Openterface Mini-KVM Toolkit

Configure or recover a nearby headless computer.

KVMHDMI captureUSBHomelab

Price: $129at crowdsupply.com
Availability: Listed
Design: Open

Where to buy · 3 shops

Compare with similar devices

Bring along: A host with the Openterface app and a powered target with HDMI output and USB control.
Keep in mind: 1080p30 capture; older BIOS USB-hub compatibility varies.

Source checked · Sep 16, 2026

Openterface Mini-KVM Toolkit — Image credit
Maker image · Openterface Mini-KVM unit; toolkit accessories are not shown. · TechxArtisan / Openterface

(02) Blueprint

Build it yourself

Open hardware

TechxArtisan publishes full v1.9 PCB Gerbers, schematic PDF, BOM and a STEP model under CERN-OHL-S-2.0 in a dedicated hardware repo; the Openterface_QT host app is separate open-source software.

PCB 3D model v1.9 (STEP)

Read straight from the maker’s repository. Open on GitHub

PCB 3D model v1.9 (STEP)

GitHub

Design files 5

Source 2

git clone https://github.com/TechxArtisanStudio/Openterface_Mini-KVM_Hardware.git

Key parts 2

MacroSilicon MS2109 All MS2109 devicesHDMI-to-USB3 capture chipDatasheet
WCH CH9329 All CH9329 devicesUSB-to-serial HID keyboard/mouse bridgeDatasheet

Research notes

All links curl-verified 200. v1.9/PCB1.11 is the newer of two revisions in the repo (v1.6 files also present).

Every link checked 2026-09-27.

Hand this device to your agent. Everything on this page, as clean Markdown and JSON: specs, shops, prices, design files, parts.

Markdown JSON

Made the Openterface Mini-KVM Toolkit? Put the badge on your README; it links here, with every shop that sells it.

Specifications

Exact package

Selection: Toolkit 392-OPMINIKVMTOOLKIT; Basic is a different bundle.
In the bag: Mini-KVM, quickstart, carry bag and extension-pin cap.
Video cable: 0.3 m HDMI male-to-male.
USB cables: 0.3 m C-to-A with A-female/C-male adapter; 1.5 m C-to-C with C-female/A-male adapter.
Size: 61 × 13.5 × 53 mm; 48 g for the device.

Connect and use

Host side: Orange USB-C side → host with the 1.5 m cable; install Openterface first.
Target side: Black USB-C → target USB; target video → HDMI input. Target needs no Openterface app.
Video limit: Up to 3840 × 2160 at 30 Hz input; capture up to 1920 × 1080 at 30 Hz.
Audio: Captures embedded HDMI audio.
Power: USB power can come from either side. Use a dedicated supply for low-power targets such as Raspberry Pi.
Optional USB devices: Connection guide limits peripherals to 1.5 W and recommends externally powered hubs.
File transfer: The switchable USB-A port moves an attached drive between host and target.
Revision-specific control: USB-port switching through software needs hardware v1.9 or newer.
Practical limit: Some older BIOS implementations do not recognize the internal USB hub.

Software and design files

Host downloads: Official apps for macOS, Windows, Linux and Android; select the host platform on the download page.
Firmware troubleshooting: The FAQ directs capture-firmware recovery to the QT releases. Follow the matching release instructions.
Hardware source: Schematics/design repository uses CERN-OHL-S-2.0; its documentation is declared CC BY-SA 4.0.
Useful outcome: A nearby laptop can provide the console for a headless SBC or mini-PC without a network KVM.

What still needs checking

The datasheet calls port ② a host connection; the dedicated connection guide identifies it as target keyboard/mouse output. This profile follows the connection guide.
The toolkit SKU does not establish the shipped PCB revision or capture firmware. Record both before publishing a tested setup.
The site navigation advertises an iPadOS app, while the dedicated app page lists four other platforms. iPad host requirements remain unverified here.
No exact recovery binary, universal BIOS compatibility, measured latency or adapter compatibility was tested.
Repository documentation has a stated CC BY-SA license; the scope of any selected product photo still needs an asset-level record. The media index includes third-party content.
Price, regional fulfillment and current checkout stock remain unverified.

Downloads & docs

Official Mini-KVM productopenterface.com Exact toolkit datasheetdocs.openterface.com Cable and port guidedocs.openterface.com Host application downloadsdocs.openterface.com Power, revision and firmware FAQdocs.openterface.com QT releases and recovery routegithub.com Hardware repository and documentation licensegithub.com Maker campaign and orderingcrowdsupply.com Maker's media indexopenterface.com

Source & revision notes

Maker listing checked Sep 16, 2026. Detailed documentation reviewed Sep 16, 2026. Not hands-on tested.

Price is a dated listing; confirm with the maker.

Primary-source claims checked independently; no hands-on testing or maker relationship. Price and checkout stock remain unverified.

Exact toolkit SKU 392-OPMINIKVMTOOLKIT; hardware revision is not guaranteed by this bundle identifier. USB switching from software requires v1.9+.

Independently checked against primary sources; no hands-on testing. Listed status does not guarantee stock, fulfillment, performance or accessory compatibility.

Build or list hardware with us