I have been looking for charlieplexing LED cubes again and again. So far I have only found 4x4x4 RGB cubes where charlieplexing is used for the 3 colors of a vertical group of max 4 RGB LEDs. But I would like to build a cube with one color and charlieplexing.
I understand the principle of charlieplexing and multiplexing and once the cube is in place I know how to program it. So I am just looking for someone who has a layout for a charlieplexing cube 8x8x8 single color.
What's the largest cube you have built so far, was it single colour or RGB, and how did you control and multiplex it?
4 * 4 * 4 = 64 need 16 pin
8 * 8 * 8 = 512 need 46 pin
and in any moment of time will light only 1 single LED from this 512
So far, I have made a single-color 8x8x8 cube, where each layer's anode or cathode (I can't remember which I did) is connected, and then each vertical column of connections goes to a separate pin on an IC. I used 10 microchips: 1 STC controller, 1 chip (8 Bit) for the 8 layers, and 8 shift registers (8 bit) for each vertical slice.
At the moment, I am working on an 8x8x8 RGB cube using addressable LEDs.
Ok, that's good. I was expecting you say this new cube would be your first.
It's very common that we get beginners here with crazy high confidence in their abilities and determination, thinking they can run a competitive marathon before they can even walk!
I have seen a 4x4x4 cube that used charlieplexing, but not an 8x8x8. I will try to find a link to that.
EDIT: think this is it:
thanks for the link. I tried to build something in a circuit board design program but got confused. But now I may have seen a way to make it bigger than 4x4x4. I'll try it later when I have time
Good luck and please let us know what you come up with.
Keving Durrah has written about controlling individual brightness on LED cubes.
And... LED 8x8x8 is all over the internet.
I will. At the moment I have some Pesonal stuff to do but I will try to not take to long
The Thing is, the Cube I want to make will use charlieplexing. That is way make complex the the typical led cube
I still do not fully understand the words used to describe "Charlieplexing"... but, I am not a good learner... I think it as just biasing LEDs differently.
Here is a simulation controlling twenty-seven LEDs with nine pins... theory says I can light 72 LEDs. I could not make the 4x4x4 work in the simulator.
Do it. I will be interested in your methods.
Matrixing reduces LED brightness. If you matrix 512 LEDs, then the average current through a 20mA LED will be 20/512 = 39uA. Do you think that's enough to see the LEDs.
Maybe try eight separate 8*8 layers.
Leo..
Me neither... so I made a not-so-cubic 1x1x4 RGB cube using Charlieplexing...
I drew my concept that I had from here
First I built the Charlieplexing matrix and divided it into the layers I need. This is not the smallest possible. Here I have 25x25 so 600 LEDs. 24x24 so 552 would be the smallest possible but that would make the division very difficult
The bottom right corner would be the 9th layer so this can be removed
Then I moved everything together
I haven't thought about how this could be physically constructed yet
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