A while ago I found some blog posts explaining how to use a LED matrix as a pendant (http://hackaday.com/2013/01/10/8x8-led-matrix-pendant-sealed-in-a-block-of-epoxy/
). The 8x8 matrix pendant looked cool, but it was missing detailed information on which parts to use and how to solder everything together.
With help from a friend, Uriel Guy, we managed to figure out how to make it work. Well, actually, Uriel did most of the work… including of cleaning up the code, modifying it to work with Arduino, and optimize it. I’m just writing the instructable because he got lazy :-)
By the way - the code itself is a piece of art. Check it out if you want to see how to implement 16 levels of red using the dot matrix.