Assemble a TurtleBot

This guide will show you how to assemble a TurtleBot once you have built or obtained all the parts necessary. There are guides next to this one which show how to make most of the parts. Sources for all the parts and kits of various levels are listed at Read more »

$30 Gobo Arm: Mobile Document Camera Stand

If you’re familiar with tabletop product photography and video, you know what a pain it can be to shoot overhead shots while working on your subject. Tripods just get in the way. The usual remedy is a document camera, the modern equivalent of the overhead projector. These cameras let you... Read more »

Lunchbox Laser Shows

Back in the 1970s, my friend Wayne Gillis and I used to do light shows at science fiction conventions. We had the usual panoply of overhead, slide, and custom-made projectors, and a single, very expensive, helium-neon laser from Edmund Scientific. Calling ourselves Light Opera, and later, Illuminatus, we performed at... Read more »