Circuit Diagram:

The Working

When powered on, the system reads data from the EEPROM and displays the attendance count with a real-time clock. Logging of check-ins and check-outs happens when an RFID card is tapped.

Instant Feedback becomes available on the LCD:-

When a valid RFID card is scanned, the system checks whether the user is entering or exiting. For a check-in, it displays “CHECKED IN” on the LCD and increases the count by one. For a check-out, it shows “CHECKED OUT” and decreases the count by one. If an unregistered or invalid card is used, the system displays “ACCESS DENIED.”

For a complete step-by-step guide, visit this RFID-based attendance system using Arduino project.