MFRC522 RFID module connected to ESP8266 (ESP-12) WiFi module
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ESP8266-MFRC522.ino increase serial boud rate to 115200 Jan 14, 2018
LICENSE Initial commit Jun 13, 2015
README.md increase serial boud rate to 115200 Jan 14, 2018

README.md

ESP8266-MFRC522

MFRC522 RFID module connected to ESP8266 (ESP-12) WiFi module

Many thanks to nikxha from the ESP8266 forum (for initial work) and omersiar (for more details of wiring and additional examples)

Requirements

You have to install Arduino IDE 1.6.10 or later. Links are listed below.

  • Arduino > Preferences > "Additional Boards Manager URLs:" and add: http://arduino.esp8266.com/stable/package_esp8266com_index.json
  • Arduino > Tools > Board > Boards Manager > type in ESP8266 and install the board
  • Download MFRC522 library and extract to Arduino library folder or you can use "Library Manager" on the IDE itself to install the MFRC522 library.

Download Links

Simple Example

Wiring RFID RC522 module

The following table shows the typical pin layout used:

Signal MFRC522 WeMos D1 mini NodeMcu Generic
RST/Reset RST D3 [1] D3 [1] GPIO-0 [1]
SPI SS SDA [3] D8 [2] D8 [2] GPIO-15 [2]
SPI MOSI MOSI D7 D7 GPIO-13
SPI MISO MISO D6 D6 GPIO-12
SPI SCK SCK D5 D5 GPIO-14
  • [1] (1, 2) Configurable, typically defined as RST_PIN in sketch/program.
  • [2] (1, 2) Configurable, typically defined as SS_PIN in sketch/program.
  • [3] The SDA pin might be labeled SS on some/older MFRC522 boards

Define RFID module

#include "MFRC522.h"
#define RST_PIN	5 // RST-PIN for RC522 - RFID - SPI - Modul GPIO5 
#define SS_PIN	4 // SDA-PIN for RC522 - RFID - SPI - Modul GPIO4 
MFRC522 mfrc522(SS_PIN, RST_PIN);	// Create MFRC522 instance

Initialize RFID module

void setup() {
  Serial.begin(115200);    // Initialize serial communications
  SPI.begin();	         // Init SPI bus
  mfrc522.PCD_Init();    // Init MFRC522
}

Read RFID tag

void loop() { 
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent()) {
    delay(50);
    return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial()) {
    delay(50);
    return;
  }
  // Show some details of the PICC (that is: the tag/card)
  Serial.print(F("Card UID:"));
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  Serial.println();
}

// Helper routine to dump a byte array as hex values to Serial
void dump_byte_array(byte *buffer, byte bufferSize) {
  for (byte i = 0; i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], HEX);
  }
}

More Examples