That means you can have the CUI appear to be any USB HID device you want: keyboard, mouse, game controller, etc. The Arduino has a friendly development environment and a large following though.

The idea early on was to leverage existing Arduino libraries to connect with a standard USB mouse, specifically, the hardware would take the form of an Arduino Mega 2560 with a USB Host Shield.

Instead of spending $149 on Apple’s standalone Magic Trackpad, Taliyah Huang designed and built a custom split keyboard with its own mouse and trackpad functionality built right in.

Arduino has announced the new UNO R4 board family for prototyping and learning. The new models feature a faster microcontroller, a USB-C connector, improved power, Wi-Fi and Bluetooth LE, and more.