Popolino is gaining shape. After a couple of obstacles, found while working with Arduino Duemilanove - not enough timers to run the DC motors and the servo at the same time - This small bot is now ready to roll.
I finally managed to put everything together: the Arduino, the Ardumoto and the RP5 platform. It was like plug&play. But as can be seen in the movie, it lacks "intelligence". The next step is to give it the "power of sight".