Fully-automatic Crossbow

December 8, 2009 by Mike Szczys 53 Comments

[youtube=http://www.youtube.com/watch?v=QS4RKoRyTik]

We received an excited email from [Noah] regarding a gentleman who works with crossbows and crossbow pistols. Begrudgingly, we took a look and what we saw made our day. [TheDuckman666] must have an insatiable love for all things crossbow. His webpage has details and pictures covering seven different models that he built. His YouTube channel shows off three more models, all with magazines for multiple bolts.

Seeing the electrically-cocked, automatic projectile launchers wets our appetite, but we do wish there was more background info about the build process.

(Remote Controlled Robot) Car Vs (solar Charged) Tank

December 5, 2009 by Jakob Griffith 8 Comments

[youtube http://www.youtube.com/watch?v=WKFECpQ8asI%5D

[Matthias] sent in his team’s iPhone Robot (CAR) project in response to yesterday’s iPhone controlled solar charged tank. Unlike the tank, the iPhone car is controlled via Bluetooth BTnode and BTstack, and also isn’t solar-powered. However, both projects utilize iPhones and readily available components. We particularly liked how it not only used a multi-touch input, but also the accelerometer within the iPhone. It seems some competition is stirring, lets see who wins out.

Eureqa Discovers Equations

December 4, 2009 by Gerrit Coetzee 35 Comments

While “Software to discover equations and mathematical relationships in data” isn’t at the top of our christmas wish list, we have to admit that Eureqa is pretty cool. Developed at Cornell University, Eureqa uses machine learning algorithms to determine the underlying math behind data sets. It derived Newton’s second law of motion in a few hours on a standard desktop computer, which isn’t bad at all for a cold unfeeling robot mind. There probably aren’t many applications for this in most hacks, but what hacker wouldn’t want Sir Issac Newton’s brain in their toolbox? The software can be downloaded for free from their website.

[Via Wired]

Make A Mac On The Cheap

December 3, 2009 by Jakob Griffith 25 Comments

We’re not usually the type for PC case mods, but when we received the tip for the Macbook Mod of hiding a Macbook inside of two Linksys routers, we decided to make an exception on three accounts. [Tyler’s] original intent was acquiring a Mac, the total price for a full functioning system was a little over $200, and Macs aren’t PCs.

[Thanks Bluewraith]

But what if you want the mac experience and not the nitty gritty hassle of fixing logic boards, searching for long lost components, and modding a case? Then buy a Mac you might like [Useless Ninjas’] super cheap modification of an MSI Wind into Leopard running brute for only $240.

[Thanks Flyordie2]

McLVDT: A Straw-based Sensor

December 1, 2009 by Mike Szczys 13 Comments

We saw [Kevin’s] home-built Linear Variable Differential Transformer in a YouTube video last week and wanted to know more. We’re in luck, he agreed to share all the details as well as a bunch of information on these sensors. An LVDT is used to measure distance along a straight path. Unlike a linear optical encoder, this method uses measurements of inductance between two electrical coils to judge the distance.

[Kevin] used some magnet wire wrapped around two straws of different diameter to fabricate his sensor. A signal generator is connected to the primary coil and the resulting signal induced in the secondary coil is measured to reveal the change in physical position. Check out the video after the break to see the results.

It’s not hard to get your hands on a McDonald’s straw (hence the name ‘Mc’LVDT), a smaller inner straw, and a few feet of magnet wire. This will be a fun one to try when those dark winter days start to get to you.

Continue reading “McLVDT: A Straw-based Sensor” →

NXT Turing Machine

November 30, 2009 by Jake W 20 Comments

[youtube=http://www.youtube.com/watch?v=cYw2ewoO6c4]

This interesting use of Lego popped up on the mailing list of the University of Bergen. Build by a group of Norwegian Danish students, it’s a simple computer that implements Alan Turing’s design from 1937. Having both read and write functions, it implements its own (somewhat inefficient) medium of non-volatile memory. What we find interesting is that rather than move the ‘tape’ through the machine, the machine rolls over the tape. Thanks to [Thorsten] for the tip.

Complete The Maze, Get A Gumball

November 19, 2009 by Caleb Kraft 21 Comments

[youtube=http://www.youtube.com/watch?v=kcj9Sdiohog&w=470]

This neat accelerometer controlled marble maze adds a level of fun to retrieving a gum ball. You have to first navigate the maze using a controller that has a dual axis accelerometer in it to control the angle of the platform. Though that does look like a wii accessory, there is no wiimote in there. Only after you have completed it will the gum ball machine dispense the candy. [Dan] constructed everything himself, which might explain the lack of “pits” for the marble to fall into in the maze.

More details on the build and source code are available on his page.

[via hacked gadgets]