There's a ton of background info here: http://rasterweb.net/raster/projects/arcomatic/
The Milwaukee Makerspace took part in Spring Gallery Night 2012 and I needed something new to show, so I built this simple Arduino-based drawing machine.
It consists of two servo motors and an arm to hold a Sharpie marker. It's really that simple. The hardest part was the programming, but with all the art robots I work on, that's sort of the exciting part, and it can change each time.
Below I'll post updates to this project as they happen.
I'm currently writing new code, as the original code was a bit sloppy. There's math involved. I find math a bit confusing.
After the initial run of the Arc-O-Matic it was partially destroyed by gravity and a cat. We've taken the rebuilding opportunity to improve things, primarily by replacing the glue and tape with 3D printed plastic parts. There's a bit more info on it here: http://rasterweb.net/raster/2012/07/12/a-new-elbow/