- Minimal hardware
- Wiring more complex than standard led cubes
- LED duty cycle 1/8
Update: There is a schematic and part list available here.
WARNING: Do not build this cube unless you know what you are doing! It uses minimal hardware but is difficult to understand.
There is a new design which is much easier to build with a very low part count.
When I had finished my first charlieplexed LED cube (3x3x3) I wondered whether my next project should be a 4x4x4 cube. But at the time I thought it wasn't worth the effort. After all, I had just shown that a charlieplexed cube is possible and that it can be done with reasonable effort.
The 4x4x4 would of course have 64 LEDs, which would mean quite a lot of soldering. And since I would definitely want to use bright wide-angle LEDs, it wouldn't come cheap.
But the idea never really went away and when I found a good offer for a set of 100 suitable blue LEDs I simply couldn't resist.