Stair Tricking Skateboard

June 22, 2012 by Mike Szczys 41 Comments

This skateboard concept lets you travel down stairs almost as smoothly as gliding down a hill. This seems to be the eighth iteration in [PoChih Lai’s] attempts to add functionality to a board which will make it the ultimate ride for an urban outing. Check out the video after the break to see just how well he did.

We’ve seen hand carts that use six wheels to make stairs a breeze using a triad of wheels as a single-wheel replacement. This was actually the main concept early on in the design. But the drawback to this method is that the design takes up a lot of room and [PoChih] also made the deck much bulkier to keep you from getting a foot caught in the mechanism. The final design does away with the end-over-end concept and adopts a rocking mechanism. The board hangs from a bar which serves as the pivot between the two wheels. This way the wheels can absorb the brunt of the motions, and the base of the deck can slide across the fronts of the steps if needs be.

We were talking about this here at the Hackaday office and the point was made that this is like YT’s skateboard from Neal Stephenson’s Snow Crash. Did you hear that it’s headed to a theater near you?

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Revolight Clone

June 20, 2012 by Mike Szczys 13 Comments

[Fabian.E] wanted to light up the rims on his bike, but didn’t want to shell out a bunch of clams to get it done. He came up with this system which uses magnets and reed switches to light up one arc or each bicycle wheel.

He calls it the lightrider and it’s based on the revolights concept. That design uses a microcontroller which is capable of animating patterns when the wheels aren’t spinning. [Fabian’s] version can’t do that, but the effect while moving is basically the same. The ring of LEDs around the rim is connected to a battery via a set of reed switches. When these switches move past a magnet on the fork it completes the circuit and switches on that segment of LEDs. The clip after the break gives a demonstration of the finished product, and includes a fast-motion video of the fabrication process.

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Milling A Motorcycle Engine

June 20, 2012 by Mike Szczys 30 Comments

Real motorcycle enthusiasts design and mill their own engines. Well, perhaps that’s an overstatement. Certainly it takes to more obsession than enthusiasm to go to these lengths. But this gentleman’s modifications started out simple enough, and managed to make it to the most extreme of hardware fabrications.

The used bike came with a modified camshaft that seemed like a botched job. As he got further into tuning up engine performance the prospect of just replacing the entire thing with his own design started to grow. Using a manually operated milling machine he cut his own molds for the new cylinder head out of wood and sent them off to be forged out of aluminum. They come back in rough shape but he just “filed the cast without mercy” and machined the tolerances to his specifications. Apparently the first test ride had him a bit nervous — he also milled his own brakes for the bike. But after a few times around the block he gained confidence with his work.

[Thanks Carlos]

Shake Phone To Start Scooter

June 18, 2012 by Mike Szczys 14 Comments

This scooter starts right up with a shake of your Android device. This shake must be done from front-to-back, because a side-to-side shake is reserved for unlocking the saddle ([Brad] stores his helmet within).

Connectivity is facilitated over Bluetooth, with a rocker switch near the left handle bar to disable the receiver so that you don’t run down the battery. You can see the locking panel hanging open on the front portion of the scooter. Inside he installed the driver board which patches into the ignition system and drives a solenoid for the seat latch. It sounds like the latching mechanism used a bowden cable whose handle was inside that locking panel. By adding a solenoid and generously lubricating the cable he managed to get it functioning from the driver board.

Check out the video after the break for a proper demonstration. The phone is running a Python script via SL4A, which takes care of the user interface.

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Adding The Apple ‘breathing LED’ To A Motorcycle

June 12, 2012 by Brian Benchoff 32 Comments

[spiralbrain] has a beautiful KTM Duke 200 motorcycle, but he’s found the factory configuration is a little bit plain. Wanting to add his own unique touch to his bike, he decided to add a ‘breathing LED’ to the parking light that slowly changes its brightness much like the LED on recent Macs.

From the factory, [spiralbrain]’s bike uses extremely inefficient (and somewhat ugly) T10 lamps for the parking light. This was changed over to a 12 Volt white SMD light bulb, but what really makes this build special is the way [spiralbrain] is controlling this lamp.

[spiralbrain] added a very tiny circuit consisting of an 8-pin microcontroller (a PIC12F683) that slowly dims the new SMD light bulb using the built-in PWM module. When the bike is taken out of neutral, the microcontroller stops at the highest PWM setting so the ‘breathing’ LED function is only engaged when not moving.

It’s an interesting mod that’s sure to draw some attention when [spiralbrain] is showing off his bike. As a bonus, the mod is completely reversible, so the bike’s warranty is still good.

Using Old Phones As An Intercom In Your VW Bus (or Anywhere Else)

June 8, 2012 by Caleb Kraft 68 Comments

In case you haven’t noticed from my many comments on the subject, I drive a VW bus. It is a 1976 Westfalia camper with sage green paint and green plaid upholstery. I absolutely love it and so does the rest of my family. We go for drives in the country as well as camping regularly. We have found that the kids have a hard time communicating with us while we’re going higher speeds. These things aren’t the quietest automobiles in the world. Pushing this bread loaf shaped hunk of steel down the road with an engine that might top out at 75hp results in wind noise, engine noise, and of course, vibration.

I decided to employ a really old hack to put two functional telephones in the bus so my kids can talk to my wife (or whoever the passenger is) without screaming quite so loud. This hack is extremely easy, fairly cheap, and can be done in just a few minutes. The result is a functional intercom that you could use pretty much anywhere!

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Pneumatic Car Launcher Is Actually More Than Just A Hacker’s Fantasy

June 6, 2012 by Mike Szczys 11 Comments

So if you had to launch a car through these goal posts how would you do it? Certainly not with a slingshot (although we might have gone with a steam-powered catapult a-la an aircraft carrier). That maroon car with the white stripe is about to make the flight thanks to a very powerful pneumatic launcher.

We don’t usually attend the demolition derby, so this sort of thing is new to us. And we were even more surprised to find that this isn’t strictly a novelty act. The system is actually how some of the more dangerous automotive stunts are done for the movies. This launch sends the car in a graceful arc that is right on target and reminds us of the cliffhanger stunts from The Dukes of Hazzard (TV, not the recent movie). But if you’re a director looking for a horrific car accident, the rig can be altered to send the car spiraling through the air. Sounds like the record is nearly eight turns while airborne.

We don’t have any extra cars to launch, so we’ll stick to making the confetti fly.

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