RFID module 13.56 MHz Card Reader MFRC522 Reader/Writer
The MFRC522 RFID Reader/Writer Module is a widely used and cost-effective RFID solution that operates at 13.56 MHz frequency. It is designed for contactless communication, enabling seamless identification, authentication, and data exchange with RFID cards and tags. Thanks to its compact size, low power consumption, and compatibility with popular microcontrollers like Arduino, ESP8266, ESP32, Raspberry Pi, and other development boards, this module is perfect for access control, security systems, attendance logging, and smart automation projects.
The MFRC522 chip provides excellent anti-collision performance, allowing it to read multiple tags in close range. Its efficient design makes it a top choice for projects where secure and reliable identification is required.
How It Works
The module communicates with microcontrollers via the SPI interface (also supports I²C and UART in some configurations). When an RFID card or tag enters the detection zone, the module generates a 13.56 MHz electromagnetic field that powers and communicates with the passive card. The card responds with its unique ID, which can then be used for verification, authentication, or data storage. The module can both read and write to compatible MIFARE 1K and 4K cards, making it suitable for a wide variety of applications.
Key Features
Operating Frequency: 13.56 MHz
Based on the NXP MFRC522 IC
Supports SPI (default), I²C, and UART interfaces
Read and write support for MIFARE 1K, 4K cards and compatible tags
Operating Voltage: 3.3V (logic level)
Compact, low-cost, and efficient design
Up to 50 mm detection range (depending on antenna and tag)
Anti-collision detection for multiple tags
Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 3.3 V DC (logic level) |
| Communication | SPI (up to 10 Mbps), I²C, UART |
| Operating Frequency | 13.56 MHz |
| Supported Cards | MIFARE 1K, MIFARE 4K, compatible |
| Maximum Range | Up to 50 mm |
| Module Dimensions | ~40 mm × 60 mm |
Pin Configuration
| Pin | Name | Description |
|---|---|---|
| 1 | SDA | Serial data (chip select in SPI) |
| 2 | SCK | Serial clock (SPI) |
| 3 | MOSI | Master out, slave in (SPI) – |
| 4 | MISO | Master in, slave out (SPI) |
| 5 | IRQ | Interrupt request (optional use) |
| 6 | GND | Ground reference |
| 7 | RST | Reset pin |
| 8 | 3.3V | Power supply input |
Applications
Access control systems (doors, lockers, gates)
Attendance systems for schools and offices
Cashless payment systems using RFID cards
IoT and smart automation projects
Vending machines and ticketing systems
Robotics projects requiring identification
