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I have an RFID-RC522 module that I recently purchased from a hobby store, it came with a key fob and a card. I was experimenting with it last night and was working just fine using Raspberry Pi Pico, but all over sudden, the card is not getting detected by the module. I thought I had a problem with my code, but then even after switching to Arduino Uno the card is not being read or detected, but the key fob is working fine. I am using the examples from the famous MFRC522 Library by GitHub Community available in the Arduino Library manager to do the tests. Could my card be destroyed or what? Is there a way to fix it? I have seen some people with the problems with the code and connections but mine the key fob is working so I think it's the card issue.

Georgey
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  • Which Chip do you have? For DESFire there is a security lock which shuts the chip down on suspicious behavior but should come back after 30min. – Felix Arnold Oct 25 '22 at 08:10
  • It is the one that comes with the RC522 module, together with a key fob. I don't really know it's specifications. Is there a way to check these details? – Georgey Oct 27 '22 at 12:31

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