RC522 Problem with reading Some Mifare 1k cards & tags

[Soheil CE]

Hi, I have a RC522 module and usually work fine and read mifare 1k cards, but some cards after a while not reading by module and have no reaction, so i try pn532 module and those cards work as well as first time with RC522 module .
Do you have any ideas why this problem happend to RC522 module ?
Thanks for your help

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[TapLinx Support]

Hi Soheil,

I do not believe that the problem is the RC522 module. Do you sure, all MIFARE Classic cards are genuine NXP cards?

All NXP products must fulfil strong specifications to guarantee proper use. This allows the usage also in bad conditions: reader antenna field is limited or not proper balanced etc. It exists non-NXP products were the specifications are in a “border area”. The reader tries to communicate with this card. This might work sometimes, sometime not.

The TapLinx team

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