Stripping Kindle DRM With Lego

September 9, 2013 by Brian Benchoff 75 Comments

DRM

Consider a book sitting on a shelf. You can lend it out to a friend, you don’t need a special device to read it, and if you are so inclined, you can photocopy it. This isn’t true with Kindle eBooks that place severe restrictions on what you can do with a book via DRM. Although it is possible to strip eBook DRM with a few programs on your computer, [Peter] came up with a fool-proof way that’s an amateur engineering marvel. He’s turning Kindle eBooks into plain text using Lego.

[Peter] is using a few bits of a Lego NTX system to press the, ‘next page’ button on his Kindle, then smash the space bar on his Mac to take a picture. These pictures are then sent to a cloud-based text recognition service. After a few hours of listening to plastic gears grinding, [Peter] has a copy of his eBook in plain text format sitting in his computer.

As impractical as it looks, using a robot, camera, and OCR is actually a really, really good way to turn eBooks plagued with DRM into a text file. Even if Amazon updates their DRM to make the current software cracking methods break, [Peter] will always have his Lego robot ready to scan a few hundred pages of text at a time.

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Jeep Dashboard Display Turned Into A Desk Clock

September 9, 2013 by Mike Szczys 16 Comments

This display is easily recognizable by the buttons and the outline of a vehicle to the left. It’s a Vehicle Information Center (VIC) from a Jeep Grand Cherokee. [Florlayamp] discovered a row of the vehicles in a junkyard, all with the displays still intact. He grabbed one and turned the VIC into a desk clock. What would you pay for such a fine piece of used electronic hardware? How about six bucks? Yeah!

Getting it running couldn’t be simpler. It’s all set up to be programmed and run on it’s own. A bit of searching around turned up a schematic to figure out which wires are for power. It took some time to figure it out, but the thing draws about 2A so finding a worthy wall wart was a must.

Now that he was sure it would work [Florlayamp] started on the case build. It’s poplar with quarter round to frame the display. On the back you’ll find a single rocker switch.

Usually we see the opposite of this, adding displays to the dashboard instead of salvaging them.

An RTL-SDR Spectrum Analyzer

September 9, 2013 by Brian Benchoff 15 Comments

With the combination of small, powerful, and pocketable computers and cheap, off-the-shelf software defined radio receivers, it was only a matter of time before someone built a homebrew spectrum analyzer with these ingredients. This great build is the project of [Stephen Ong] and he’s even released all the softwares for you to build this on your own.

The two main components of this build are a BeagleBone Black and its 7″ Touchscreen cape. The BeagleBone is running Angstrom Linux, a blazingly fast Linux distro for small embedded devices. The radio hardware consists of only a USB TV tuner supported by RTL-SDR. In his demo video, [Stephen] shows off his project and by all accounts it is remarkable, with a UI better than most desktop-oriented SDR software suites.

You can grab the BeagleBone image [Stephen] is using over on his blog, but for more enterprising reader, he’s also put up the source of his ViewRF software up on GitHub.

Handmade Stainless Steel Chainmail

September 9, 2013 by Mike Szczys 57 Comments

stainless-steel-chainmail

We know that armor making is an art form. We know it. Still… it’s really easy to let yourself think that making a chain mail shirt is easy after seeing the skills [KdogCrusader] throws down in this build. His hauberk isn’t quite finished yet, though we don’t blame him from wanting to show off the work having put so much into it.

The process starts with fifty pounds of stainless steel wire. That’s the coil suspended on a rod in the upper left. It’s fed into his hacked together coiling jig where it is wound into coils that set the diameter of the rings (think long springs that aren’t springy). Coils are cut along one side resulting in that mountain of individual rings. From there it’s a matter of interlinking all of the rings. He cut apart an old T-shirt to use as a pattern during the assembly. So far the front and the back are only connected at the shoulders as he has yet to add sleeves and finish the sides.

[via Reddit]

3D Printed Prosthetic Hand

September 9, 2013 by Brian Benchoff 17 Comments

hand

3D printing – with the promise of low-scale manufacturing and custom parts – is ideal for the prosthetic industry, but so far prosthetic hands have been a very, very hard nut to crack. [Joel] has been working on the Open Hands Project, a project that aims to make robotic prosthetics accessible to makers, researchers, and amputees alike.

Even though the mechanisms inside the hand are fairly simple – DC gear motors retracting steel cable ‘tendons’ – [Joel] was able to pack all this equipment into a very small volume that isn’t much bigger than real, meat-based hands. To actuate the mechanical muscles in the hand, the user simply flexes a few muscles in their forearm. These electrical signals are picked up by a suite of custom electronics and tell the Open Hand what to do

In [Joel]’s Indiegogo video, he goes over what makes his robohands work with a little help from [Liam Corbett], hand amputee. Aesthetically, the Open Hand is a big improvement over [Liam]’s two-pronged hook, and with the dexterity demonstrated in the video, possibly a lot more capable.

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Hackaday Links: September 8, 2013

September 8, 2013 by Mike Szczys 16 Comments

“I’m sorry Dave, I’m afraid I can’t open the dorm room door.” Does your dorm room have a peephole? Take [pjensen’s] lead and turn it into a mini HAL 9000 using a red LED.

Mix a little work in with your hobby skills. [Vittore] needed to build a video looper to drive some TV screens for a Hotel contract job. He grabbed a Raspberry Pi and got to work. The final product (translated) even uses a shared folder on the hotel’s network as the source slides.

We’re not sure if anyone noticed last Monday (it was Labor Day in the U.S.). We had a little fun with coffee themed posts. [Tom] wrote in to remind us about the HTCPCP: Hyper Text Coffee Pot Control Protocol. If you don’t have time to read it all, he suggests you don’t miss his favorite, error code 418.

Maybe funny reading isn’t your thing right now, but we have some more helpful stuff to offer. Check out [John Chandler’s] Commandments for using PIC microcontrollers from a few years back.

[Andy] has some old smart phones which he is using in his projects. His beef with the touchscreens is that there’s no tactile feedback. Since these are going to be dedicated displays he’s outlining the touch controls with tape to let your finger know what it’s doing.

If you’re living in your first home in America there’s a really good chance it’s a 1950’s ranch house considering how many of them were built after World War II. Bring its infrastructure into the information age with a cable retrofit. [Andrew Rossignol] just did so and posted a lot of pictures of the process.

If you liked [Ken Shirriff’s] post about the Sinclair Scientific Calculator we think you’ll love his continuation of a Z80 reverse engineering series.

Use Your New-timey Printer To Make An Old-timey Camera

September 8, 2013 by Mike Szczys 6 Comments

3d-printed-pinhole-camera

Here’s something to show people who don’t realize the power of 3D printing. This pinhole camera has one moving part which reveals the pinhole, letting in light to expose the 4×5 film inside.

It’s a near perfect roundup of all the qualities a 3D printer has to offer. The build centers around a 4×5 film holder which can be acquired used or as surplus. This drives home the concept of having the power to replace parts (in this case the entire camera) that fit with existing pieces (the film holder). The picture above is big enough that you can see the layers on the pyramid shape, but the structural pieces around the frame also let the uninitiated see that you can print more than just solid blocks. And finally, since it’s up for download on Thingiverse its a good example of how the printing community shares and builds on each others’ work.

Does it take quality photos? We have no idea. So far we didn’t see any example pictures. But really, if you’re looking for top quality you might want to build your own digital camera. Here’s one that uses a 14 megapixel sensor.