MSE-5: The Weekend Project That Wasn’t

An elaborate but small hand-assembled BEAM style robot with carefullly coordinated colors in blue and white.

All parts are from RadioShack. Photo ca. August, 2012.

This is a Herbie-style BEAM photovore with a reversing relay. But instead of a bump switch, the “retreat” reflex is triggered by a sharp, loud sound like a clap. It was developed for MAKE’s RadioShack “Weekend Projects” campaign in the summer of 2012; the prompt specified a project that responded to both light and sound. “MSE” was intended to nod at “Mousey the Junkbot,” Gareth Branwyn’s famous Herbie-style build from “The Absolute Beginner’s Guide to Building Robots” (and MAKE Vol 06). MSE-5 was by most standards a failure, coming in three weeks past deadline and well over budget due to persistent line noise problems that would cause the reversing relay to trigger over and over again. I did eventually iron out the bugs, but the final build was much too complicated and never saw use. Still, the finished ‘bot turned out pretty sharp-looking, and I learned a heckuva lot about electronics in a very short time.

Though I can’t necessarily recommend that anyone should build it as-written, a complete PDF of the unpublished Make: Projects MSE-5 tutorial is available at the link below.

MSE-5: A Light- and Sound-Sensing Robot

OCD Bristlebot

A yellow toothbrush head, with white bristles, that's been cut from the handle. The bristles are on the ground, and there's a layer of foam tape on the back of the head securing a small piece of black phenolic board that matches the shape of the head.  On top of the phenolic board are a small pager motor, mounted in fuse clips, a toggle switch, and a CR2032 coin cell battery holder with a battery inside it.

Plastic toothbrush head, fuse clips, pager motor, toggle switch, copper-clad board, double-stick tape, coin cell and holder.

I made this little robot sometime in mid-2014. The motor case, fuse clips, and most of the underside copper layer are grounded, with small “islands” manually cut clear to carry Vcc. The sides and top of the phenolic board are stained black with Sharpie marker, and the foam tape provides a solid interface with a bit of give to accommodate the underside solder points. The toothbrush belonged to my grandmother; I found it in a travel kit in a piece of very old luggage.