Etch-a-Sketches always seem like a fun pastime until you try to actually draw with one. One mistake and you wonder why you're even bothering trying to draw with one instead of using anything else. However, someone has removed the frustration of using an Etch-a-Sketch by wiring one up to a Raspberry Pi. Best of all, you don't even need to turn the dials; just give the Raspberry Pi an image to draw and it will do all the work for you without accidentally shaking the canvas.
Source: xda-developers.com