[Alan Anderson]

You can "cheat" a little and use only two PWM cables. One of them will have the black and white wires for ground and one signal, with the red +5 unused. The other will carry the remaining three signals, and plug into the Robot Controller "sideways" across where the white pin of three connectors would usually go.

If we use the IR detector board, I intend to make a small "wiring concentrator" board to go next to it. All the digital input and power connections will go to that board, which will have a ribbon cable connector to bring all the signals to the matching connector on the IR board.