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I have attached some images of my first robot. It is built around a pololu round chassis, tamiya twin motor gearbox, and tamiya off road wheels along with a ball caster (also made by tamiya). There is a second deck made from some blue HIPS, and it runs off of 4 AAs and a 9v battery. The "brains" are simply an atmega8 and an L293d along with supporting circuitry. I aim to make this into a sumo and line following robot, however I wanted baseline electronics, chassis and control code to start ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/dave-the-differentially-driven-two-wheeled-robot