MFRC522 RFID RC522 13.56MHz Contactless Smart Card Reader Module

MFRC522 RFID RC522 – 13.56MHz Contactless Smart Card Reader Module

The MFRC522 RFID Module is a highly integrated contactless card reader/writer operating at 13.56MHz. Based on the NXP MFRC522 IC, it communicates via SPI (and optionally I2C/UART) and is compatible with MIFARE Classic, MIFARE Ultralight, and other ISO/IEC 14443A compliant cards and tags.

Key Specifications

• IC: NXP MFRC522
• Operating Frequency: 13.56 MHz
• Interface: SPI (up to 10 Mbps), I2C, UART
• Operating Voltage: 3.3V DC
• Read Range: Up to 5cm (card dependent)
• Supported Cards: MIFARE Classic 1K/4K, MIFARE Ultralight, NTAG
• Connector: 8-pin 2.54mm header
• Includes: RFID card + key fob tag

Compatibility & Use Cases

The MFRC522 module is fully compatible with Arduino, ESP32, NodeMCU, and Raspberry Pi via SPI. Use the MFRC522 Arduino library for quick integration. Common applications include:

• Door access control and electronic lock systems
• Attendance tracking and student ID systems
• Inventory and asset management with RFID tags
• IoT-connected smart locker and safe systems
• STEM and engineering project demonstrations

Comes with one RFID card and one key fob for immediate testing. Note: operates at 3.3V — use a logic level shifter when interfacing with 5V Arduino boards.

Frequently Asked Questions

Are RFID cards included with the module?
Yes. One MIFARE Classic card and one key fob tag are included, so you can test reading and writing as soon as the module arrives.

Can it write data to cards or only read them?
It can do both. You can read a card's unique ID (UID) and also write and read data blocks on MIFARE Classic cards, which is useful for stored-balance or ID projects.

How do I connect it to a 5V Arduino UNO?
Power the module from the Arduino's 3.3V pin and use a logic level shifter (or resistor dividers) on the SPI lines, since the MFRC522 is a 3.3V device and is not 5V tolerant.

What is the typical reading distance?
Up to about 5cm depending on the card or tag. Hold the card flat and centred over the antenna area for the most consistent reads.

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