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Thread: Has Anyone EVER gotten MFRC522 RFID working with Teensy 3.2 I2C

  1. #1
    Member
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    Has Anyone EVER gotten MFRC522 RFID working with Teensy 3.2 I2C

    Lots of people using MFRC522 with SPI.. But I have a unique application where I need to use I2c.

    I've spent the better part of the w.e. trying various peoples' code, hacking little boards like this one:, Wwiting my own... etc.

    And trying combinations of libraries from:
    https://github.com/arozcan/MFRC522-I2C-Library
    https://github.com/miguelbalboa/rfid

    and a few others... But NONE seem to work.

    Has ANYONE ever succeeded in getting and I2C RC522 implementation?

    (or for that matter UART mode?)
    Last edited by awardblvr; 03-15-2021 at 03:50 PM. Reason: typ-o in title

  2. #2
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    Still no RC522 I2c users? ANYONE?

  3. #3
    Senior Member
    Join Date
    Nov 2012
    Posts
    1,606
    Have you tried an I2C scanner to see if the device is at least on the bus? If it doesn't find the device, have you got 4.7k pullup resistors on SDA and SCL?

    Pete

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