Freenove RFID-RC522 User Manual (English)

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Sketch

Sketch 1

Before writing the code, we need import the library RFID.zip first.

This sketch will read the unique ID number (UID) of the card, recognize the type of the card and display the

information through serial port.

#include <SPI.h>

#include <RFID.h>

//D10:pin of card reader SDA. D9:pin of card reader RST

RFID rfid(10, 9);

unsigned char status;

unsigned char str[MAX_LEN]; //MAX_LEN is 16: size of the array

void setup()

{

Serial.begin(9600);

SPI.begin();

rfid.init(); //initialization

Serial.println("Please put the card to the induction area...");

}

void loop()

{

//Search card, return card types

if (rfid.findCard(PICC_REQIDL, str) == MI_OK) {

Serial.println("Find the card!");

// Show card type

ShowCardType(str);

//Anti-collision detection, read card serial number

if (rfid.anticoll(str) == MI_OK) {

Serial.print("The card's number is : ");

//Display card serial number

for (int i = 0; i < 4; i++) {

Serial.print(0x0F & (str[i] >> 4), HEX);

Serial.print(0x0F & str[i], HEX);

}

Serial.println("");

}

//card selection (lock card to prevent redundant read, removing the line will make

the sketch read cards continually)

rfid.selectTag(str);

}

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Freenove RFID-RC522 Specifications

General

Chip	MFRC522
Operating Voltage	3.3V
Communication Interface	SPI
Operating Frequency	13.56 MHz
Maximum Data Rate	10 Mbit/s
Dimensions	40mm x 60mm
Compatible Platforms	Arduino, Raspberry Pi
Card Types Supported	MIFARE Ultralight, MIFARE Pro, MIFARE DESFire
Read Range	Up to 3 cm