About Lenore

Co-founder of Evil Mad Scientist Laboratories

BAMF 2014: Racing Snail video from Hackaday

Part of our continuing coverage of highlights from the 2014 Bay Area Maker Faire.

Mike from hackaday caught up with me at Maker Faire and got a bit of video of my racing snail, which I was showing as an example of soft circuitry alongside various projects of our friend Meredith, including her awesome StarBoard flexible circuit LEDs. Mike’s writeup points to the history and variety of Bristlebot projects. The racing snail is a personal favorite, with the nap of the fabric foot providing the direction to the bot’s motion.

A velvet bristlebot racing snail

EE Times Interview on Open Source Hardware

Windell and Lenore and Three Fives kits

Photo by Rick Merrit, EE Times

EE Times came by and interviewed Windell in advance of his upcoming Maker Faire talk about best practices for Open Source Hardware.

…Big semiconductor companies are jumping on the bandwagon of open source reference boards. But their chips’ intellectual property remains carefully guarded corporate crown jewels. …

Maker Faire Bingo

With Maker Faire coming up next week, @techninja42 suggested that Maker Faire Bingo would be a great way to get ready! With the help of some friends, he put together a site where you can grab a bingo card to play during your visit to Maker Faire. We tried it out with the WaterColorBot, but you can use your preferred automated printing method to make your own, or maybe even find a robot at Maker Faire to draw it for the ultimate Maker Faire Bingo!

Send your maker bingo suggestions to @mfbingo for inclusion in the bingo card generator.

Stealth Fighter Guitar with Octolively Lighting Effects

Stealth plane guitar with octolively lighting

Herb wrote in to say:

When I saw your Octolively LED circuit, the first thing I wanted to do was incorporate it into our electric guitar project.

I teach a basic senior physics class for non-science majors and wanted to try something different; a year-long design project.

We made a guitar from scratch that resembles a stealth fighter. We even wound the humbucker coils in the guitar… Your circuit is used to drive the exhaust lights in response to playing motion…It works well and offers a unique visual effect based on the selected setting…you can even hear the circuit through the amplifier when it drives the blue LEDs…

The Octolively is wired up with the LEDs pointing down from the bottom of the guitar (back of the plane) and the sensors pointing toward the neck to respond the motion of the guitar player.

Stealth Octolively guitar in progress

His student, David, added:

Thank you for making such a great educational product to learn about LED’s and simple circuits. Our class worked together to put all of the parts in the correct place and it was a wonderful collaborative learning project.

Octolively assembly for incorporation into guitar

StippleGen and a low-power DIY laser cutter

Jens demonstrates using StippleGen2 with his low-power (300 mW!) DIY laser cutter and a classic image of Louis Armstrong.

After letting StippleGen2 crunch the numbers for a while I imported the resulting vector graphic file into inkscape and generated the G-code so that I could use my laser cutter to cut the image into a black paper. 2 hours and 23 minutes later I had a 20×20 cm piece of paper with about a 1000 holes in it and it looks awesome! Would be perfect for a lamp shade or just nice to put up in a window and let the sun shine through. I can highly recommend StippleGen2 it’s super easy and a lot of fun.

From the Mailbag: Understanding the Homopolar Motor

Wes wrote in to say:

I am an Electrical Engineer (graduated May ’72, Texas Tech U), but I never saw or even heard of a homopolar motor until last week, when I saw an electric motor made from four parts on National Geographic’s program, “None of the Above“. When I first saw it, I figured it must be a hoax. A DC motor had to have a commutator and two magnets.

Only when I was browsing around in Wikipedia did I find an article on the motor. I happened to have everything I needed, so I built one, not really expecting it to work. To my great surprise, it spun up to a few thousand RPMs in seconds. I read Wikipedia’s theory of operation, but it didn’t make sense. Today, I came across your wonderfully clear and simple explanation, and now I understand the motor perfectly.

I simply cannot thank you enough for your drawing and explanation.

Thanks for writing in— we’re glad to hear you enjoyed learning something new! The instructions for making the motor and the discussion of how it works are in our articles: