RFID,NFC Module(PN532)

This is an NFC module that allows communication mode selection among UART, I2C, and SPI through two built-in switches.

In this document, we proceed with the I2C method. For those interested in other methods, please refer to the PN532 guide.

Specifications

• Operating Voltage: 5V
• Interface: UART, I2C, SPI
• Operating Distance: up to 5cm ~ 7cm

Hardware

• Arduino
• PN532
• Jumper cables

Connection

Arudino UNO	PN532
5V	VCC
GND	GND
A4	SDA
A5	SCL

Libraries

• Wire
• PN532_I2C
• PN532
• NfcAdapter

Example Code

// for I2C Communication (SDA(A4), SCL(A5))
#include <Wire.h>
#include <PN532_I2C.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);
String tagId = "None";
byte nuidPICC[4];

void setup(void) {
  Serial.begin(9600);
  Serial.println("Serial start");
  nfc.begin();
}

void loop() {
  readNFC();
}

void readNFC() {
  if (nfc.tagPresent()) {
    Serial.println("============================================");
    NfcTag tag = nfc.read();
    tag.print();
    tagId = tag.getUidString();
  }
  delay(1000);
}

Execution Result