Zero-Dollar Carbon Fiber Bicycle

Back in January, I was presented with a large carbon fiber tube, in the form of an oar.  Being who I am, I made the obvious decision to build a bicycle frame out of it.  As I found out when building my bamboo bike, making a bicycle frame from scratch, especially when using composites,  is not actually very hard, as long as you have a lot of patience.  To make this project more interesting, more challenging, and cheaper, I built the entire frame and bicycle without spending any money on it.  Every component (except the pedals, which used to live on the bamboo bike) I either made myself or scavenged.

Electric Tricycle

So I built another electric vehicle.  This time around, I actually did some designing before I got any parts, so this was less of a "what do I do with this cool part" project than most of the things I build are.  However, the actual construction of the vehicle was started due to the acquisition of a cool part:  the "melon" sized brushless motor that drives the tricycle.  Getting the motor was a great excuse to implement a bunch of ideas for an electric vehicle I developed after building my electric scooter.

This was my first big project done with access to real machine tools (courtesy of MITERS), so this was both my learn how to machine things and learn how to Solidworks project.  Even with just a semester working with these tools, I was able to make this vehicle significantly more refined (while simultaneously even more ridiculous) than my scooter.

The design for the vehicle was inspired by the classic Radio Flyer tricycle.  That vehicle geometry is not exactly intended for the high speed go-kart like performance I wanted, so I tried to optimize the design while retaining the tiny kids-trike aesthetic.  

And now, a brief overview of the tricycle's specifications:

Motor: Turnigy C80100-130 brushless RC outrunner

Controller: Kelly KBS48121 120A peak BLDC controller

Batteries: 39.6V 7.5 Ah A123 Systems Lithium Nanophosphate pack

Drivetrain: Manual 8-Speed Shimano internal gear hub, custom spur gear differential

Chassis: Welded steel tubing and aluminum plate construction with side-to-side leaning

Top Speed: 45+ mph, if you're feeling brave

More pictures, videos, and build log can be found after the break.

Autonomous Anti-Mouse Sentry Turret

For Bad Ideas I built a computer controlled anti-mouse sentry turret.  The turret uses a video feed from a webcam and a slightly modified version of the Project Sentry Gun Processing code to track mouse-sized objects that move across the camera's field of view.  It fires at the objects using a hacked electric airsoft gun on a pan/tilt servo platform.

Motorized Projector Screen

After the winter break, I brought a projector I got from old high school's recycling pile back to my dorm with me.   I made a screen for the projector from some blackout fabric, and motorized the raising and lowering of the screen with a small gear motor and some other parts I found.

PocketBoard

PocketBoard is a 14.5" long skateboard designed to be the opposite of my electric scooter: It is a small, simple and reliable vehicle for going short distances quickly.  At roughly 5% the weight of the scooter and some small fraction of the volume, I can easily store it in a backpack or even my laptop bag when I'm not riding it.  It has a solid oak deck with inlayed aluminum plates, and (what I assume to be) standard skateboard trucks, along with some soft 60mm diameter wheels.

PocketBoard V2 keeps the same shape and footprint, but has an aluminum deck made from the side panel of a PowerMac G5 case.

PocketBoard's rather short build thread can be found here.

Monitor Arm

By a combination of luck and keeping a close eye on the reuse mailing list, I have acquired a pair of nice, large computer monitors: A 24" 1920 x 1200 SyncMaster 245BW and a 25" 1920 x 1080 HP 2509m.  Both screens were easily repaired by replacing dead capacitors on their power supply and inverter boards.  Due to the small size of the stock dorm room desks, the two monitors plus my laptop could not actually fit on my desk with space left for anything else, so I built a monitor arm that bolts to my loft out of some 80/20 extrusion.

Nyan Hat

I present Nyan Hat, possibly my silliest and most useless project yet.  Nyan Hat was spawned from a late-night discussion involving at various times Halloween, hats, and Nyan Cat, and went from idea to completion in just over two weeks.