Hello , I am using RC522 module and using library MFRC522 when I tried to read any card except the card with the module can't detect these cards , just detecting the cards with the module so what is the problem in this case .and how to control the card access with time limit and date . Thanks,

Problem in reading cards using MFRC522

eng_ibrahim_comm2012 May 23, 2018, 11:45pm 3

Hello Paul ,

I don't know what is the operating frequency of the other cards , can you please told me how to detect the card frequency ?

thanks,

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