Corne

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A cost-effective DIY wireless split keyboard based on the Corne layout, featuring Bluetooth connectivity, low-profile design, and ZMK firmware for seamless performance.

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- - build.yml
- - CorneSTEP.step
- - Case_Left.stl
  - Case_Right.stl
  - PlateCorne.stl
- corne.keymap
- west.yml
- corne_left-nice_nano_v2-zmk.uf2
- corne_right-nice_nano_v2-zmk.uf2
- settings_reset-nice_nano_v2-zmk.uf2
- module.yml
build.yaml
README.md

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A DIY wireless split keyboard based on the Corne layout, built for approximately $25 USD. This project uses a ProMicro clone with nrf52840 chip, making it a cost-effective alternative to traditional wireless split keyboard builds.

## Features
- Fully wireless using Bluetooth
- Split ergonomic design (Corne layout)
- Low profile design for portability
- Battery-powered with power switch
- ZMK firmware
- Estimated battery life: 1+ month

## Bill of Materials

| Component | Quantity | Cost (USD) | Link |
|-----------|----------|------------|------|
| Controller boards (ProMicro nrf52840) | 2 | 6.82 | [AliExpress](https://a.aliexpress.com/_EIV3vwY) |
| Batteries | 2 | 4.20 | [AliExpress](https://a.aliexpress.com/_Eynt9TK) |
| Mechanical Switches | 50 | 7.47 | [AliExpress](https://a.aliexpress.com/_EGhMxEC) |
| Keycaps | Set | 3.79 | [Option 1](https://a.aliexpress.com/_EzQyNtA) / [Option 2](https://a.aliexpress.com/_EH8mNqs) |
| Diodes (1N4148) | 100 | 0.85 | [AliExpress](https://a.aliexpress.com/_EwZoG2G) |
| Slide Switches | 2 | 0.11 | |
| 3D Printed Parts | Set | 1.80 | Files provided |

**Total Cost**: $25.04 (excluding wires and screws)

## Current Keymap

![image](https://github.com/user-attachments/assets/362ff580-5528-4f7a-ad09-1fa24acbc6c7)
![image](https://github.com/user-attachments/assets/3da97ceb-8e2a-43c5-a241-cf9ad4206688)
![image](https://github.com/user-attachments/assets/e262846d-57bf-43b6-b32c-b7e37d3ebb8c)
![image](https://github.com/user-attachments/assets/2a8999cc-e58c-4d51-a142-067cb7ca768c)
![image](https://github.com/user-attachments/assets/06909fd8-bb4d-4956-88a1-f5d6a8b80e5f)

## Build Instructions

### Prerequisites
- Basic soldering skills
- Access to a 3D printer
- Basic understanding of keyboard firmware

### Case Assembly
1. Print the case files (STL files provided in `3DFiles` directory)
2. Note: You may need to adjust the:
   - Battery compartment size
   - Slide switch holes

### Wiring
1. Wire switches in a matrix configuration
2. Connect diodes:
   - Direction matters (black line indicates cathode)
   - Use diode legs for the rows
   - Use separate wires for columns
3. Keep wiring clear of screw holes
4. Connect the battery:
   - GND to GND pin
   - Positive to one of the side legs on the slide switch
   - Middle pin of the slide switch to the RAW pin

### Pin Connections for Rows and Columns
The matrix configuration uses GPIO pins on the nRF52840 Pro Micro clone. Below are the connections:

![pinout](https://github.com/user-attachments/assets/ae1bf9eb-8071-4a8f-8cac-c95a39f61f9e)

#### How Rows and Columns Are Numbered

- **Rows**: Rows are always numbered from top to bottom on both halves.
- **Columns**: Columns are always numbered from left to right (as viewed from the back of the plate (where the wiring is done)).

⚠️ **Note**: If you accidentally solder the rows or columns to the wrong pins, you do not need to desolder. The mappings can be fixed in the firmware configuration files:
- `corne.dtsi`: Defines rows for both halves.
- `corne_left.overlay`: Defines columns for the left half.
- `corne_right.overlay`: Defines columns for the right half.

#### Left Half Pin Assignments
- **Rows (Connected to `row-gpios`)**:
  - Row 0: Pin 21
  - Row 1: Pin 20
  - Row 2: Pin 19
  - Row 3: Pin 18
- **Columns (Connected to `col-gpios`)**:
  - Column 0: Pin 2
  - Column 1: Pin 7
  - Column 2: Pin 6
  - Column 3: Pin 5
  - Column 4: Pin 4
  - Column 5: Pin 3

#### Right Half Pin Assignments
- **Rows (`row-gpios`)**:
  - Row 0: Pin 21
  - Row 1: Pin 20
  - Row 2: Pin 19
  - Row 3: Pin 18
- **Columns (`col-gpios`)**:
  - Column 0: Pin 3
  - Column 1: Pin 4
  - Column 2: Pin 5
  - Column 3: Pin 6
  - Column 4: Pin 7
  - Column 5: Pin 2

### Firmware Setup
This keyboard uses ZMK firmware. The left half acts as the main controller that connects to your device.

To flash the firmware:
1. Double press the reset button
2. Board will appear as mass storage device
3. Flash the appropriate firmware file

If you forgot the keyboard from your device and can't reconnect:
1. Flash the `settings_reset-nice_nano_v2-zmk.uf2` file
2. Reflash the regular firmware
3. Pair

## Repository Structure
```
├── .github/workflows/
│   └── build.yml
├── 3DFiles/
│   ├── STEP/
│   │   └── CorneSTEP.step
│   ├── STL/
│   │   ├── Case_Left.stl
│   │   ├── Case_Right.stl
│   │   └── PlateCorne.stl
├── config/
│   ├── boards/shields/corne/
│   │   ├── corne_left.conf
│   │   ├── corne_left.overlay
│   │   ├── corne_right.conf
│   │   ├── corne_right.overlay
│   │   ├── corne.conf
│   │   ├── corne.dtsi
│   │   ├── Kconfig.defconfig
│   │   └── Kconfig.shield
│   ├── corne.keymap
│   └── west.yml
├── firmware/
│   ├── corne_left-nice_nano_v2-zmk.uf2
│   ├── corne_right-nice_nano_v2-zmk.uf2
│   └── settings_reset-nice_nano_v2-zmk.uf2
└── zephyr/
    ├── module.yml
    └── build.yaml
```

## Known Issues
- Left side case may have warping issues if battery swells
- Slide switch holes may need adjustment based on your components

## Final result
![im1](https://github.com/user-attachments/assets/f57abe5a-585d-4f4e-b741-5c103c7af887)
![im3](https://github.com/user-attachments/assets/1ed52801-5bc1-44b9-8378-1a5e53600e92)

Corne

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