RFID Module PN532 NFC – 13.56MHz

PN532 NFC / RFID Module – 13.56MHz (I2C, SPI, UART)

Overview:

The PN532 NFC / RFID Module is a powerful and flexible 13.56MHz contactless communication module based on the NXP PN532 chip, one of the most popular NFC controllers in the market. It supports NFC, RFID reader/writer, card emulation, and peer-to-peer communication.

With support for SPI, I2C, and UART, it is easy to interface with Arduino, ESP32, Raspberry Pi, and other microcontrollers. It can read a wide range of tags including Mifare Classic 1K, NTAG203/213, and other ISO14443 Type A/B cards.

Key Features:

• Based on NXP PN532 NFC controller

• Supports NFC (P2P), RFID tag reading, and card emulation

• Compatible with ISO/IEC 14443 Type A & B cards

• Operates at 13.56MHz frequency

• Multiple interface options: I2C, SPI, UART

• Built-in antenna coil, no external antenna required

• Reading distance: up to 5cm (depends on tag and power)

• Arduino and Python libraries available

• Comes with level shifting circuit for 3.3V & 5V compatibility

Technical Specifications:

Wiring (Arduino Uno – I2C Mode):

💡 Slide the onboard switch to I2C mode before use.

Sample Arduino Code (I2C + NFC Card Reader):

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

#define SDA_PIN  A4
#define SCL_PIN  A5
Adafruit_PN532 nfc(SDA_PIN, SCL_PIN);

void setup(void) {
  Serial.begin(9600);
  nfc.begin();
  uint32_t versiondata = nfc.getFirmwareVersion();
  if (!versiondata) {
    Serial.println("Didn't find PN532");
    while (1);
  }
  nfc.SAMConfig();
  Serial.println("Waiting for an NFC card...");
}

void loop(void) {
  uint8_t success;
  uint8_t uid[7];
  uint8_t uidLength;
  
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
  if (success) {
    Serial.print("UID: ");
    for (uint8_t i = 0; i < uidLength; i++) {
      Serial.print(uid[i], HEX);
      Serial.print(" ");
    }
    Serial.println();
    delay(1000);
  }
}

✅ How to Install the Library in Arduino IDE:

🔹 Option 1: Via Library Manager

1. Open Arduino IDE

2. Go to Sketch > Include Library > Manage Libraries…

3. Search for: PN532 or Adafruit PN532

4. Install "Adafruit PN532 by Adafruit"

🔹 Option 2: Manual GitHub Installation

🔗 https://github.com/adafruit/Adafruit-PN532

Applications:

• Contactless RFID/NFC authentication

• Secure access control systems

• Smart vending or payment simulation

• Arduino + NFC business card reader

• NFC tag-based IoT triggers

• Peer-to-peer NFC communication (Android ↔ Arduino)

Resources:

• 📄 Datasheet PDF (PN532 Chip):
  https://www.nxp.com/docs/en/user-guide/141520.pdf

• 🧰 Arduino Library (Adafruit PN532):
  https://github.com/adafruit/Adafruit-PN532

• 📘 Written Tutorial (Adafruit Guide):
  https://learn.adafruit.com/adafruit-pn532-rfid-nfc

• 🎥 YouTube Tutorial – PN532 with Arduino (by How To Mechatronics):
  https://youtu.be/PXE8nsXh4eg