SparkFun Qwiic Dynamic NFC/RFID Tag - Read/Write from another tag

Sensors NFC & RFID
1

Hello!

This NFC tag is quite cool and it works great. I’ve tested the EEPROM stuff, I’ve also tested to read and write from/to it with my iPhone. Works geat as well.

Question is, can one SparkFun Qwiic Dynamic NFC/RFID Tag read and write to another SparkFun Qwiic Dynamic NFC/RFID Tag ?

To put this into a scenario. Say we have two devices. Both have the SparkFun Qwiic Dynamic NFC/RFID Tag connected to them. We want device 1 to write to device 2, or read from device 2, and vice versa.

I don’t see an example of that in the library so I thougth I’d as khere. :smiley:

2

Sure, you’d just recombine parts of this https://github.com/sparkfun/SparkFun_ST … ations.ino and alter its code for the other tag

3

Thanks for you reply!

I read that example, but mayne I am completely missing here.

It seems like the example is just for the i2c EEPROM stuff, not for reading tags wirelessly?

I would very much appreciate if you could show me more in depth what part of the code, makes it so that I can read one tag using another tag.

Thanks!

4

There isn’t a ready-made combined example, but you can use the above code with the wifi one https://github.com/sparkfun/SparkFun_ST … F_WiFi.ino to do what you’ve described

5

None of these examples have any functions that enables one tag to read another tag. It’s all just EEPROM or i2c stuff. Reading and writing to a tag over i2c is no problem, works fine. I can also read the tag with my iPhone.

But trying to read one tag using another tag, doesn’t seem to be possible?

In other words. Having 2x ATP boards with a Teensy for example. Each has a NFC tag connected to power and i2c.

Teensy 1 wants to read Teensy 2’s NFC tag. And vice versa.

What function in the library uses one NFC tag to read another?

6

But trying to read one tag using another tag, doesn’t seem to be possible?

Nope. You need a reader to read tags, tags don’t have a reader built into them.

7

Thanks for confirming that, I was starting to loose my mind a little.

So to sum it all up. These IC’s from STM are:

  • EEPROM that can read/write to either via an NFC reader (Smartphone or something) or over i2c.