https://github.com/filiprokita/arduino-nfc

A simple Arduino-based NFC tag reader and writer using the PN532 module. Supports Mifare Classic tags, allowing you to clean, format, and write NDEF records (URLs, text, etc.). Works with iPhone and Android NFC readers.
https://github.com/filiprokita/arduino-nfc

arduino arduino-uno atmega328p i2c iot mifare mifare-classic ndef nfc nfc-reader nfc-tag nfc-writer platformio pn532 rfid smart-card

Last synced: 2 months ago
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A simple Arduino-based NFC tag reader and writer using the PN532 module. Supports Mifare Classic tags, allowing you to clean, format, and write NDEF records (URLs, text, etc.). Works with iPhone and Android NFC readers.

• Host: GitHub
• URL: https://github.com/filiprokita/arduino-nfc
• Owner: FilipRokita
• Created: 2025-03-07T11:14:37.000Z (2 months ago)
• Default Branch: main
• Last Pushed: 2025-03-07T12:21:53.000Z (2 months ago)
• Last Synced: 2025-03-07T12:25:02.957Z (2 months ago)
• Topics: arduino, arduino-uno, atmega328p, i2c, iot, mifare, mifare-classic, ndef, nfc, nfc-reader, nfc-tag, nfc-writer, platformio, pn532, rfid, smart-card
• Language: C++
• Homepage:
• Size: 71.3 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# NFC Tag Reader & Writer using PN532

This project allows you to **read, clean, format, and write data** to **Mifare Classic NFC tags** using the **PN532 module**.  

It works with **Arduino-compatible** devices and uses **I2C** for communication.

## Features

- **Read NFC tags** (Mifare Classic) and display their contents

- **Clean and format NFC tags** for NDEF compatibility

- **Write a URL** (or other NDEF messages) to an NFC tag

- **Works with iPhone & Android** NFC readers

## Requirements

- **Arduino board** (Uno, Mega, etc.)

- **PN532 NFC Module**

- **Mifare Classic NFC Tag**

- **PlatformIO / Arduino IDE**

## Installation

1. Clone this repository:

   ```sh

   git clone https://github.com/FilipRokita/arduino-nfc

   ```

2. Open the project in **PlatformIO** or **Arduino IDE**.

3. Connect your **PN532 module** via **I2C**:

   - `VCC` → `5V`

   - `GND` → `GND`

   - `SDA` → `A4`

   - `SCL` → `A5`

## Usage

### **1️⃣ Writing to NFC Tag**

- Set `writeMode = true;` in the code.

- Upload the sketch to your Arduino.

- Open Serial Monitor (**115200 baud**).

- Place an NFC tag near the reader.

- It will:

  - Clean the tag.

  - Format it.

  - Write a predefined **URL** to the tag.

### **2️⃣ Reading an NFC Tag**

- Set `writeMode = false;`

- Upload and open Serial Monitor.

- Place a tag near the reader.

- The program will display the tag’s **UID**, type, and stored NDEF records.

## Troubleshooting

- **If formatting fails**, the tag may be locked or require a specific authentication key.

- **If reading fails**, check wiring and make sure the tag is supported (**Mifare Classic**).

- **If not working on iPhone**, ensure the tag is formatted for NDEF and contains a valid NDEF record.