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RFID-Transponder-Code/README.md

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+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.