Custom Mini Sumo robot
Forum user DrGFreeman has been posting about his custom Mini Sumo robot. He designed the chassis in CAD and 3D printed it; the model is available on Thingiverse. An A-Star 32U4 robot controller reads the QTR-1RC reflectance and Sharp GP2Y0A60SZLF analog distance sensors while powering the motors with its dual onboard motor drivers. DrGFreeman plans to build two copies of the robot: one with 75:1 micro metal gearmotors and one with 50:1 micro metal gearmotors so he can pit them against each other and figure out whether more speed or torque does better. This video shows the behavior he’s programmed so far:
The whole build log along with more pictures and discussion is in the forum post.