Arduino Nano ESP32 - RFID
This tutorial provides instructions on how to use Arduino Nano ESP32 with RC522 RFID/NFC reader to read the information from RFID/NFC tag.
Hardware Preparation
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables.
Additionally, some of these links are for products from our own brand, DIYables.
Overview of RFID-RC522 Module
Pinout
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 Arduino Nano 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 Arduino Nano ESP32 and RFID-RC522 module.
※ NOTE THAT:
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
The wiring table between RFID/NFC RC522 Module and Arduino Nano ESP32
| RFID/NFC RC522 | Arduino Nano ESP32 |
|---|---|
| SS | → D10 |
| SCK | → D13 |
| MOSI | → D11 |
| MISO | → D12 |
| IRQ | not connected |
| GND | → GND |
| RST | → D5 |
| VCC | → 3.3V |
Arduino Nano ESP32 RFID/NFC Code
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-rfid
*/
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN D10 // Arduino Nano ESP32 pin connected to RC522's SS pin
#define RST_PIN D5 // Arduino Nano ESP32 pin connected to RC522's RST pin
MFRC522 rfid(SS_PIN, RST_PIN);
void setup() {
Serial.begin(9600);
SPI.begin(); // init SPI bus
rfid.PCD_Init(); // init MFRC522
Serial.println("Tap an RFID/NFC tag on the RFID-RC522 reader");
}
void loop() {
if (rfid.PICC_IsNewCardPresent()) { // new tag is available
if (rfid.PICC_ReadCardSerial()) { // NUID has been readed
MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
Serial.print("RFID/NFC Tag Type: ");
Serial.println(rfid.PICC_GetTypeName(piccType));
// print UID in Serial Monitor in the hex format
Serial.print("UID:");
for (int i = 0; i < rfid.uid.size; i++) {
Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
Serial.print(rfid.uid.uidByte[i], HEX);
}
Serial.println();
rfid.PICC_HaltA(); // halt PICC
rfid.PCD_StopCrypto1(); // stop encryption on PCD
}
}
}
Detailed Instructions
- If this is the first time you use Arduino Nano ESP32, see how to setup environment for Arduino Nano ESP32 on Arduino IDE.
- Open the Library Manager by clicking on the Library Manager icon on the left navigation bar of Arduino IDE
- 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 Arduino Nano 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
COM6
Tap an RFID/NFC tag on the RFID-RC522 reader
RFID/NFC tag Type: MIFARE 1KB
UID: 2B B8 59 B1
RFID/NFC tag Type: MIFARE Ultralight or Ultralight C
UID: 15 75 46 7A 2C 5B 7E
Autoscroll
Clear output
9600 baud
Newline