Spindicator Clone

Some time ago I came across a website where I saw a novel way of showing the disk activity of a computer. I liked the idea very much and decided to make one on my own. Since the working of the circuit is explained in detail and very well on the original web site, in this entry I focus on the implementation.
A video of the working gadget can be found here.
For full details and instructions on how I made it please see the project's own page: http://diy.viktak.com/2011/02/spindicator-clone.html