I am creating the new robots, after the prototype had good results. I was afraid I could not use the l293e driver with the lower voltage (3.3V) arduino fio, as the specs of that IC states that the minimum logic supply is 4.5V. Nevertheless I was able make them work with a 3.3V logic and a motor supply from lipo batteries rated at 3.7V.
Now I am creating the motor driver shields for the arduino and after that I will modify the car chassis to integrate with the electronics.
