I have put my other RGB LED Cube project down for a minute, to explore this clean and simple design. It is compose of nothing but LEDs and a microcontroller, thats right folks NO current limiting devices on the LED (well... except for the arduino...)
I have built one, and to my surprise, it doesnt suck. I need to build a few more cubes to compare them all (one with shift registers/resistors, one with constant current drivers). The charliecube doesnt seem to use PWM in the standard sense, but it does seem to mix the colors to some degree.
Here is Asher Glicks website about it:http://aglick.com/charliecube.html
Heres is a video of the cube running:https://www.youtube.com/watch?v=L9Wt1Lhbs8Y&list=UUz9z1xiGg70J6bT0tksUb-A
Here i a playlist of some videos about making a charlieplexed RGB LED spire. https://www.youtube.com/playlist?list=PLdZBJjXariL0_9H-2i_l2qmOFxxxmzBBA&feature=view_all
Have you made one of these? share with us what you learned.
Do you want to make one of these? I can help you.
Im currently working on my second cube, so hopefully i will have some improvements over the first one.
I havnt built one, but I have come up with a coulpe ways to make an 8x8x8 charliecube. Im still undecided if im willing to risk 512 LEDs and the amount of time/effort to test them out.
The basics of the design is to rotate the LED 90 degrees between each LED, but the results are a an LED cube made out of nothing but LEDs. a very impressive feat, if you ask me.