Computer Mouse Robot
non-rotating ball for third "wheel".
bottom of Mouse showing "wheels" attached to motors
This was my first computer mouse robot.  I used toy motors that spun quickly and a ball at the back (non-moving) that created some friction on the linoleum.  Maybe too much because the wheels I used were just small beads on the end of the motor shaft.  Used a too big lithium battery.  A previous version "mousemotor1" used a 9v lithium battery which was even bigger.