This small inexpensive plotting system uses two servos and a mechanical linkage to doodle. The drawing stylus can reach a curved diamond shape and can adapt to plot with a pen or other interesting materials. It is a low resolution system that can be built with hand tools and inexpensive off-the-shelf parts. This project is part of The Robot Group projects.
Web site: http://wiki.therobotgroup.org/wiki/Mini_Sand_Draw
Gray Mack
Gray is a software developer by trade. His hobbies include drawing, electronics, robotics, and electro-artistic displays.