RC522 RFID Reader/Writer Module 13.56MHz (with Card and Keychain)

Overview

The RC522 RFID Module utilizes the NXP MFRC522 IC to read and write data to compatible RFID tags. Operating at 13.56MHz, it uses the principle of electromagnetic induction to communicate with passive tags (like the included card and keychain) without needing internal batteries in the tags themselves.

This module is a staple for security and automation projects. Because it uses the standard SPI protocol, it is incredibly fast and enjoys massive community support, including readily available libraries for the Arduino IDE.

Technical Specifications

Pinout Configuration

The module features an 8-pin interface for easy breadboarding:

1. VCC: 3.3V Power Supply
2. RST: Reset / Power-down pin
3. GND: Ground
4. IRQ: Interrupt Request pin (Can wake up microcontrollers when a card is detected)
5. MISO: Master In Slave Out (SPI Data to Microcontroller)
6. MOSI: Master Out Slave In (SPI Data from Microcontroller)
7. SCK: Serial Clock (SPI Clock)
8. SDA / SS: Slave Select (SPI Chip Select)

⚠️ Important Voltage Warning: The VCC pin must be connected to 3.3V. Connecting it to 5V will permanently damage the MFRC522 chip. However, the communication pins (SPI) are generally 5V tolerant, so you can connect them directly to a 5V Arduino board.

What's in the Box?

• 1x RC522 RFID Reader/Writer Module
• 1x MIFARE Classic 1K Blank Card
• 1x MIFARE Classic 1K Keychain Tag (Blue)
• 1x Straight Header Pin Strip
• 1x Right-Angle Header Pin Strip

Popular Project Ideas

1. Smart Door Lock: Combine this module with an ESP32 and a Relay to unlock a door when an authorized card is tapped.
2. Attendance System: Log employee or student arrivals directly to a Google Sheet or your Supabase database using a Wi-Fi-enabled microcontroller.
3. Interactive Puzzle: Use RFID tags placed inside objects to trigger specific actions in a robotics or escape room build.