# 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.

**3 device listed.**

## Circuit Playground Bluefruit

Round educational microcontroller with Nordic nRF52840 (64MHz Cortex-M4F + BLE), 10 NeoPixels, accelerometer, microphone, light sensor, speaker, 8 alligator-clip I/O pads, and USB. Runs CircuitPython, MakeCode, and Arduino.

[Details](https://openhardware.directory/devices/circuit-playground-bluefruit) | [Markdown](https://openhardware.directory/devices/circuit-playground-bluefruit/md)

## Adafruit ItsyBitsy nRF52840 Express

Tiny breadboard-friendly Bluetooth LE board with Nordic nRF52840 Cortex-M4F @ 64MHz, 1MB Flash, 256KB RAM, 2MB QSPI Flash, 21 GPIO, and native USB — all in a 36×17.6mm footprint. Supports CircuitPython and Arduino.

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

## Adafruit Feather nRF52840 Sense

Sensor-rich BLE Feather with Nordic nRF52840 (64MHz Cortex-M4F), 6 onboard sensors (9-DoF IMU, magnetometer, proximity/light, PDM mic, humidity, barometric pressure), 21 GPIO, and FCC/IC/TELEC certified.

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