# 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.

**4 device listed.**

## makerdiary nRF52840-MDK USB Dongle

Open-source multi-protocol wireless USB dongle based on the Nordic nRF52840 SoC. Supports BLE 5.4, Thread, Zigbee, 802.15.4, NFC, and USB 2.0 with UF2 drag-and-drop bootloader. Priced at $12.99.

[Details](https://openhardware.directory/devices/makerdiary-nrf52840-mdk-usb-dongle) | [Markdown](https://openhardware.directory/devices/makerdiary-nrf52840-mdk-usb-dongle/md)

## nice!nano v2 Wireless Keyboard Controller

Pro Micro drop-in replacement wireless keyboard controller built on the nRF52840 with BLE 5.0, onboard LiPo charger, mid-mount USB-C, and UF2 bootloader. The most popular controller for ZMK wireless split keyboards at $25.

[Details](https://openhardware.directory/devices/nice-nano-v2-wireless-keyboard-controller) | [Markdown](https://openhardware.directory/devices/nice-nano-v2-wireless-keyboard-controller/md)

## Adafruit Feather nRF52840 Express

Feather board with nRF52840 ARM Cortex-M4F at 64MHz, BLE 5.0, native USB (CDC/HID/MIDI/MSC), 1MB flash, 256KB SRAM, 2MB QSPI flash, 21 GPIO, SWD debug, and LiPo charging. Supports Arduino and CircuitPython.

[Details](https://openhardware.directory/devices/adafruit-feather-nrf52840-express) | [Markdown](https://openhardware.directory/devices/adafruit-feather-nrf52840-express/md)

## Adafruit Grand Central M4 Express

Arduino Mega-form-factor board with ATSAMD51P20 Cortex M4F at 120MHz, 1MB flash, 256KB RAM, 8MB QSPI flash, 70 GPIO pins, SD card slot, 8 SERCOM, 22 PWM outputs, dual DAC/ADC, AES-256, and native USB.

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