4x4x4 Light Cube Shield Kit for pcDuino/A-r-d-u-i-n-o 4x4x4 Light Cube Shield Kit for pcDuino/Arduino Bend LED's Cathode leg (the shoter one) Divide LEDs into 4 layers, connect all cathode legs within the same layer Connect Anode legs between layers Finally connect anode legs of different layers to the shield.