The Etch A Sketch: famous, creative, and unique. Unfortunately I have no clue where the one from my childhood is, so I decided to make my own virtual one! Check it out (and my awful drawing skills) below.
Step 1: Parts List
Fortunately, the parts required for this project are simple and cheap. You might even have them all!
1 x arduino (any kind of course)
2 x potentiometers (resistance value doesn't matter, mine are 10k ohm)
1 x accelerometer (this is optional, but adds some fun. Mine is only one degree so any will work)
1 x breadboard (not necessarily needed, just makes things easier)
2 x small piece of material approx 5 in by 5 in (wood, cardboard, whatever)
4 x some sort of standoffs for mounting the two pieces of material together
Some lengths of wire to breadboard.
Random tools will also be needed to mount and screw whatever material you're using together.