# 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.**

## Adafruit GEMMA v2

Tiny 27mm round sewable wearable microcontroller with ATtiny85 at 8 MHz, 3 GPIO, Micro USB programming, 3.3V power, and reverse-polarity protection — ideal for small LED and NeoPixel wearable projects.

[Details](https://openhardware.directory/devices/adafruit-gemma-v2) | [Markdown](https://openhardware.directory/devices/adafruit-gemma-v2/md)

## Adafruit Trinket 3.3V

Tiny 27×15mm Arduino-compatible microcontroller board with ATtiny85 at 8 MHz, 3.3V logic, 8KB flash, 3 GPIO pins, and Micro USB programming for minimal space-constrained projects.

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

## Adafruit Trinket 5V

Tiny 31×15mm Arduino-compatible microcontroller with ATtiny85 at 8–16 MHz, 5V logic, 8KB flash, 3 GPIO pins, and Micro USB — the 5V variant for interfacing with 5V sensors and NeoPixel LEDs.

[Details](https://openhardware.directory/devices/adafruit-trinket-5v) | [Markdown](https://openhardware.directory/devices/adafruit-trinket-5v/md)