How RFID Card/Tag Memory System Works | MFRC522 | ESP32 | 13.5 Mhz RFID Card | RoboXpert.

In this video, I’ll explain how the memory system of an RFID card or tag works — using the MFRC522 module with the ESP32 at 13.56 MHz . 💳⚡

You’ll learn how data is stored inside an RFID card, how memory blocks and sectors are arranged, and how you can use them to read, write, and manage personal data like name, ID, or phone number directly from your ESP32.

🔹 What You’ll Learn:

How RFID cards communicate at 13.56 MHz
Understanding MIFARE 1K memory layout (sectors, blocks, and data bytes)
Difference between data blocks and sector trailers
What happens when you overwrite a block (and how to avoid locking your card)
How the MFRC522 RFID reader interacts with these memory blocks
How to safely read & write using the Arduino_MFRC522v2 library in Arduino IDE

📘 Hardware Used:

ESP32 Development Board
MFRC522 RFID Reader Module
13.56 MHz RFID Card & Keychain Tag
Jumper Wires & Breadboard

🔧 Software:

Arduino IDE
Arduino_MFRC522v2 Library

This video is perfect for students, hobbyists, and engineers learning about RFID memory architecture and data handling using microcontrollers.

If you enjoyed this explanation and want to see practical projects like RFID Smart ID Card , RFID Attendance System , and ESP32-based IoT Projects , make sure to subscribe to [@Roboxpert](   / @roboxpert  ) and hit the 🔔 bell icon for upcoming tutorials!

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