ESP32 - RFID/NFC
This tutorial instructs you how to use ESP32 withRC522 RFID/NFC reader to read the information from RFID/NFC tag.
Hardware Used In This Tutorial
|1||×||ESP-WROOM-32 Dev Module|
|1||×||USB Cable Type-C|
|1||×||RFID/NFC RC522 Kit (reader + tags)|
|1||×||RFID Key Fob|
|1||×||(Optional) DC Power Jack|
|1||×||(Recommended) ESP32 Screw Terminal Adapter|
Or you can buy the following sensor kit:
|1||×||DIYables Sensor Kit 30 types, 69 units|
Introduction to RFID-RC522 Module
The RFID-RC522 module has 8 pins, some pins are shared among three communication interfaces: SPI, I2C, UART. At a time, only one communication mode can be used. The pin are:
- GND pin: connect this pin to GND (0V)
- VCC pin: connect this pin to VCC (3.3)
- RST pin: is a pin for reset and power-down. When this pin goes low, hard power-down is enabled. On the rising edge, the module is reset.
- IRQ pin: is an interrupt pin that can alert the ESP32 when RFID tag comes into its detection range.
- MISO/SCL/TX pin: works as:
- MISO pin if SPI interface is enabled
- SCL pin if I2C interface is enabled
- TX pin if UART interface is enabled.
- MOSI pin: works as MOSI if SPI interface is enabled.
- SCK pin: works as SCK if SPI interface is enabled
- SS/SDA/RX pin: works as:
- SS pin if SPI interface is enabled
- SDA pin when I2C interface is enabled
- RX pin when UART interface is enabled.
- The pins order can vary according to manufacturers. ALWAYS use the labels printed on the module. The above image shows the pinout of the modules from DIYables manufacturer.
- The RFID-RC522 module works with 3.3V. Do not connect the RFID-RC522 module's VCC pin to 5V. 5V can burn the RFID-RC522 module.
- This tutorial uses SPI interface for communication between ESP32 and RFID-RC522 module.
※ NOTE THAT:
This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
The wiring table between RFID/NFC RC522 Module and ESP32
|RFID/NFC RC522 Module||ESP32|
|SS pin||→ (29) GPIO5|
|SCK pin||→ (30) GPIO18|
|MOSI pin||→ (37) GPIO23|
|MISO pin||→ (31) GPIO19|
|IRQ pin(not connected)|
|GND pin||→ GND|
|RST pin||→ (11) GPIO27|
|VCC pin||→ 3.3V|
ESP32 RFID/NFC Code
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- On Arduino IDE, Navigate to Tools Manage Libraries
- Type “MFRC522” on the search box, then look for the library by GithubCommunity
- Install the library by clicking on Install button.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Open Serial Monitor on Arduino IDE
- Tap several RFID/NFC tags on RFID-RC522 module
- See the UID printed on Serial Monitor
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