PN532 NFC RFID Module

Introduction

SunFounder PN532 NFC RFID Module is a highly integrated transmission module for Near Field Communication at 13.56MHz. With the mode switch on board, you can change easily between I2C, SPI, and UART modes. The integrated level shifter provides 3.3V or 5V working voltage for your choice. In addition, it supports RFID reading and writing, and NFC function with Android phone, which makes it quite convenient for wireless connection. This module is equipped with two 3mm mounting holes, of which the small dimension makes it easy for using in your project!
Note: When your wiring is correct (no short circuit), the module may be a little heated, which is just normal for use.

Schematic Diagram

The diagram is shown as below:
PN532 Schematic.pdf

Features

 Supports I2C, SPI and HSU (High Speed UART), easy to switch between these modes.
 Works in the NFC mode and RFID reader/writer mode
 The integrated 3.3V voltage regulator provides 3.3V or 5V working voltage for your choice
 Maximum distance for communication: 3 cm
 Equipped with two 3mm mounting holes, easy to use in your project with its small dimension

Test

Preparations

 Arduino Uno/Mega 2560 board (or compatible SunFounder Uno/Mega 2560)
 Dupont Jumper Wires
 Blank NFC card supporting the ISO14443A
 PC with Arduino software installed
 PN532 NFC Module
Note: Pay attention to avoid short circuits between the module’s power and the ground, such as the VCC and the GND

Procedures

The test is implemented on the Uno board in the Arduino IDE V1.6.12.

Install the library

Adafruit has a complete library for this, so we will just use its code to test the module directly.

Step 1: In IDE, select Sketch->Including Library->Manage Libraries, type in PN532 to search. Then we can see Adafruit PN532 searched out, and click INSTALL at the right side to start the installation.

Step 2: Select File->Examples ->Adafruit PN532->ReadMifare to open the ReadMifare.ino

Test under SPI Mode

Step 1: Slide the switch to SPI mode:

SEL0	SEL1
L	H

Step 2: Connect the module and the Uno board as shown below:

PN532 Module	SunFounder Uno
GND	GND
5V	5V
SCK	2
MOSI	3
NSS	4
MISO	5

Step 3: Select the corresponding board and port, and upload the code to the Uno.
Step 4: Click at the upper right corner to open the serial monitor, and select 115200 baud.

Step 5: Thus, you can see the basic information of the card here

Test under I2C Mode

Step 1: Since the SPI mode is set as default, we need to make some changes to the code before testing under I2C mode. Use "//" to comment out the line56, and activate Line 65 by removing the double slashes (comment mark) as shown below:

Step 2: Slide the switch to I2C mode on the module:

SEL0	SEL1
H	L

Step 3: Connect the PN532 and the Uno/Mega2560 as shown below:

PN532 Module	Uno/Mega2560
GND	GND
5V	5V
SDA	A4/ pin20 Mega2560
SCL	A5 /pin21 Mega2560
RSTO	3
IRQ	2

Step 4: Upload the program to the board, and open the Serial Monitor. Change the baud rate to 115200, then put the blank NFC card on the PN532 NFC Module, and then you can see the data of the card as shown below: (the UID Value varies from different UID settings.)