Example Code for Arduino-Read Basic Info of NFC Card

Hardware Preparation

• DFRduino UNO R3 or DFRobot Mega 2560 V3.0 x 1
• Gravity: UART & I2C NFC Module x 1
• Gravity 4P sensor wire (or Dupont wires) x 1
• USB to TTL Converter x 1

Software Preparation

• Arduino IDE
• DFRobot_PN532 library

Wiring Diagram

• I2C interface: turn the switch to the left. I2C interface is mainly used for communication with various 3.3V/5V controllers by programming.
  

Other Preparation Work

1. According to the first connection diagram, connect UNO to the NFC module through IIC, and turn the switch to IIC.
2. Download and install the DFRobot_PN532 library.

Sample Code

/*!
    @flie NFC_cardinfo.ino
    @Copyright   [DFRobot](https://www.dfrobot.com), 2016
    @Copyright   GNU Lesser General Public License
    @version  V1.0
    @date  07/03/2019

    @brief This demo runs on the arduino platform.
           Download this demo to read the basic information of the card,
           including UID, manufacturer, storage space, RF technology etc.
           
           Suported NFC card/tag:
           1.MIFARE Classic S50/S70
           2.NTAG213/215/216
           3.MIFARE Ultralight

    This demo and related libraries are for DFRobot Gravity: I2C&UART NFC Module
    Product(CH): https://www.dfrobot.com.cn/goods-2029.html
    Product(EN): https://www.dfrobot.com/product-1905.html
*/
#include <DFRobot_PN532.h>

#define  BLOCK_SIZE      16
#define  PN532_IRQ      (2)
#define  INTERRUPT      (1)
#define  POLLING        (0)
// Use this line for a breakout or shield with an I2C connection
// Check the card by polling
DFRobot_PN532_IIC  nfc(PN532_IRQ, POLLING); 
struct card NFCcard;

void setup() {

  Serial.begin(115200);
  //Initialize the NFC module
  while (!nfc.begin()) {
    Serial.println("initial failure");
    delay (1000);
  }        
  Serial.println("Please place the NFC card/tag on module..... ");
}

void loop() {
  //Scan, write and read NFC card every 2s
  //Print all what is to be written and read
  
  if (nfc.scan()) {
    //Read the basic information of the card
    NFCcard = nfc.getInformation();
    Serial.println("----------------NFC card/tag information-------------------");
    Serial.print("UID Lenght: "); Serial.println(NFCcard.uidlenght);
    Serial.print("UID: ");
    for (int i = 0; i < NFCcard.uidlenght; i++) {
      Serial.print(NFCcard.uid[i], HEX);
      Serial.print(" ");
    }
    Serial.println("");
    Serial.print("AQTA: "); Serial.print("0x"); Serial.print("0"); Serial.print(NFCcard.AQTA[0], HEX); Serial.print(""); Serial.println(NFCcard.AQTA[1], HEX);
    Serial.print("SAK: "); Serial.print("0x"); Serial.println(NFCcard.SAK, HEX);
    Serial.print("Type: "); Serial.println(NFCcard.cardType);
    Serial.print("Manufacturer:"); Serial.println(NFCcard.Manufacturer);
    Serial.print("RF Technology:"); Serial.println(NFCcard.RFTechnology);
    Serial.print("Memory Size:"); Serial.print(NFCcard.size); Serial.print(" bytes(total)/"); Serial.print(NFCcard.usersize); Serial.println(" bytes(available)");
    Serial.print("Block/Page Size:"); Serial.print(NFCcard.blockSize); Serial.println(" bytes");
    //Serial.print("Sector Size:"); Serial.print(NFCcard.sectorSize); Serial.println(" bytes");
    Serial.print("Number of Blocks/pages:"); Serial.println(NFCcard.blockNumber);
  }
  else {
    //Serial.println("no card!");
  }
  delay(2000);
}

Result

Basic info such as the size and protocol of the NFC card is displayed. Currently supported NFC cards/tags include: MIFARE Classic S50/S70, MIFARE Ultralight, NTAG213/215/216.