# 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.

**12 device listed.**

## Heltec MeshSolar

Solar-powered nRF52840 + SX1262 LoRa dev board with integrated BMS supporting 1-4 cell lithium batteries, MPPT solar charging, and USB PD3.0. Designed for Meshtastic solar nodes.

[Details](https://openhardware.directory/devices/heltec-meshsolar) | [Markdown](https://openhardware.directory/devices/heltec-meshsolar/md)

## Heltec MeshTower

High-power Meshtastic relay/repeater kit with nRF52840 + SX1262 LoRa, 18V/10W solar panel, 3x2800mAh battery pack, IP66 aluminum enclosure, and 5.5dBi fiberglass antenna.

[Details](https://openhardware.directory/devices/heltec-meshtower) | [Markdown](https://openhardware.directory/devices/heltec-meshtower/md)

## DFRobot Maqueen Plus V3

Advanced micro:bit STEM robot with 8x8 matrix laser ranging, 5 line-tracking sensors with intersection recognition, magnetic encoders, PID control, and 6 RGB LEDs. Programmable via MakeCode and MicroPython.

[Details](https://openhardware.directory/devices/dfrobot-maqueen-plus-v3) | [Markdown](https://openhardware.directory/devices/dfrobot-maqueen-plus-v3/md)

## Ai-Thinker Ra-09-DTU

Intelligent wireless LoRaWAN DTU with isolated RS485 interface, powered by STM32WLE5CCU6 ARM Cortex-M4 MCU with integrated Sub-GHz radio. Wide 6-36V input for industrial deployment.

[Details](https://openhardware.directory/devices/ai-thinker-ra-09-dtu) | [Markdown](https://openhardware.directory/devices/ai-thinker-ra-09-dtu/md)

## Netduino Plus 2

The Netduino Plus 2 is an Arduino R3-compatible .NET Micro Framework development board with a 168MHz ARM Cortex-M4 processor, built-in Ethernet, microSD slot, and 12-bit ADC — offering C# programming for connected embedded applications.

[Details](https://openhardware.directory/devices/netduino-plus-2) | [Markdown](https://openhardware.directory/devices/netduino-plus-2/md)

## Netduino 3 WiFi

The Netduino 3 WiFi is a .NET Micro Framework development board with an STM32F427 ARM Cortex-M4 at 168MHz, integrated WiFi with WPA2/SSL support, Arduino shield compatibility, and 3 GOBUS expansion ports for rapid IoT prototyping in C#.

[Details](https://openhardware.directory/devices/netduino-3-wifi) | [Markdown](https://openhardware.directory/devices/netduino-3-wifi/md)

## Netduino 3

The Netduino 3 is an open-source .NET Micro Framework development board powered by the STM32F427VG ARM Cortex-M4 at 168MHz, featuring Arduino shield compatibility, 3 GOBUS ports, and 6 analog input channels for C# embedded development.

[Details](https://openhardware.directory/devices/netduino-3) | [Markdown](https://openhardware.directory/devices/netduino-3/md)

## Netduino 3 Ethernet

The Netduino 3 Ethernet is a .NET Micro Framework board with an STM32F427VI ARM Cortex-M4 at 168MHz, wired Ethernet with full TCP/IP stack, microSD storage, Arduino shield compatibility, and 3 GOBUS ports for C# network-connected embedded projects.

[Details](https://openhardware.directory/devices/netduino-3-ethernet) | [Markdown](https://openhardware.directory/devices/netduino-3-ethernet/md)

## Adafruit Metro M4 Express (ATSAMD51)

Arduino-compatible development board with ATSAMD51 ARM Cortex-M4F at 120 MHz, 512KB flash, 192KB RAM, 2MB QSPI flash, dual 1 MSPS DACs, crypto engine, NeoPixel, and native USB. CircuitPython and Arduino IDE compatible.

[Details](https://openhardware.directory/devices/adafruit-metro-m4) | [Markdown](https://openhardware.directory/devices/adafruit-metro-m4/md)

## Adafruit Feather nRF52 Bluefruit LE (nRF52832)

nRF52832 ARM Cortex-M4F Feather board with native Bluetooth 5 LE at 64 MHz, 512KB flash, 64KB RAM, 8 analog inputs, 12 PWM channels, and built-in LiPo charger. FCC/IC/TELEC certified for production BLE products.

[Details](https://openhardware.directory/devices/adafruit-feather-nrf52832) | [Markdown](https://openhardware.directory/devices/adafruit-feather-nrf52832/md)

## BigTreeTech SKR Pro V1.1

32-bit 3D printer control board powered by STM32F407ZGT6 @ 168MHz. Supports 6 stepper drivers, triple extruder, dual Z, 12–24V input. Compatible with Marlin and Klipper firmware.

[Details](https://openhardware.directory/devices/bigtreetech-skr-pro-v1-1) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-pro-v1-1/md)

## BigTreeTech Octopus V1.1

32-bit 3D printer control board with STM32F446ZET6 MCU, 8 stepper driver slots (9 outputs), CAN bus via RJ11, USB-C, WiFi header, and support for Marlin and Klipper firmware.

[Details](https://openhardware.directory/devices/bigtreetech-octopus-v1-1) | [Markdown](https://openhardware.directory/devices/bigtreetech-octopus-v1-1/md)