Add mozc dial version.

Co-authored-by: Takashi Toyoshima <toyoshim@google.com>
Co-authored-by: Shun Ikejima <ikejima@google.com>

mozc-dial/buildguide.md

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+# Build Guide
+
+![Gboard DIY](./images/diy.webp)
+
+[Read the project overview first](./README.md)
+
+## File List
+
+- stls/ : STL files for the case
+- stls/one_dial/ : For the 1-dial edition
+- stls/full/ : For the 9-dial edition (Stay tuned!)
+- pattern/ : Encoder pattern files
+- board/ : KiCad schematics and board layout data
+- board/gerber/ : Gerber data for PCB production and assembly
+- firmware/ : Firmware development resources for Raspberry Pi Pico C/C++ SDK
+- firmware/prebuilt : Pre-built firmware binaries
+
+## Assembly
+
+We have prepared a 1-dial edition, which is easier to assemble with only one dial, and a full edition with nine dials.
+
+### 1-Dial Edition
+
+![1-Dial Edition](./images/one-dial.webp)
+
+#### Required Parts
+
+- 3D printed parts (1 of each)
+  - Bottom case (case_bottom.stl)
+  - Top case (case_top.stl)
+  - Dial (dial.stl)
+  - Dial cap (dial_cap.stl)
+  - Encoder (encoder.stl)
+  - Clutch (clutch.stl)
+  - Fixing cover (cover.stl, print in a color close to white, such as gray)
+  - Triple claw (end3.stl)
+- Encoder pattern pattern/one_dial.svg
+- Screws
+  - 12 self-tapping screws, 2mm diameter, 4mm length
+  - 2 washers
+- Electronic parts ([see the board directory for details](./board/README.md))
+  - 1 [Firmware installed](./firmware/README.md) Raspberry Pi Pico
+  - 2 assembled sensor boards
+  - 1 [Unipolar Stepping Motor 28BYJ-48 5V](https://akizukidenshi.com/catalog/g/g113256/)
+  - 1 [Motor driver module](https://www.aitendo.com/product/12366)
+  - Wiring materials: as needed
+
+#### Step 1: Create the Encoder
+
+Print the [pattern file](./pattern/one_dial.svg) on copy paper at actual size.
+Place the encoder part on top with the printed side down, glue it, and cut around the perimeter and the center.
+
+Align the ◆ mark on the encoder part with the ▼ mark on the paper.
+
+![Align the marks](./images/encoder-mark.webp)
+
+![Assembled encoder](./images/encoder.webp)
+
+#### Step 2: Assemble the Cover Module
+
+The cover needs to be printed in a non-transparent color because it uses a photosensor.
+In the prototype, we used gray PLA.
+You may need to adjust the resistance of the sensor board for other colors.
+
+Screw the two sensor boards to the back.
+
+Also, screw the stepping motor to the back.
+
+We call the sensor board near the motor as "Sensor L" board and other one as "Sensor H" board.
+
+![Back side](./images/cover-back.webp)
+
+Attach the clutch to the motor shaft protruding from the front.
+
+![Front side](./images/cover-front.webp)
+
+#### Step 3: Attach to the Case
+
+From the back, attach the encoder and then the cover.
+Refer to the photo below for the orientation of the cover.
+
+![Assembly](./images/assemble.webp)
+
+From the front, attach the dial and cap to the shaft.
+There are small marks on the dial and shaft, so align them.
+
+![Marks on the dial](./images/mark-on-encoder.webp)
+
+Attach the dial cap from the top and secure it with a screw.
+
+![Overall view](./images/one-dial.webp)
+
+#### Step 4: Wiring
+
+Attach the sensor board and motor driver to the Raspberry Pi Pico.
+
+![Wiring](./images/one-dial-connection.png)
+
+Please check [board assembly guide](./board/README.md) for details.
+
+Secure the board to the edge of the bottom case with double-sided tape or similar.
+
+### 9-Dial Edition
+
+**The 9-dial edition is currently under adjustment.**
+
+![9-Dial Edition](./images/nine-dial.webp)
+
+#### Required Parts
+
+- 3D printed parts
+  - 1 each of left and right bottom cases
+  - 1 each of left and right top cases
+  - 9 dials (including the enter key)
+  - 9 dial caps
+  - 5 types of encoders, 9 in total
+    - 1 for 6 bits
+    - 1 for 4 bits
+    - 3 for 3 bits
+    - 3 for 2 bits
+    - 1 for 1 bit
+  - 9 clutches
+  - 2 types of fixing covers, 9 in total
+    - 7 small
+    - 2 large
+  - 3 types of over-rotation prevention claws, 9 in total
+    - 8 small
+    - 1 triple
+- 9 types of encoder patterns
+- Screws
+  - About 100 self-tapping screws, 2mm diameter, 4mm length
+  - 18 washers
+  - A few M3 bolts and nuts
+- PCB
+  - 11 sensor boards
+  - 1 main board (assembled)
+- Electronic parts ([see the board directory for details](./board/README.md))
+  - 1 assembled main board with [2 firmware installed](./firmware/README.md)
+  - 11 assembled sensor boards
+  - 9 [Unipolar Stepping Motors 28BYJ-48 5V](https://akizukidenshi.com/catalog/g/g113256/)
+  - Wiring materials: as needed
+
+### Assembly
+
+#### Step 1: Connect Left and Right
+
+Connect the left and right bottom cases with four M3 screws.
+
+![Connect left and right](./images/connect-left-and-right.webp)
+
+#### Step 2: Create the Encoder
+
+Same as the 1-dial edition.
+
+#### Step 2: Assemble the Cover Module
+
+Basically the same as the 1-dial edition.
+
+Attach only one sensor board to seven of the covers.
+Attach two sensor boards to two of the covers.
+
+#### Step 3: Attach to the Case
+
+Basically the same as the 1-dial edition.
+
+#### Step 4: Wiring
+
+Wire the motor and sensor board to the dedicated main board.