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The Lynx CAT is a modular DIY input-device project that can combine a keyboard with mouse or joystick controls. Its official build documentation provides printable case files, hardware details, and software references under the GNU General Public License version 3. The documented build includes a mouse module and optional thumb joystick; a trackball is listed as a future feature, not confirmed as a current release.
What the Lynx CAT is
LYNXware describes the CAT as a configurable input-device system rather than one fixed mouse or keyboard. Its official DIY page documents finger and thumb modules, keyboard keys, a mouse module, a scroll-wheel option, and a gyroscope module. The design uses a BPI-Leaf-S3 controller. See the official LYNXware DIY documentation for the current published files and build details.
The project is intended to let builders arrange input functions around their needs. That flexibility is the maker’s stated goal, not evidence that the device is comfortable or suitable for every person. The documentation also identifies optimizing the design for different hand sizes as future work.
Which pointing options are documented?
Mouse module
The official DIY page documents a mouse module. Its listed components include an ADNS5050 sensor, a lens, and a red 3 mm LED. The project also identifies mouse-related parts such as skates in its build information. These details describe the documented module, not a complete bill of materials for every possible CAT configuration.
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Thumb joystick
An optional joystick can be incorporated into a thumb module. The official page lists an analog joystick among the components associated with the build. This provides an alternative pointing control alongside the documented mouse module.
Trackball: listed as a future feature
The official DIY page lists a “Trackball module” among future features. An older Hackster project report describes a trackball variant, but that dated coverage does not establish that a trackball module is currently released. Check the current project files before planning a trackball build.
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Keyboard layout and module choices
The official documentation shows finger modules, thumb modules, a thumb module with joystick, a finger module with scroll wheel, a mouse module, and a gyroscope module. It describes a switch matrix with diodes intended to prevent ghosting and blocking when multiple keys are pressed simultaneously.
Specifications vary by project description and date. Hackster reported up to 25 buttons for an early configuration. In a January 25, 2024 overview, KBD.news described a later split CAT family with 42–62 keys, a columnar layout, mouse switches, and a 3D-printed case. That report said a finger module had 20 keys, or 17 when its inner column was replaced by a roller encoder. These are dated descriptions, not independently verified specifications for every current configuration.
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| Option | What the sources establish |
|---|---|
| Mouse | Documented on the official DIY page; the listed electronics include an ADNS5050 sensor, lens, and red 3 mm LED. |
| Joystick | An optional thumb joystick is documented; the official page lists an analog joystick. |
| Trackball | Listed among future features on the official DIY page; older Hackster coverage describes a variant but does not confirm a current release. |
| Scroll wheel | The official page shows a finger module with scroll wheel. |
| Gyroscope | The official page shows a gyroscope module and associated circuit. |
Printing and building the DIY version
The official project provides STL files and print settings. It specifies a 0.4 mm nozzle and 0.2 mm layer height, except for keys, which use 0.12 mm. The listed parts are described as printable without supports. Infill is left to the builder’s preference for the desired weight.
The build involves more than printing a shell: the published project links to electronics and module details, firmware, and key-assignment software. It names the BPI-Leaf-S3 controller and components including wires, pins, pads, and skates across its build information. It also says module PCBs can be ordered from JLCPCB. Check the current official files for the parts and connections required by the specific modules you intend to build; the listed components should not be treated as universally mandatory for every configuration.
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Firmware, software, and license
The official setup describes PlatformIO with the espressif32 platform, the bpi_leaf_s3 board, and the arduino framework. LYNXware links the CAT firmware and LYNXapp source code from its DIY page, which is the place to follow for current project instructions.
The official page states that the DIY material is licensed under GNU General Public License version 3. The existence of open-source files makes it possible to inspect and adapt the published design under that license; it does not eliminate the practical work of printing, sourcing components, assembling modules, and setting up software.
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Is it a fit for your setup?
The CAT may be worth exploring if you want a buildable, modular keyboard-and-pointer project and are prepared to work with 3D prints, electronics, and firmware. Decide based on the actual modules and file availability rather than assuming that every feature named in older coverage is ready to build.
- Choose it for customization: the documented modules let builders consider mouse, joystick, scrolling, keyboard, or gyroscope functions in different combinations.
- Budget for DIY work: the project supplies print files and technical references, but building requires sourcing the relevant electronics and assembling the chosen modules.
- Verify the desired pointer: mouse and joystick options are documented; current trackball availability is not established by the official page.
- Don’t treat the design as a proven ergonomic solution: the cited sources offer project descriptions and maker intentions, not clinical or comparative evidence for comfort, health, accessibility, precision, or productivity.
The maker has described the CAT as a way to tailor controls for different users and tasks, including Blender shortcuts. That is personal motivation and design intent, not a measured result. The source set does not establish that a CAT build will reduce hand movement or outperform conventional devices.
DIY files or prebuilt unit?
The official LYNXware DIY page is the source for published files and build instructions. KBD.news reported in January 2024 that prebuilt products were available alongside open-source builds, but that dated report does not confirm what is currently for sale. Consult the project site for current availability rather than relying on the older report.
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