Arudino software for four arrays of LEDs, set to sink current from an external source.

Pin usage:: Pin 6: PWM output; 0 - fully on; 255 - fully off (top face) Pin 9: PWM output; 0 - fully on; 255 - fully off (right face) Pin 10: PWM output; 0 - fully on; 255 - fully off (bottom face) Pin 11: PWM output; 0 - fully on; 255 - fully off (left face)