RFID Reader Module Kit — RC522 13.56MHz + 125kHz, SPI, S50 Card, Arduino UNO/Mega

RFID Reader Module Kit RC522 13.56MHz + 125kHz, SPI, S50 Card, Arduino UNO/Mega

$6.16 USD

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RFID Reader Module Kit - RC522 13.56MHz + S50 Card & Keychain, Arduino

The MFRC522 (RC522) is a highly integrated 13.56MHz RFID reader/writer module using the SPI interface for communication with Arduino, ESP32, and STM32. This kit includes the RC522 module, an S50 Mifare 1K card, and a key fob for immediate use in access control, attendance systems, and RFID project development.

Key Specifications

Parameter	Value
Reader IC	MFRC522 (NXP)
Operating Frequency	13.56MHz (ISO/IEC 14443 A)
Interface	SPI (up to 10Mbps)
Supply Voltage	3.3V DC
Read Range	Up to 60mm (card dependent)
Supported Cards	Mifare 1K (S50), Mifare 4K (S70), Mifare Ultralight, NTAG
Card Memory (S50)	1KB (16 sectors x 4 blocks x 16 bytes)
Operating Temperature	-20C to +80C
Module Size	~60 x 40mm

Why Choose RC522?

SPI Interface - Fast 10Mbps SPI; reads card UID in under 50ms
3.3V Operation - Compatible with 3.3V MCUs; use level shifter for 5V Arduino
Read + Write - Full read/write access to Mifare card sectors with authentication
Kit Includes Cards - S50 card and key fob included; start testing immediately
MFRC522 Library - Full Arduino library with examples for UID reading and sector access

Typical Applications

Door access control system (Arduino + relay + RC522)
Employee attendance and time tracking
Library book checkout system
Contactless payment simulation
RFID-based inventory management
Smart locker and safe access control

Arduino Wiring

RC522 Pin	Arduino Uno
SDA (SS)	Pin 10
SCK	Pin 13
MOSI	Pin 11
MISO	Pin 12
RST	Pin 9
3.3V	3.3V
GND	GND

FAQ

Q: Can RC522 read 125kHz EM4100 cards? No - RC522 operates at 13.56MHz (ISO 14443A) only. For 125kHz EM4100/HID cards, use an RDM6300 or EM-18 125kHz reader module.

Q: How do I read the card UID with Arduino? Install MFRC522 library by miguelbalboa. Use the DumpInfo example to read UID and card memory. UID is typically 4 bytes (8 hex characters) for S50 cards.