Using an PN532 RFID reader

What is the difference between an PN532 RFID reader and an MFRC522 RFID reader

RFIDThe meansPN532 radio-frequencyand identification.MFRC522 are two popular RFID usesreader electromagneticmodules, fieldseach with its own features and use cases.

Feature	PN532	MFRC522
Communication	SPI, I2C, UART	SPI only
Supported Protocols	NFC, RFID (13.56 MHz)	RFID (13.56 MHz)
Standards	ISO14443A/B, FeliCa	ISO14443A (MIFARE)
Range	~10 cm	~5 cm
Cost	Higher (~$10–$30)	Lower (~$2–$10)
Power	Higher	Lower
Applications	Advanced, NFC, IoT	Basic RFID projects

Module	Pros	Cons
PN532	Supports NFC and multiple RFID protocols. Versatile communication options: SPI, I2C, UART. Can emulate an NFC tag or work in peer-to-peer mode. Better range (~10 cm).	More expensive (~$10–$30). Higher power consumption. Requires more configuration for advanced features.
MFRC522	Very affordable (~$2–$10). Low power consumption. Simple and easy to transferuse datafor over short distances.basic RFID isprojects. useful Widely available with excellent community support.	Limited to identifyMIFARE people,cards (ISO14443A only). Shorter range (~5 cm). Supports SPI only (no I2C or UART).

In this tutorial, we will be using a PN532 module from DFRobot, if you are using an MFRC522 module, please refer to makethis transactions, etc…tutorial.

YouThis cantutorial useis anadapted from here.

RFID systemTag

to

Aside open a door. For example, onlyfrom the personregular withcard, thethere rightare informationmore onoptions histhan cardbefore, isincluding allowedstickers, to enter. An RFID system usesbutton tags with each identification and a two-way radio transmitter-receiver as a reader.etc.

Wiring

CautionSwitch
You must power this device to 3.3V! This tutorial iswill basedbe using the i2c communication protocol, make sure you switch to IIC on Arduino UNO, if you are using a different module, please check the specific pinout of that model.module.

1. SDAD/T - Digital 10SDA (SS)Pin 14)
2. SCKC/R - Digital 13SCL (SCK)
Pin
3. MOSI - Digital 11 (MOSI)
4. MISO - Digital 12 (MISO)
5. IRQ (unconnected)15)
6. GND - GND (Ground)
7. RST - Digital 9
8. 3.3VVCC to 3.3V5V (Power)

Library

We will be using the MFRC522DFRobot_PN532 library. Please see this tutorial to learn how to install libraries.

Getting started

WeThe number of blocks of data depends on the type of RFID tag or card you’re using. Most commonly, the MIFARE Classic card is used, which is compatible with both the PN532 and MFRC522. A standard MIFARE Classic 1K card will behave using64 blocks of data and the examplesmaller code,NTAG213 DumpInfo,tag will have 36 blocks of data.

Some blocks are read-only, so you cannot write data to those blocks. For example, Block 0 usually contains the UID (Unique Identifier) and other manufacturer data, and is read-only.

The below codes are only for writing to and reading the data from theBlock library3.

to

Write read an RFID Tag.

Data

#include <SPI.h>
#include <MFRC522.DFRobot_PN532.h>

#define  RST_PINBLOCK_SIZE         916
#define  PN532_IRQ          2
#define  INTERRUPT          1
#define  POLLING            0
// Configurable,The seeblock typicalto pinbe layout abovewritten
#define  SS_PINWRITE_BLOCK_NO      103

//DFRobot_PN532_IIC  Configurable,nfc(PN532_IRQ, seePOLLING);

typicaluint8_t pindataWrite[BLOCK_SIZE] layout= above{"your MFRC522 mfrc522(SS_PIN, RST_PIN)message"}; //change Createto MFRC522your instancedata

void setup() {
  Serial.begin(9600)115200);
  // Initialize serial communications with the PCSerial.print("Initializing");
  while (!Serial)nfc.begin()) {
    Serial.print(".");
    // Do nothing if no serial port is openeddelay (added1000);
  }
  Serial.println();
  Serial.println("Waiting for Arduinosa based on ATMEGA32U4)
	SPI.begin();			// Init SPI bus
	mfrc522.PCD_Init();		// Init MFRC522
	delay(4);				// Optional delay. Some board do need more time after init to be ready, see Readme
	mfrc522.PCD_DumpVersionToSerial();	// Show details of PCD - MFRC522 Card Reader details
	Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks.card......"));
}
void loop() {
  // ResetFor S50 card/tag, block 1-2, 4-6, 8-10, 12-14... 56-58, 60-62 are for user data
  // You can read/write these blocks freely.
  // Use "MifareClassic_ReadAllMemory.ino" to check all the loop if no new card is present on the sensor/reader. This saves the entire process when idle.blocks
  if ( ! mfrc522.PICC_IsNewCardPresent(nfc.scan()) {
    return;if (nfc.writeData(WRITE_BLOCK_NO, dataWrite) != 1) {
      Serial.print("Block ");
      Serial.print(WRITE_BLOCK_NO);
      Serial.println(" write failure!");
    }
    //else Select{
      oneSerial.print("Block of");
      theSerial.print(WRITE_BLOCK_NO);
      cardsSerial.println(" ifwrite success!");
      Serial.print("Data written(string):");
      Serial.println((char *)dataWrite);
      Serial.print("Data written(HEX):");
      for (int !i mfrc522.PICC_ReadCardSerial()= 0; i < BLOCK_SIZE; i++) {
        return;Serial.print(dataWrite[i], HEX);
        Serial.print(" ");
      }
    //}
  Dump}
  debug info about the card; PICC_HaltA() is automatically called
	mfrc522.PICC_DumpToSerial(&(mfrc522.uid))delay(500);
}

We

Read willData

#include <DFRobot_PN532.h>

#define BLOCK_SIZE       16
#define  PN532_IRQ        2
#define  INTERRUPT        1
#define  POLLING          0
// The block to be usingread
#define  READ_BLOCK_NO    3

DFRobot_PN532_IIC  nfc(PN532_IRQ, POLLING);
uint8_t dataRead[16] = {0};

void setup() {
  pinMode(13,OUTPUT);
  Serial.begin(115200);
  Serial.print("Initializing");
  while (!nfc.begin()) {
    Serial.print(".");
    delay (1000);
  }
  Serial.println();
  Serial.println("Waiting for a card......");
  
}
void loop() {
  // For S50 card/tag, block 1-2, 4-6, 8-10, 12-14... 56-58, 60-62 are for user data
  // You can read/write these blocks freely.
  // Use "MifareClassic_ReadAllMemory.ino" to check all the exampleblocks
  code,if DumpInfo(nfc.scan()) {
    if (nfc.readData(dataRead, READ_BLOCK_NO) != 1) {
      Serial.print("Block ");
      Serial.print(READ_BLOCK_NO);
      Serial.println(" read failure!");
    }
    else {
      Serial.print("Block ");
      Serial.print(READ_BLOCK_NO);
      Serial.println(" read success!");

      Serial.print("Data read(string):");
      String data = (char *)dataRead;
      Serial.println(data);

/*
      //interaction
      if(data == "your message" ){
        digitalWrite(13, HIGH);
        
        }else{
          digitalWrite(13, LOW);
          }
*/
/*
      //in hex
      Serial.print("Data read(HEX):");
      for (int i = 0; i < BLOCK_SIZE; i++) {
        Serial.print(dataRead[i], fromHEX);
        theSerial.print(" library");
        todataRead[i] read= an0;
      RFID}
      Tag.
Serial.println();
*/
    }
   
    delay(500);
  }
}