Open-source keyboard firmware

Two halves. One wireless system.

LYNXware v4 connects split ergonomic keyboard halves over ESP-NOW. LYNXcat captures. LYNXtower routes. USB HID out.

Read the Architecture View the Firmware

How it works

[LYNXcat]                              [LYNXtower]
 Capture Node                          Processing Hub
─────────────                          ──────────────
Hardware Drivers                            Router
     ↓                                    ↓  ↓  ↓
Raw InputActions  ───── ESP-NOW ────→  Pipelines:
     ↓               (~0.5ms)          • Keyboard → RMK → USB
InputFrame                             • Mouse → Accumulator → USB
                                       • Sensor → Handler → (future)

LYNXcat Capture Node

Read hardware, encode, transmit — nothing more.

LYNXtower Processing Hub

Route, map, process, output USB HID reports.

Where do you want to start?

Using LYNXware

Pair your cats to the tower, assign keys in Vial, explore the LYNXgram default layout.

Understanding the Firmware

Capture-Process architecture, three async pipelines, ESP-NOW over ESP32-S3.

Contributing

Navigate the cat and tower crates, understand key-index transforms, read the build flags.