RFID-Based Attendance System: A Complete Guide

Manual attendance is prone to errors and proxy entries. An RFID-based system eliminates these issues by providing accurate, automated record-keeping.

What is RFID?

Radio Frequency Identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects (or, in this case, ID cards held by students/employees).

Core Components

• Arduino Uno: Microcontroller
• MFRC522 RFID Reader: Reads card UIDs
• RFID Tags/Cards: Each person gets a unique card
• LCD Display (16x2): Shows status ("Access Granted")
• Buzzer: Audio feedback
• RTC Module (DS3231): Timestamps entries

How It Works

1. The user taps their RFID card on the reader.
2. The reader extracts the unique UID (User ID) from the card.
3. Arduino compares this UID against a stored database.
4. If matched, the system logs the attendance with a timestamp and displays "Welcome [Name]".
5. If not matched, the buzzer sounds an alert.

Storing Data

For a basic system, you can store UIDs in the Arduino's EEPROM. For larger deployments, use an SD card module or send data to a Google Sheet via ESP32/WiFi.

See It In Action

Check out our complete kit: RFID Based Attendance System

Why This Project is Great for Exams

It covers databases, communication protocols (SPI), and real-time clocks—all impressive topics for your viva!