PN532 RFID NFC Module

The PN532 RFID/NFC module enables an Arduino/ESP32 to communicate with NFC tags and contactless cards. It typically supports multiple digital interfaces, commonly SPI (using SS, MOSI, MISO, SCK) and I2C (using SCL, SDA), along with power (VCC/GND) and control/interrupt signals (RSTO/IRQ).

Width: 46.2 mm

Pinout — PN532 RFID NFC Module

Pin	Signal	Description
`RSTO`	reset	PN532 reset line for resetting the NFC controller.
`IRQ`	interrupt	Interrupt request output from the PN532 to signal events to the host.
`GND`	ground	Ground reference for the PN532 module and host interface.
`VCC`	power	Main power input for the PN532 module.
`SS`	chip-select	SPI slave-select input for enabling PN532 SPI communication.
`MOSI`	MOSI	SPI data input from the host MCU to the PN532.
`MISO`	MISO	SPI data output from the PN532 to the host MCU.
`SCK`	SCK	SPI clock input from the host MCU for PN532 SPI mode.
`SCL`	SCL	I2C clock line for PN532 communication.
`SDA`	SDA	I2C data line for PN532 communication.
`VCC.1`	power	Power input for the I2C-side header of the PN532 module.
`GND.1`	ground	Ground reference for the I2C-side header.

Example wiring diagram — PN532 RFID NFC Module

From	To	Wire
`board:5V`	`x1:VCC.1`	red
`board:GND`	`x1:GND.1`	black
`board:A4`	`x1:SDA`	green
`board:A5`	`x1:SCL`	blue
`board:D2`	`x1:IRQ`	yellow
`board:D3`	`x1:RSTO`	purple

Example Arduino code — PN532 RFID NFC Module

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

#include <Wire.h>
#include <Adafruit_PN532.h>

// Arduino Uno pins used by this example:
// IRQ  -> D2
// RSTO -> D3
Adafruit_PN532 nfc(2, 3);

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    ;
  }

  Serial.println("PN532 NFC reader starting...");

  nfc.begin();

  uint32_t versiondata = nfc.getFirmwareVersion();
  if (!versiondata) {
    Serial.println("Didn't find PN532 board");
    while (1) {
      delay(10);
    }
  }

  Serial.print("Found PN532 chip, firmware version: ");
  Serial.print((versiondata >> 24) & 0xFF, HEX);
  Serial.print('.');
  Serial.println((versiondata >> 16) & 0xFF, HEX);

  nfc.SAMConfig();
  Serial.println("Waiting for an ISO14443A card/tag...");
}

void loop() {
  uint8_t uid[7];
  uint8_t uidLength;

  bool success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength, 1000);
  if (success) {
    Serial.print("Found tag UID: ");
    for (uint8_t i = 0; i < uidLength; i++) {
      if (uid[i] < 0x10) Serial.print('0');
      Serial.print(uid[i], HEX);
      if (i < uidLength - 1) Serial.print(':');
    }
    Serial.println();
    delay(1000);
  }
}

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