I am planning to build a robot that can sketch a square autonomously. We are going to use an etch-a-sketch, motors, metal, gears, a controller, and programming to make the robot work.
Sketch
The robot consists of a chassis with 2 motors, 2 small gears, 2 larger gear attached with metal, metal bars to screw the parts on.
The programming is used to tell the controller to turn the motors so that it draws a square on its own.