The challenge was to build a device to assist visually impaired users, to use a computer, through the use of music. The video shows a processing program that makes use of such a device and also the device.
The device I build is a keyboard-based instrument built using an arduino device, audio sampler, speakers and a keyboard.

Source code: github.com/blankdots/Blind_Beethoven

Previous demo: vimeo.com/6222285