If you want to connect an RFID reader module with Arduino to read RFID tags, this tutorial will help you get started. It’s a common project for learning how RFID works and how to use it with microcontrollers.
What Is RFID?
RFID stands for Radio Frequency Identification. It allows you to identify objects wirelessly by reading small RFID tags that contain unique IDs.
What You’ll Need
- Arduino Uno
- RC522 RFID Reader Module
- RFID tags or cards
- Jumper wires
- Breadboard
- Arduino IDE installed on your computer
How It Works
The Arduino uses the SPI (Serial Peripheral Interface) protocol to communicate with the RFID reader module. When a tag comes close to the reader, the module detects the tag's electromagnetic field and retrieves its unique identification number (UID). The Arduino then reads this UID and displays it on the Serial Monitor, where you can view it in real time.
Arduino RFID RC522 Module Pinout and Pin Configuration
Arduino RFID Wiring: RC522 Circuit Diagram and Connections
To get your Arduino RFID project up and running, you'll need to wire the RC522 module correctly using the SPI interface. Start by connecting the module’s VCC to the Arduino’s 3.3V pin and GND to GND. The RST (Reset) pin goes to pin 9, and the SDA (or SS) pin connects to pin 10. Then connect MOSI, MISO, and SCK from the module to pins 11, 12, and 13 on the Arduino, respectively. While this setup uses pins 9 and 10 for RST and SS, you can actually use other digital pins if needed—just make sure to update your code accordingly. It's a simple wiring setup once you get the hang of it.
Applications
- Access control systems
- Inventory management systems
- Automated attendance tracking Arduino RFID Tutorial: Complete RC522 Guide with Code and Projects
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