If not matched:
   • Access is denied.
   • Access attempt is still logged with timestamp.

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🔌 Pin Configuration

RFID RC522 → Arduino UNO

RFID Pin	Arduino Pin
SDA	D10
SCK	D13
MOSI	D11
MISO	D12
RST	D9
3.3V	3.3V
GND	GND

RTC DS3231 → Arduino UNO

RTC Pin	Arduino Pin
SDA	A4
SCL	A5
VCC	5V
GND	GND

LED

D3 → 220Ω resistor → LED (+)
LED (-) → GND

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🔧 Hardware Setup

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💻 Software & Libraries Used

• Arduino IDE
• MFRC522 Library
• RTClib (Adafruit)
• SPI Library
• Wire Library

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📊 Project Status

This project was built and tested as part of an academic submission.
The system was verified during implementation and successfully demonstrated RFID authentication with real-time logging.

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🚀 Future Improvements

• Add Servo motor for door lock mechanism
• Add buzzer alert system
• Store logs in EEPROM or SD card
• Web dashboard integration (IoT-based system)

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👩‍💻 Author

Shalini Kumari