I've read some online post on shift registers and find out each shift resigster like 74HC164N controls 8 leds, while 3 pins are used on arduino uno. so if i build a 8x8x8 led cube, that would require a total of 72 pins to control them. in this case, i can only use up to 4 shift registers because arduino uno have to give 3 pins to each shiftregister. and 4X8 is only 32 ouputs.
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via Egeo 16