oomlout has published some fascinating plans for a basic robot. It’s based around an Arduino as well as is a platform similar to the Parallax Boe-Bot. The Arduino sends PWM signals to continuos rotation servos that drive the two primary wheels. all of the structural elements are laser cut from acrylic with slots to hold common hex nuts. It’s an fascinating technique, however the style has a great deal of prospective for improvement. ideal now it utilizes two different power supplies as well as a breadboard for basic connections. From the video below, you can see that the balance might be improved as well.