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Gboard CAPS version

This directory contains the firmware and hardware design for Gboard CAPS version, which was released on Oct 1, 2023.

This is not an officially supported Google product.

Gboard CAPS version

Contents

The directory structure is as follows:

  • hardware/ : STL files for mechanical parts.
  • firmware/ : Arduino sketch.

Building Gboard CAPS Version

Parts

  • M5StickC Plus
  • SS-10GL13 micro switch
  • INC-100 bump cap insert
  • Grove connector cable
  • M3x10mm screw x 8
  • M2x8mm screw x 2
  • rubber band x 4
  • hot glue
  • heat shrink tubing
  • 160mm x 160mm x T2.5mm MDF board (or substitute a 3D printed part; see next section)

Hardware

Step 1: Prepare required parts

3D printed parts:

Other parts:

  • top plate: made of 160mm x 160mm x T2.5mm MDF board top plate
    Alternatively, you can 3D print this part (top_plate.stl)

Step 2: Wiring

Connect the NO and the C terminals of the micro switch to the black and yellow wires of the Grove cable, in any order. (These will be connected to port G33 and GND of M5StickC Plus.)
switch with wire harness

Step 3: Build

  1. Put 2 rubber bands across the two latches on the sliding plates.
    a

  2. Attach one of the top plate angle bracket mounts to one of the sliding plates and fasten using M3 screws. Repeat for the other set.
    outer_rail to top_plate_holder

  3. Fasten the angle bracket mount and sliding plate assemblies to the top plate using M3 screws
    top_plate_holder to top_plate 1
    top_plate_holder to top_plate 2

  4. Screw the micro switch to the switch mount.
    micro switch screwed on to a mount

  5. Glue the switch mount to one of the sliding plates. Check that the switch can be pressed by testing using one of the bump cap insert mounts.
    a

  6. Attach the mounts to the left and right side of the cap, and adhere using hot glue.
    a

  7. Combine the two parts by attaching the sliding plates to the rails on the bump cap insert mounts.

  8. Attach M5StickC Plus and connect the other side of the Grove connector that is attached to the micro switch.

Firmware

Step 1: Environment setup

  • Arduino IDE
  • Libraries

Step 2: Compile and upload

  • Compile and upload the mozc-caps.ino firmware to the M5StickC Plus using Arduino IDE.

Step 3: Calibration

  • IMU (gyro sensor) calibration
    • After powering on the M5StickC Plus, the firmware will run calibration for the IMU.
    • While the display shows "calibrating" message, keep the device still.
    • You can also trigger the calibration process by long-pressing Button A.
  • Setting the origin direction
    • When Button A is pressed, the origin direction is set to the current orientation of the device.

Step 4: Connect

Connect the keyboard via Bluetooth to a PC or other device that has Google Japanese Input/Gboard installed.

Note: This keyboard keeps sending keycodes even before you press the key. It is for showing a preview of the selected character to be input on the connected device.

License

Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.