We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. Trinket may be small, but do not be fooled by its size! It’s a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. I have created an Arduino library that will transform your Trinket into an USB keyboard, and give you an example of how to use the library to create a two button keyboard. The easiest and most useful is an HID keyboard, which is a device that does not require a driver, and acts just like a plain keyboard, but a little more customized. However, USB 1.1 cannot do stuff like virtual serial ports or mass storage devices, these require USB 2.0, sorry.

Custom devices (you have to write your own driver though).

MIDI devices (input notes from sensors, or generate outputs from notes, etc).

many more… the drivers come from the operating system.For example, under USB 1.1, you can make low speed USB devices such as…

The Trinket’s USB port is used for uploading sketches, but you can also use it for some basic USB 1.1 devices. Turning the Trinket into a standard USB keyboard! Frank shows you how! Tutorial – Make an Adafruit Trinket USB Keyboard – HID The Adafruit Learning System.

Adafruit trinket 5v wiring