MFRC522 - Problem reading Tag about periph HOT 3 CLOSED

I changed the power supply and it worked, sorry for opening an issue.

from periph.

Wow thanks for the detailed report.

Two requests:

• I'd recommend to switch to v3, as improvements are only done there now. See https://periph.io/news/2020/a_new_start/
• Would you mind submit a PR to add documentation under https://periph.io/device/ for the mfrc522 as it seems to be a popular device and you could add a note on how to diagnose when there's insufficient power? It's a matter of adding a new file under https://github.com/periph/website/tree/master/site/content/device and an image under https://github.com/periph/website/tree/master/site/static/img.

from periph.

Thanks for the hint, I changed to v3.

I also added documentation as far as my knowledge goes.
Tried to upload a picture as well, but get message "Uploads are disabled. File uploads require push access to this repository."

To be honest, I do not know if it really was the power supply, just read somewhere on the web, that some hardware can be sensitive. So it was just a guess, I changed it and it worked. So I have no way for diagnose.
But still, I added a hint in the documentation.

from periph.