RFID-Transponder/RFID-Transponder-Code/README.md

Application Note for RFID Transponder source code Overview

This application demonstrates the integration of an ST25DV NFC/RFID Tag IC, an SD card module, and an Arduino-compatible microcontroller. It provides functionality for reading and writing data to the RFID tag, managing records on an SD card, and testing the system's integrated components such as LEDs and a piezo buzzer. Features

RFID Tag Management:
    Write a record to the ST25DV RFID Tag IC.
    Clear the last RFID entry.
    Detect new records from the RFID tag and log them on the SD card.

SD Card Integration:
    Store and retrieve records from a text file (records.txt).
    Check for duplicate records before saving.
    Clear all records on the SD card.

System Testing:
    Test the onboard piezo buzzer with preprogrammed melodies.
    Test the LED with blink functionality.

Command Interface:
    Interactive commands via Serial Monitor for managing RFID and SD card operations.

Command Reference

$printFile
Prints all records stored on the SD card.

$clearFile
Clears all records in records.txt on the SD card.

$clearRFID
Writes a placeholder (!ignore) to the RFID tag to clear its last entry.

$addRecord <record>
Adds a new record to both the RFID tag and the SD card.

$testBuzzer
Plays a short melody on the piezo buzzer.

$testLED
Blinks the onboard LED to verify functionality.

System Workflow

Setup:
    Initializes the ST25DV RFID Tag IC and the SD card module.
    Displays a splash screen with available commands.

Serial Commands:
    Waits for user input via Serial Monitor.
    Executes the corresponding command and provides feedback through Serial output and the buzzer/LED.

RFID Reading:
    Continuously reads the URI stored on the RFID tag.
    If a new record is detected and is not a duplicate, logs it to the SD card.

Data Logging:
    Uses the SD card to store a persistent record of RFID tag data.
    Ensures duplicate records are not logged to prevent redundancy.