RC522 Mini RFID 13.56MHz IC Card Reader Writer Module

The RC522 Mini RFID IC Card Reader/Writer Module is a compact and reliable 13.56MHz contactless RFID module based on the MFRC522 chip. It is designed for reading and writing compatible RFID cards and tags in embedded electronics, automation, security, access control, and IoT applications. Its compact size and low power consumption make it suitable for portable devices, prototype boards, and space-constrained projects.

The module communicates with a host microcontroller through the SPI (Serial Peripheral Interface), providing reliable and fast data communication. It can be integrated with popular development platforms such as Arduino, ESP32, ESP8266, Raspberry Pi, and STM32, making it suitable for both beginner and advanced electronics projects.

The RC522 operates at 13.56MHz and supports compatible MIFARE cards and tags, including MIFARE S50, S70, Ultralight, and Pro. It can be used to develop RFID-based access control systems, smart locks, attendance systems, inventory tracking devices, identification systems, and other automated security applications.

Its contactless operation allows cards and tags to be detected without physical connection to the reader. The module is particularly useful for projects that require convenient RFID identification and data exchange in a compact form factor.

Features

• Compact and lightweight RFID reader/writer module
• Based on the MFRC522 RFID chip
• Operating frequency of 13.56MHz
• Supports contactless RFID communication
• Uses SPI interface for microcontroller communication
• Compatible with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other suitable controllers
• Supports compatible MIFARE S50, S70, Ultralight, and Pro cards
• Supports RFID card reading and supported card operations
• Low power consumption
• Suitable for battery-powered applications
• Compact design for space-constrained projects
• Suitable for breadboard and prototype development
• Easy to integrate into embedded electronics projects
• Suitable for RFID access-control applications
• Useful for smart-lock and identification systems
• Suitable for IoT and automation projects
• Ideal for educational and DIY electronics applications

Specifications

Parameter	Specification
Product Type	RFID Reader/Writer Module
Controller IC	MFRC522
Operating Frequency	13.56MHz
Communication Interface	SPI
RFID Technology	Contactless
Supported Cards	MIFARE S50, S70, Ultralight, Pro
Logic Voltage	3.3V
Compatible Platforms	Arduino, ESP32, ESP8266, Raspberry Pi, STM32
Application	RFID Reading, Writing, Access Control & Identification

Design and Construction

The RC522 Mini RFID module features a compact PCB design that integrates the MFRC522 RFID controller and antenna into a small form factor. Its lightweight construction makes it convenient for installation in embedded systems, prototypes, portable devices, and custom electronic enclosures.

The integrated RFID antenna enables the module to communicate wirelessly with compatible 13.56MHz RFID cards and tags. The compact board design helps reduce the space required for RFID functionality in electronic projects.

The module provides convenient interface connections for communication with a host microcontroller. Its SPI interface makes it easy to connect to development boards and embedded controllers that support SPI communication.

The RC522 is designed for 3.3V operation, making it suitable for many modern microcontrollers and development boards. Proper voltage-level compatibility should be maintained when connecting the module to a controller.

RC522 Mini RFID IC Card Reader Writer Module reference image

Working Principle

The RC522 works by generating a 13.56MHz electromagnetic field through its integrated antenna. When a compatible RFID card or tag is placed within the reader’s operating range, the module establishes contactless communication with the RFID device.

The MFRC522 chip handles the RFID communication and exchanges data with the compatible card or tag. The card information is then processed by the connected microcontroller through the SPI interface.

A microcontroller can use the received RFID information to identify a user, verify access permissions, record attendance, track inventory, activate a lock, or perform other programmed actions.

For supported cards, the module can also perform appropriate read and write operations depending on the card type, authentication requirements, memory structure, and software implementation.

The RC522 is a passive RFID interface module and requires a compatible microcontroller and suitable software to process card information and control the connected application.

Applications

• RFID access control systems
• Smart door locks
• Electronic security systems
• Student attendance systems
• Employee attendance systems
• RFID identification systems
• Inventory tracking systems
• Asset tracking applications
• Smart lockers
• RFID authentication systems
• IoT access-control systems
• Automated identification systems
• Arduino RFID projects
• ESP32 RFID projects
• ESP8266 RFID projects
• Raspberry Pi RFID projects
• STM32 RFID projects
• DIY electronics projects
• Educational RFID projects
• Embedded security systems
• Automation projects
• Custom RFID readers
• Smart home projects
• Electronic payment and token-based projects
• RFID-based automation systems

Package Includes

• 1 × RC522 Mini RFID Reader Writer Module

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual product may vary slightly in colour, dimensions, PCB layout, antenna pattern, component arrangement, or appearance depending on the manufacturing batch.

RFID cards, RFID tags, microcontrollers, connecting wires, breadboards, power supplies, enclosures, and other components shown in product images are not included unless specifically mentioned in the package contents.

The RC522 is designed for 13.56MHz RFID applications and is not compatible with common 125KHz RFID cards. Please verify that the RFID card or tag being used is compatible with the module before installation.

The module is intended for 3.3V operation. Avoid applying 5V directly to the module’s power or logic connections unless an appropriate voltage-level conversion arrangement is used. Improper voltage may damage the module.

Compatibility with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other controllers depends on the available SPI interface, software libraries, wiring configuration, and operating voltage.