Technical Report: Software Implementation of NFC Tag Reader System
Introduction
This technical report provides an in-depth analysis of the software implementation of an NFC tag reader system. The system is designed to read NFC tags, parse their content, trigger corresponding actions, and communicate the data over Wi-Fi.
Software Architecture
The software architecture consists of three main code sections, each serving a distinct purpose:
- NFC Tag Reader with MP3 Player Integration
- NFC Tag Data Transmission over Wi-Fi
- NFC Tag Authentication and Data Writing
1. NFC Tag Reader with MP3 Player Integration
This section of the code is responsible for reading NFC tags and triggering actions based on the tag content. It utilizes the following libraries and frameworks:
- Libraries: SoftwareSerial, DFRobotDFPlayerMini, Wire, Adafruit_PN532
- IDE: Arduino IDE
- Code Explanation:
- Initializes the PN532 NFC module and MP3 player.
- Reads NFC tag content and parses hexadecimal data.
- Maps tag content to corresponding audio files for playback.
- Implements error handling for read failures and module initialization.
2. NFC Tag Data Transmission over Wi-Fi
In this section, the system communicates NFC tag data over Wi-Fi to a remote server. The following components are involved:
- Libraries: ETH, WiFi, WiFiMulti, Wire, Adafruit_PN532, HTTPClient
- IDE: Arduino IDE
- Code Explanation:
- Establishes Wi-Fi connection using SSID and password.
- Reads NFC tag content and converts it into a human-readable format.
- Sends HTTP requests with the tag data to a specified server endpoint.
- Implements error handling for Wi-Fi connection failures and HTTP requests.
3. NFC Tag Authentication and Data Writing
This section focuses on authenticating NFC tags and writing data to them. It employs the following tools:
- Libraries: Wire, SPI, Adafruit_PN532
- IDE: Arduino IDE
- Code Explanation:
- Initializes the PN532 NFC module.
- Waits for ISO14443A NFC cards and authenticates them.
- If authentication is successful, writes predefined data to Block 7 of the NFC tag.
- Implements error handling for authentication failures and data writing.
Conclusion
The software implementation of the NFC tag reader system demonstrates effective utilization of libraries, frameworks, and IDEs to achieve seamless interaction with NFC tags, MP3 players, Wi-Fi networks, and external servers. The modular code structure enables easy integration of additional functionalities and ensures robust performance of the system.