PN532 with STM32

Projects
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I’ve recently been messing around with the STM32 - BlackPill microcontroller, and found that the pinout exactly matches that of the PN532 NFC module. Allowing them to be soldered directly toegether into a small form factor rfid scanner (with USB type-C!).

I first soldered header pins to the NFC module, then pried off the plastic spacer.
Next I put down a strip of Kapton tape to insulate the two boards.
Lastly, I placed the STM32 hard up against the NFC module and soldered it into place, before trimming the excess length off of the header pins.

The code is based on this library by elechouse.
Using the example code as a starting point, the protocol is set to I2C.
Then the following two lines are added to the beginning of void setup():
Wire.setSDA(PB9);
Wire.setSCL(PB8);

And thats it!
The code is flashed to the STM32 and voilà!

PXL_20210329_124840034
PXL_20210329_1248400343024×4032 4.79 MB

More pictures!

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PXL_20210329_1248469663024×4032 4.28 MB

PXL_20210329_124903873
PXL_20210329_1249038733024×4032 2.84 MB

PXL_20210329_124807477
PXL_20210329_1248074773024×4032 3.39 MB

I also painted over the led on the NFC module with black nail polish as its very bright otherwise. At this time I don’t know if it can be remove altogether withought causing other issues.

5 Likes
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Wonder how much having the PCB in the field affects tuning. It works so I guess not much.

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I also wonder that, so far I haven’t found it to be an issue though.

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Ha that’s great I think @Vicarious did one with a pro micro and @Chimpofm did an weird one not sure what it was :laughing:

Would be cool to have them all documented in one thread.

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Yep, originally I made this:
https://www.dangerousminds.io/2016/10/24/hello-world/

Now I made these:

image
image4032×3024 3.07 MB

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Chimpo did this! Rc522 and a micro

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received_842776062886954666×1280 36.3 KB

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may i have your full code?

nice work!

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Sure thing!
At the moment is literally just the iso14443a_uid sketch with the above changes, nothing too exciting haha

PN532_STM32.zip (1.4 KB)

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awesome, thanks for that -
i’m gonna be messing with this sucker
https://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=90_93&products_id=2271&zenid=1ticpf2ii7dra9ab1ef33v1he1
external antenna which i have cutoff the circuit board (was held on with a shrink tubey thing) and the pn532 is itty bitty, smaller than the st :smiley: will post results when done

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That’s cool!
I look forward to reading your write up :smile:

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Oooo…disregard if annoying, but is there any way I could beg, borrow or buy one of these off of you? I have made a few LED necklaces based on this rad battery holder design, and I really want to try to make a necklace antennae for just lighting up my xSIID LED.

I could make something like this on my own, but yours are gorgeous and I’d love a collab.

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Hey old friend!

received_1146184412771886

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Nowadays when I make them, they are assembled in a 3D printed case, I named them “Unloki” and are sold on the Digiwell webshop:

image

Instructions are on https://www.v.icario.us/unloki/

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Thank you!