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That's really cool!

It would be interesting to see it be more commercially-viable. It probably wouldn't really work with NFC (but I'd love to be wrong).

It would also be great for spy movies.

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With the STEMMA QT port you can attach something like this $4 RFID breakout[1] and have a badge that people can scan at a conference to get your details. No soldering needed, you can connect it directly to the board with a $1 cable and it's probably easy to program with MicroPython, although I'm not sure how extensible their "Badge OS" is.

edit: there's no MicroPython library for it apparently, but the datasheet[2] is pretty detailed. I've written Python libraries from such protocol definitions before, it's not too difficult.

[1] https://www.adafruit.com/product/4701

[2] https://www.st.com/resource/en/datasheet/st25dv04k.pdf

Why wouldn't it work with NFC? NFC doesn't require onboard power, the reader powers it.

I think that they don't have it set up for NFC.

If they did, the chip could be programmed, along with the badge face.

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