1.) this would be more STRIP related than 'MATRIX/CUBE'.... (for the project/demo).. does that matter? same principle applies?
I didnt see any mention of shift registers?
1 I/O pin per 2 leds doesnt seem very 'convenient??
what if the LEDS used need/require more than only 8mA?
4 arduino outputs go to current limit resistors to the 4 anodes. Values selected so that 8mA can flow.4 arduino outputs go to the cathodes.
is that referred to as 'matrix style'?