RC522 RFID Reader Writer SPI Module with Card & Tag

RC522 RFID Reader Writer SPI Module with Card & Tag

The RC522 RFID module is based on the NXP MFRC522 IC — a highly integrated, low-power 13.56 MHz contactless communication chip. It supports ISO/IEC 14443A / MIFARE and communicates via SPI at up to 10 Mbit/s. This module is widely used in access control, attendance systems, smart lockers, and IoT security projects.

Specifications

Features

• Highly integrated analog circuitry for demodulation and response decoding
• ISO/IEC 14443A / MIFARE standard — compatible with most commercial RFID cards and tags
• SPI interface up to 10 Mbit/s — fast, reliable for real-time applications
• 64-byte FIFO buffer for efficient send and receive operations
• Flexible interrupt modes for low-overhead MCU integration
• Software power-down mode for battery-powered deployments
• Programmable timer, CRC coprocessor, and internal self-test
• 2.5V to 3.3V supply range

How It Works

The RC522 generates a 13.56 MHz electromagnetic field via its onboard antenna. When a compatible RFID card or tag enters the field (within ~50 mm), it powers up inductively and exchanges data with the module. The MFRC522 decodes the response and passes the card UID and payload to the host microcontroller over SPI.

Common Applications

• Door access control and smart lock systems
• Student and employee attendance systems
• Library book and asset tracking
• Smart locker and vending machine authentication
• Contactless payment prototypes
• IoT identity verification and security projects

SPI Wiring Reference

⚠ Warning: Always connect VCC to 3.3V only. Connecting to 5V will permanently damage the module.

Package Contents

• 1 × RFID RC522 Reader/Writer Module
• 1 × Blank ISO RFID Card (1K S50)
• 1 × Keychain RFID Tag
• 1 × Straight pin header strip
• 1 × Right-angle pin header strip