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Topic: Wiring the RFID-RC522 RFID Reader (Read 71 times) previous topic - next topic


I am about to hook up the above board, available everywhere on the internet, to create a remote entry system.  I see many examples of the wiring, but I have two questions.

1.  Since I am hooking it to a 5 v. Nano, I need to worry about voltage levels.  Any line that is one-way from the Nano to the reader should suffice with a voltage divider.  So it appears that I only need a full level shifter for the MISO line.  Is that correct?

2.  I have not found any information on what the IRQ is for.  Is that an interrupt from the reader, or to the reader, and when would it be used?

Thanks in advance for any information.


MISO can be directly connected.
The interrupt line is to tell arduino that data from a card ca be fetched


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