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Author Topic: Problem writing to the MFRC522 with Arduino Uno R2  (Read 850 times)
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Northfield, MN
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Has anyone created or found code that will allow me to write info to the 13.56 Mhz card? I have found some sample code that i was able to modify and use for reading cards but have no idea on where to start for writing information.
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BCC AZ USA
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It gets hot so it must be working
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Which interface?  SPI, I2C, UART?
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Northfield, MN
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Preferably SPI but any of the above would be appreciated. Right now I am stumped.
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the example code here has write support. i havent tried it as i have no writable tags yet, but it compiles fine and works just fine for reading tags at least. it does look like it function-izes all the commands so you dont have to mess with the hex.

as a note: if you sign up with TI you can get free samples of rfid tags, theres only a few that are 13.56mhz but you can get 5 of each of up to 5 products so 25 tags smiley they have one of the best and most generous and unstingy samples policy, probably to retain some market dominance
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Northfield, MN
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Where exactly is that code you mentioned, I would love to try it out.

Thanks for the TI tip. I will see if they are willing to send me some samples.
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A simple google on MFRC522 gives me

http://projects.schneidr.de/2013/05/mfrc522-and-arduino/
https://github.com/mxgxw/MFRC522-python/blob/master/MFRC522.py
https://github.com/miguelbalboa/rfid

and lots more ...
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