Build a cheap and simple full software controlled step-up (boost) converter to drive a LED string of 10 LEDs. LEDs are used as string to light up a acrylic engraved plate placed in a holder (also made out 5 layers of lasered black acrylic glas). Step up is from 5V to about 30V, current regulated to about 20mA.
[[Datei:PlexiglasStand.jpg|640px400px]][[Datei:Led stepup1.jpg|400px]]
[http://youtu.be/oMV0tqm9Ufk See video]