# RFID 522 Pinout The RFID 522 pinout is a critical reference for engineers, hobbyists, and developers working with the popular MFRC522 RFID module. Understanding this pin configuration is essential for successful integration into various projects, from access control systems to inventory management tools. ## My Experience with the MFRC522 Module In my personal journey with embedded systems, I've found the MFRC522 to be one of the most versatile and accessible RFID modules available. I recall my first project involving this module—a simple door lock system for my home workshop. The clarity of the RFID 522 pinout made the initial wiring straightforward, though I did encounter some challenges with SPI communication that required careful attention to the pin assignments. This hands-on experience taught me the importance of not just following pinout diagrams blindly but understanding the function of each connection. ## A Natural Aptitude for Hardware Integration I've discovered I have a particular skill for visualizing how different hardware components interconnect. When examining the RFID 522 pinout for the first time, I could immediately see how the module would interface with an Arduino or Raspberry Pi. This ability to mentally map connections has saved me countless hours in prototyping. For instance, recognizing that the IRQ pin could be used for interrupt-driven applications rather than constant polling was an insight that significantly improved the efficiency of my RFID reader projects. ## Technical Specifications and Pin Configuration The MFRC522 module typically features an 8-pin configuration that interfaces with microcontrollers. Below is the detailed RFID 522 pinout: **Module Pinout:** 1. **SDA (Serial Data)**: Digital pin for I2C communication (alternate function) 2. **SCK (Serial Clock)**: Clock signal for SPI communication 3. **MOSI (Master Out Slave In)**: SPI data line from master to module 4. **MISO (Master In Slave Out)**: SPI data line from module to master 5. **IRQ (Interrupt Request)**: Interrupt output pin 6. **GND (Ground)**: Ground connection 7. **RST (Reset)**: Reset pin for the module 8. **3.3V (VCC)**: Power supply (3.3V only - 5V will damage the module) **Technical Para