Keyboard

Overview

Comet Keyboard is a custom programmable keyboard designed for power users, developers, and serial texters likewise.
It is built on Vial-QMK, enabling real-time remapping while also supporting advanced firmware-level behaviors that go beyond standard QMK features, and includes an integrated touchpad for pointer input and navigation.

The design emphasizes ergonomic efficiency and minimal finger travel, with an architecture optimized for symbol-heavy workflows, intuitive layer usage, and clear visual feedback. By combining real-time GUI remapping, the extension delivers both flexibility and predictability without sacrificing comfort.

Hardware Specifications

MCU: STM32G431CBU6
Firmware: Vial-QMK
Trackpad IC: Azoteq IQS 9150
Keys:
LED Indicators:
- Caps Lock LED
- Fn Layer LED

Firmware Architecture

The firmware is built on Vial-QMK, that extends QMK with a secure, persistent configuration interface, allowing keyboards to be remapped in real time. It combines the robustness and flexibility of QMK’s firmware architecture with a lightweight GUI that communicates directly with the keyboard over USB. Allowing modifications in real-time. It also provides:

USB HID compliance
Real-time key remapping via Vial GUI
Persistent configuration storage
Standard QMK hooks

Keymapping and Layer Design

The keyboard uses three primary layers:

Base Layer (Layer 0)

Standard alphanumeric input
Custom Caps / Fn / Space behavior
Navigation keys
Mouse buttons

Fn Sticky Layer (Layer 1)

Activated via Fn tap
One-shot (auto-clears after a keypress)
Contains symbols and navigation shortcuts

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Fn Hold Layer (Layer 2)

Activated via Fn hold
Active only while Fn is physically held
Function keys and extended symbols

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Custom Key Behaviors

Caps Key (`CAPS_SFT`)

Caps behaves as a dual-function key:

Hold → Left Shift
Double Tap → Caps Lock toggle

Fn Key (`FN_KEY`)

Fn is implemented as a layer key with sticky support:

Action	Result
Tap	Sticky Layer 1
Hold	Momentary Layer 2
Release after use	Sticky cleared

Space Key (`KC_SPC`)

Space has a smart punctuation feature:

Single Tap → Space
Double Tap → . (period + space)

Vial Integration

The firmware is compiled with Vial enabled, allowing:

Live remapping
Layer visualization
Persistent configuration storage

You can download and install Vial from the homepage and follow their guide here to better customize your keyboard.

Remapping Guide

What You Can Do With Vial

Remap normal keys on any layer
Have your own custom macros and key-combos
Rearrange keys to match your preferred keyboard layout (QWERTY, Dvorak, custom, etc.)

Default Combo Cheatsheet

Physical Key / Action	Mapped To
Action L1	Escape
Action L2	Mouse Left Click
Action R2	Mouse Right Click
Action R1	Super / Windows Key
Shift	Double Tap → Caps Lock Single Tap → Sticky / Combine
Fn	Double Tap → Latch Fn Key Single Tap → Sticky / Combine
Q-P	Example: Default → `q` Shift + Q → `Q` Fn + Q → `1` Super + Q → `F1`
A-L	Example: Default → `a` Shift + A → `A` Fn + A → `@` Hold Fn + A → `~`
Fn + Backspace	Delete
Arrow Keys	Up, Down, Left, Right
Space Bar	Single Tap → Space Double Tap → `.` + Space
Tab	Fn + Arrow Right → Tab Fn + Arrow Left → Back Tab

Keyboard

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