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Thread: Full-Size USB host shield with Teensy 3.5 gives some weird errors

  1. #1
    Junior Member
    Join Date
    May 2019

    Full-Size USB host shield with Teensy 3.5 gives some weird errors

    Hi! I have two kind of usb host shields that I'm trying to get working with my teensy 3.5. The first shield is a Keyes USB host Shield, the big blue normal one. The other one is a Sparkfun shield.
    When I plug them into my Arduino Uno and run board_qc everything works flawlessly but when I then move over to my teensy I get:
    "Reading REVISION register... Die revision invalid. Value returned: 09"
    I have seen value 00 and FF as errors if some cable isn't connected but I have never seen 09.
    I moved over each pin from the arduino to the teensy equally, 9 to 9, 10 to 10 and so on. The only pin I'm not sure of is the resest pin. I plug it into teensyns reset pin but it still gives me 09.

    I'm using the USB_Host_Shield_2.0 library and I'm running both USB Host shield boards at 3.3v

    Any suggestion why this could be?

  2. #2
    Senior Member+ KurtE's Avatar
    Join Date
    Jan 2014
    I have not had much luck with a couple of the host shields I have tried...

    But you might search the forum, as there have been a few threads, like:

    Also there is a web page:

    Good luck... Or use a T3.6 which has USB hardware support built in

  3. #3
    Senior Member+ Theremingenieur's Avatar
    Join Date
    Feb 2014
    Colmar, France
    I’d suggest to move over to a Teensy 3.6 which has an onboard USB host.

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