As a minimalized version of Arduino Leonardo, it enjoys similar powerful functionalities. Beetle aims to solve problems of low-cost controller, ease-of-using properly, and to provide a low cost solution for disposable projects, such as DIY projects, workshops, gift projects, E-Textiles and educational. For students and makers who can not afford too much on hardware purchasing, Beetle can be a great solution for them.
With the release of the Adafruit Trinket (Attiny85 based) a tutorial is now available on the great Adafruit Learning System for a Trinket USB volume control example.
After Purchasing a Trinket to experiment with and Adafruit having a great mentality for Open Source Hardware, I decided to modify my own Attiny85 volume control PCB to make it compatible with the Trinkets 5Volt firmware (flash_me_hv_5volt.hex)! (which is Arduino compatible) This gives access to direct programming without the need for a separate programmer from the Arduino IDE. Its also nice to support the hard work done at Adafruit by purchasing one of their Trinkets.