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Thread: Teensy 4.1 as HID pass-through for one-handed keyboard?

  1. #1
    Senior Member
    Join Date
    Oct 2019

    Teensy 4.1 as HID pass-through for one-handed keyboard?

    I want to be able to type efficiently with one hand. I have a left-handed gaming keyboard with extra buttons accessible to the pinky and thumb that can easily be used as SHIFT\ALT\CTRL modifier keys. I want to use my thumb and pinky for modifiers (to select character sets) and my center three fingers for character selection.

    Windows OS has tools for custom keyboard layouts, but they don't work for this because they don't support modifier keys or extra buttons on gaming keyboards. I considered getting a PCB made that custom-fits my hand and using a Teensy in HID mode, but if I can use a Teensy both in USB HID and USB host, I can use the Teensy 4.1 as an intermediary between the PC and a retail gaming keyboard without getting a PCB made.

    It seems like someone might have done this before and there are already projects out there. Any help?

  2. #2
    Junior Member
    Join Date
    May 2021
    Teensy 4.1 can act as a keyboard to the PC and you can connect the gaming keyboard to the Teensy with a USB Host cable.

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