My 3x3x3 and 5x5x5 LED cube

Using Arduino LEDs and Multiplexing
44

5x5x5 cube looks good!

I still dont understand the need for transistors for the grounds. When I want to ground a layer I just send a LOW signal to that layer. When I want to turn the layer off I send a HIGH to the layer. A 5V HIGH shouldn't be enough voltage to reverse bias the led so it shouldn't hurt it.

I may be wrong :astonished:

Thanks!