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Homemade self-balancing unicycle uses an Arduino to keep upright
On the whim of a coin flip, Nick Thatcher once decided between building a homemade Segway, or a self balancing unicycle. Even though the powers of fate chose the former, Thatcher's thirst to build wasn't quenched -- he built the one-wheeled scooter anyway. The Raptor looks a lot like a Ryno unicycle built from spare parts -- a chain driven wheelbarrow wheel powered by a 350w geared motor, a pair of batteries wired in series, some PVC and polycarbonate, an IMU gyro and an Arduino UNO -- all hobbled together to form a one-wheeled electric mount. Thatcher says the scooter can push 10mph safely, but faster speeds tend to outpace the gyro's corrective efforts. Still, the bike promises between 90-120 minutes of face-plant free fun, provided the rider is at least a little balanced. The motorized unicycle isn't for sale, but peek on over to Thatch Industries for a parts list, or scoot on past the break to see the bike in action.
RepRap prints transistors, but fabs have little to fear
Budding hobbyists almost have it too easy these days, what with all the ready-made components, Mindstorms and Arduino boards, but there's still a couple of folks out there kicking it old-school... and printing transistors at home. Yes, that's a RepRap 3D printer you see there, with a MakerBot Unicorn pen head, depositing tiny dots of silver ink to form intricate rows of tiny electrodes. Sadly, the printer doesn't currently automate the entire process, as you'll also need to separately apply a dielectric material and a host of chemicals to get a working field effect transistor from scratch, but once the basic process is perfected the possibilities, as they say, are endless. Now if you'll excuse us, we've got a hot date with some vacuum tubes. Find the basic formula for DIY transistors at our source link.
The not-so-portable portable GameCube
Ben Hartland's so-called handheld GameCube here isn't quite in the same league as the homebrew wonders from that other Ben, our hero Ben Heckendorn, (though really, what is?) but we've still gotta give him a few points for effort. Unfortunately, the biggest drawback is that it just ain't all that portable, basically consisting of a full-size GameCube console stuck on an over-sized but well-engineered controller and screen -- and made even less portable by the fact that you still have to plug it in. If you can live with that, following Ben's lead should cost ya about $370.[Via Joystiq]
