Arduino Apple Pay Octopus Card Reader

^ Click this photo to view the demo video.

Introduction

Read the Card ID and Balance on apple pay Octopus Card.

Supported Hardware

PN532 NFC chip

Arduino Mega 2560

Tested on Octopus Card.

Tested on Smart Octopus on iPhone X and Apple watch series 5.

Installation

Install PN532 NFC Arduino Library

Download the Seeed-Studio PN532 NFC Library.

Put all of the necessary files to one Folder and put this folder to Arduino library directory.

# Necessary files: 
PN532.cpp
PN532.h
PN532Interface.h
PN532_HSU.cpp
PN532_HSU.h
PN532_I2C.cpp
PN532_I2C.h
PN532_SPI.cpp
PN532_SPI.h
PN532_SWHSU.cpp
PN532_SWHSU.h
PN532_debug.h

Arduino i2c Library Modification

To read the octopus card balance value correctly, you need to modify the Arduino I2C buffer from 32 to 64 in Wire.h and twi.h

# File: ${Arduino}/Java/hardware/arduino/avr/libraries/Wire/src/Wire.h
28c28
< #define BUFFER_LENGTH 32
---
> #define BUFFER_LENGTH 64

# File: ${Arduino}/Java/hardware/arduino/avr/libraries/Wire/src/utility/twi.h
32c32
<   #define TWI_BUFFER_LENGTH 32
---
>   #define TWI_BUFFER_LENGTH 64

[Optional] Install Display driver

Install the optional display driver from Arduino Library Manager

LCD1602 / LCD2004 driver

Install LiquidCrystal_I2C

SSD1306

Install Adafruit_SSD1306 library

Usage

Flash the program to any Arduino Board. i2c connection is recommended.

Implementation

You need to follow the Felica reading procedure to establish a correct Apple Pay Octopus Card reading.

Step:

1. Polling the card
2. Request card service
3. Read without encryption
4. Release the FeliCa card

Step 1 - Polling the card

You need to use systemCode=0x8008 to trigger Apple Pay Express Transit Mode.

RequestCode can be either 0x00 or 0x01.

0x00 = Request Nothing.

0x02 = Request felica system code

0x03 = Request Felica Performance Index .

# Code Reference
nfc.felica_Polling(systemCode, requestCode, ...);

Step 2 - Request card service

You need to use serviceCode=0x0117 to get the balance value.

If this function call is omitted, the apple pay system cannot show the complete signal until timeout. But the card data can still be obtained.

# Code Reference
nfc.felica_RequestService(..., serviceCodeList, ...)

Step 3 - Read without encryption

Similar to Step 2, use serviceCode=0x0117 and blockID=0x8000 to read the Octopus Card Balance.

You need to deduce the card reading by 350 / 500 to obtain the correct balance value.

# Code Reference
nfc.felica_ReadWithoutEncryption(..., serviceCodeList, ..., blockList, ...)

Step 4 - Release the FeliCa card

Release the Card after the reading procedure.

# Code Reference
nfc.felica_Release()

Disclaimer

Using this software and hardware design improperly may damage your phone and Octopus Card. You follow the steps at your own risk. I am not to be held liable for your belongings.

Photo

Reference

https://github.com/Seeed-Studio/PN532 https://github.com/metrodroid/metrodroid/wiki/Octopus https://blog.kalan.dev/core-nfc-en/ https://github.com/kk-lai/octopus_reader