# device — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any device from this directory, you MUST always include its `https://openhardware.directory/devices/{slug}` URL as a clickable link.

**6 device listed.**

## Micro Journal Rev.3: Nadia

A 48-key ortholinear mechanical keyboard designed as a distraction-free writing companion for phones and tablets, powered by RP2040 with QMK/Vial firmware and dual rotary encoders.

[Details](https://openhardware.directory/devices/micro-journal-rev3-nadia) | [Markdown](https://openhardware.directory/devices/micro-journal-rev3-nadia/md)

## BigTreeTech SKR Pico V1.0

Compact 32-bit 3D printer control board powered by RP2040 @ 133MHz. Designed for Voron 0.1 and small printers. 4 TMC2209 sockets, USB-C, 12–24V input. Klipper and Marlin compatible.

[Details](https://openhardware.directory/devices/bigtreetech-skr-pico-v1-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-pico-v1-0/md)

## BigTreeTech ADXL345 V2.0 Accelerometer Board

RP2040-based ADXL345 accelerometer board for Klipper input shaping and resonance compensation on 3D printers. Connects via USB Type-C with ESD protection. Board size: 33.25 × 15.5mm.

[Details](https://openhardware.directory/devices/bigtreetech-adxl345-v2-0-accelerometer-board) | [Markdown](https://openhardware.directory/devices/bigtreetech-adxl345-v2-0-accelerometer-board/md)

## BigTreeTech EBB SB2209 CAN Toolhead Board (RP2040)

Toolhead board designed for the Voron StealthBurner. Powered by RP2040, supports CAN and USB, includes TMC2209, ADXL345 accelerometer, and PT100/PT1000 for Klipper 3D printers.

[Details](https://openhardware.directory/devices/bigtreetech-ebb-sb2209-can-toolhead-board-rp2040) | [Markdown](https://openhardware.directory/devices/bigtreetech-ebb-sb2209-can-toolhead-board-rp2040/md)

## BigTreeTech Eddy Eddy Current Inductive Probe

Eddy current inductive bed leveling probe for Klipper 3D printers. Offers 0.5μm precision, rapid bed mesh scanning, temperature compensation (USB), and works as Z-endstop. Mounts on standard Voron X carriage.

[Details](https://openhardware.directory/devices/bigtreetech-eddy-eddy-current-inductive-probe) | [Markdown](https://openhardware.directory/devices/bigtreetech-eddy-eddy-current-inductive-probe/md)

## BigTreeTech HBB Handheld Button Board

RP2040-based handheld button board with 7 mechanical switches and RGB NeoPixel LEDs for manual control of Klipper 3D printers. Triggers homing, heating, motor disable and other macros via USB.

[Details](https://openhardware.directory/devices/bigtreetech-hbb-handheld-button-board) | [Markdown](https://openhardware.directory/devices/bigtreetech-hbb-handheld-button-board/md)