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Sep 12, 2015 at 4:29 comment added David Cary Sam, it sounds like you're asking two different questions: "How do I put the MFRC522 into sleep mode?" and "How do I send commands, such as the soft power-down command, from an Arduino to the MFRC522?". I suggest you open a separate, independent question to ask that second question, as recommended by meta.stackexchange.com/questions/39223/… .
Apr 15, 2015 at 15:09 comment added Gerben Two questions, one answer. I'm done helping you.
Apr 15, 2015 at 1:27 comment added Sam W I didn't know there was anything other than an SPI library for it; but currently using SPI.
Apr 14, 2015 at 20:04 comment added Gerben First, that wasn't your question. Secondly, you didn't say how you connected it. Are you using SPI or UART? What library are you using?
Apr 14, 2015 at 19:03 comment added Sam W I still don't get how to implement this in my arduino code.
Apr 13, 2015 at 16:28 history answered Gerben CC BY-SA 3.0