Two stepper motors drive Etch A Sketch knob shafts, and a servo motor flips Etch A Sketch to erase the screen. Using the Arduino IDE’s Serial Monitor the user can automatically generate “random walk” simulations. Material cost about $60, simple construction requires only a couple hours effort.
Not a true random walk simulation since it separately moves random amounts in horizontal and vertical directions; and maximum travel is restricted to remain within Etch A Sketch screen.
Time lapse video took about 30 real time minutes.
Step 1: Procure Hardware:
For the Arduino board, I actually used a Freeduino board, although I initially developed the project using an Arduino Uno board. Both these Ardunio boards can be powered directly from USB.