Here is another Raspberry Pi project worth trying. Etch-A-Snap is a Pi powered Etch-A-Sketch camera that snaps photos like any other camera but outputs them by drawing to a Pocket Etch-A-Sketch screen. Photos are processed down to 240×144 pixel 1-bit drawings with Pillow & OpenCV before getting translated into plotter commands.
More gadgets like this: here
The Etch-A-Sketch wheels are driven by 5V stepper motors mounted into the 3D printed frame. This is completely portable and powered by batteries.
Etch-A-Snap — A Raspberry Pi powered Etch-A-Sketch Camera
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