[Greg Zumwalt] nailed it with his “Marblevator Line Follower.” Roboticists will ... Inside the cylinder is a battery, charging circuit, inductive receiving coil, and a motor turning a magnet ...

There’s hardly a day that passes without an Arduino ... line follower. You’ve probably seen “bang-bang” line followers that just use a photocell to turn the robot one way or the other.

But a company called ArcBotics has created an Arduino-based robot called "Sparki" that ... tutorials will start with "edge avoidance, line following, maze solving, wall avoidance, room navigation ...