A bike light

JONATHAN BOBROW, graduate, MIT Media Lab; cofounder, Move28, i nteract i ve t oy design fi r m, Queens, New York

We sent Bobrow, a programmer and designer who invented Troxes origami building blocks, shopping with the equivalent of R1 000 and a challenge: build something. He came up with this novel bike light whose switch mounts to your handlebars.

MATERIALS

3 m EL wire (red) one EL wire battery pack two AA batteries 15 m 24-gauge speaker wire one large button heat-shrink

TOOLS

soldering gun heat gun 3D printer

First make a body for your “neon sign”: a 3Dprinted block with grooves to hold the electroluminescent wire in the shape of your letters. You can design your own, or download mine at jonbobrow.com/popmech. Commercial 3D printing services shouldn’t be hard to find; some are available at maker community venues in some bigger centres.

Press the EL wire into the base’s channels. Cover the parts of the wire behind the body with heat-shrink. You can also black out portions of the front this way, say, to separate words. Trim excess wire before plugging it into the battery pack.

Cut a length of speaker wire to run along the frame of the bike from the handlebars to where the battery pack will sit by the seat. Solder it to the button. Open the battery pack and find the contacts for the pack’s built-in button. Solder the free ends of the speaker wire to these contacts, bypassing that button. Put heat-shrink tubing over the exposed wire to make a clean and weather-resistant connection.

Use zip ties to mount the button to the handlebars and the sign below your seat. PM