Okay, the title lies. It’s not really a robot (and it’s not only built with a hanger), it’s a little one-motor walking machine (no sensors, no feedback), but the project does teach you about basic breadboarding, soldering, use of the BEAM Bicore control circuit, how to hack a servo motor, and other deep geek mojo you can apply to building actual bots.
This is a version of the project that was in my book, Absolute Beginner’s Guide to Building Robots, and pictured in Make Vol. 6 and on the issue’s Web page. The illustrations were done by Boing Boing’s Mark Frauenfelder and the photos are by Street Tech’s court photographer Jay Townsend.