RC522 RFID Module for Arduino & Raspberry PI

The RC522 RFID Module for Arduino & Raspberry PI enables wireless contactless communication with RFID cards and tags at 13.56MHz. It supports MIFARE Classic cards for access control, identification, and contactless data applications.

Key Features

• 13.56MHz frequency ISO 14443A compliant
• Supports MIFARE Classic 1K and 4K cards
• SPI/I2C/UART interfaces for flexible connection
• Read/Write capability for card data storage
• 3.3V operation with 5V tolerant input pins
• Built-in antenna with up to 10cm range
• Compact module with included card and key fob

Technical Specifications

Applications

• Access control systems and door entry
• Attendance tracking and time management
• Inventory management and asset tracking
• Contactless payment prototypes
• Smart lockers and secure storage
• Membership and loyalty systems

Pinout

• 3.3V: Power supply (3.3V only for logic pins)
• GND: Ground
• RST: Reset pin
• IRQ: Interrupt pin (optional)
• MISO/MOSI/SCK: SPI interface
• SDA (SS): SPI chip select

Important Notes

• Module operates at 3.3V – do not connect 5V directly to data pins
• Use MFRC522 library by miguelbalboa for Arduino
• Default I2C address conflicts may occur – use SPI for best results
• Card must be within a few centimeters for reliable reading
• MIFARE Classic security is compromised – not for high-security applications