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Demonstration
NFC/RFID Tag at a glance
Before going into the design and source code. I briefly describe about memory of NFC/RFID tag.
Memory of NFC/RFID tag usually includes at least two memory types:
- A memory portion to store the unique tag ID number by the manufacturer when the IC is manufactured. Typically, this memory portion cannot be changed.
- User memory to store user data. This memory can be readable/writable, write-only, read-only, or write-once... It may contain information to restrict access such as secret key or access conditions. The secret key may be write-only and changeable. It is required to access memory. The access condition bits specify read/write possibility for a part of or whole memory. You can use these bits to lock memory.
Things Used In This Project
- PHPoC Blue or Black
- PN532 NFC/RFID controller (in my case, I used Adafruit PN532 RFID/NFC Breakout)
- Some NFC/RFID tag (Mifare Classic tag)
- PHPoC bread board (Optional)
- Jumper wires
Wiring Diagram between PHPoC and Adafruit PN532
- PHPoC------------- Adafruit PN532
- 3V----------------3.3V (Red wire)
- SCK ----------------SCK (Yellow wire)
- MISO---------------MISO (Green wire)
- MOSI---------------MOSI (Blue wire)
- 4 ------------------SSEL (White wire)
- GND---------------GND (Gray wire)
Source Code
The image bellow shows the source code architecture. For other tag types and another NFC/RFID controllers, I hope that someone who is interested in this project can implement it and share it in this forum.
My code is reusable, including:
- PN532 library
- Mifare Classic Tag library
- Examples:
- read UID
- read data
- write data
- change secret key.
- Combine three first examples (as shown on demonstration video)
You can get the full source codes: PHPoC_NFC_RFID_Source_Code.zip
If you have any questions or something to discuss, leave a comment below.