2. The electronics.

Let's take a look at the schematic: 

Seeker II Autonomous Mini Sumo

Seeker II is my next-generation stealth mini-sumo. It is under 10 cm x 10 cm in its normal start position. It is 1.5" high, and weighs in at almost exactly 500 grams. And it is fast, very very fast :-)

Specifications:

• Microchip PIC 16F876, running code written with the CCS C compiler
• TI SN754410 h-bridge
• National LM2940 5-volt regulator
• dual NiMh 9-volt battery supplies, with separate switches for the motors and the electronics.
• Faulhaber 1717 gearmotors with Micromo 76:1 gearheads
• dual Sharp GP2D12 analog range-finder sensors
• dual Fairchild QRD-1114 edge sensors
• all parts custom machined from delrin, aluminum, and brass (by me)
• sticky molded poly-urethane tires on custom machined wheels -- I got the mixture from my brother, and he has an excellent page about it here. The mold was made by my friend Tom Light.

Here's a small movie (119 KB) of Seeker II trashing Drone. This was before I had the shell done, and when Seeker II weighed in 200 grams lighter than Drone.