Hi Paolo, in the control
Hi Paolo, in the control board I added the motor control driver (Toshiba TB6612FNG in this case, but you can do it with a cheaper L293D as well) and few connectors that help having cables (almost) in order.
Also added a couple of Capacitor to filter electric noise out since I use the same unregulated power supply for both logic and motors/servos.
There´s nothing else and you can make one by following your motor driver of choice diagram.
I chose to add it as a separate board and not a shield to keep max extensibility on the bot, but you can merge this some other functionality in a shield format.
Hope this helps, let me know otherwise!