RC522 RFID Reader

Background

The RC522 is an RFID (Radio Frequency Identification) reader that allows you to authenticate users with your project. The module also comes with an RFID card and a key fob. The reader uses high frequency electromagnetic fields to read the RFID card which has an antenna inside.

 

Hardware Description

Pinout - Can use SPI or I2C interface for communication

• SDA - SPI Chip Select (CS/SS) Pin, also I2C Data Pin - connect to digital pin 10
• SCK - SPI Clock pin, also I2C Clock Pin - connect to digital pin 13
• MOSI - SPI Master Out Slave In Data (Data from Arduino) - connect to digital pin 11
• MISO - SPI Master In Slave Out Data (Data to Arduino) - connect to digital pin 12
• IRQ - Interrupt Pin - not connected
• GND - Ground Pin
• RST - Reset Pin - not connected
• 3.3V - VCC must use 3.3V! 5V will damage the module.

 

Software Description

For the software, we will use the MFRC522v2 library: https://github.com/OSSLibraries/Arduino_MFRC522v2.

See the following example for more info on how to use the library: https://create.arduino.cc/editor/mjdargen_ncsu/9b74d05c-dcc4-48c6-9a53-f04720ceb2b9/preview

 

Resources

• MFRC522v2 Library Documentation: https://github.com/OSSLibraries/Arduino_MFRC522v2
• Example Project Using RFID: https://www.instructables.com/Arduino-RC522-RFID-Door-Unlock/