The power chapter discusses various batteries and construction of a battery charger. The next chapter discribes seversl drive systems including stepper, dc and servo motors as well as the h-bridge and Pulse Width Modulation. The sensors chapter describes a range of sensors and circuits including the magnetic compass. A bit of fuzzy logic is also included. The remaining chapters cover projects making use of various concepts and mechanisms.
Chapters cover both wheeled and walking moble robots.
One project robot is controlled by speech, another is a radio controlled blimp which carries a CCD TV camera. There is also a simple swimming android fish. The projects are well covered by pictures, schematic diagrams and parts lists. There are also references to many web sites for additional information. Chapter 4 doesn't include the hack which turns a servo motor into a configuration suitable to direct drive wheels.