NFC/RFID Tag Writer

Concept This project unlocks wireless interaction. It uses Near Field Communication (NFC) to write data onto a physical card. It represents the "Internet of Things" (IoT) capability—tagging physical objects with digital information (in this case, a website URL).

The Tech Stack

• Hardware: MFRC522 RFID/NFC Module.
• Logic: SPI Protocol, NDEF (NFC Data Exchange Format) Structuring.
• Libraries: MFRC522, NfcAdapter.
• Objective: Program an NFC tag to open a specific URL when scanned by a phone.

How it Works The system acts as a writer/programmer station.

1. Detection: It constantly polls the electromagnetic field for a passive tag.
2. Formatting: If a tag is found, it attempts to format it to the NDEF standard (making it readable by smartphones).
3. Writing: It constructs a URI record ("https://www.gjgalante.com") and burns it into the tag's memory blocks via the SPI bus.

AI Context 🤖 AI navigated the dependency complexity, suggesting the correct combination of libraries (MFRC522 for low-level hardware and NfcAdapter for high-level NDEF formatting) and adding the antenna gain boost to ensure reliable writes.

Status ✅ Operational | Successfully writing URLs to tags.