Hacking Radio Controlled Outlets

March 10, 2014 By Leave a Comment

Decoding NRZ ASK

It’s no surprise that there’s a lot of devices out of there that use simple RF communication with minimal security. To explore this, [Gordon] took a look at attacking radio controlled outlets.

He started off with a CC1111 evaluation kit, which supports the RFCat RF attack tool set. RFCat lets you interact with the CC1111 using a Python interface. After flashing the CC1111 with the RFCat firmware, the device was ready to use. Next up, [Gordon] goes into detail about replaying amplitude shift keying messages using the RFCat. He used an Arduino and the rc-switch library to generate signals that are compatible with the outlets.

In order to work with the outlets, the signal had to be sniffed. This was done using RTL-SDR and a low-cost TV tuner dongle. By exporting the sniffed signal and analyzing it, the modulation could be determined. The final step was writing a Python script to replay the messages using the RFCat.

The hack is a good combination of software defined radio techniques, ending with a successful attack. Watch a video of the replay attack after the break.

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Filed Under: radio hacks Tagged With: , , , ,

Kinect + Wiper Motor + LEGO = 3D Scanner

March 9, 2014 By 3 Comments

bambergDE-scanner

[Christopher] from the Bamberg Germany hackerspace, [Backspace], wrote in to tell us about one of the group’s most recent projects. It’s a Kinect-based 3D scanner (translated) that has been made mostly from parts lying around the shop.

There are 2 main components to the hardware-side of this build; the Kinect Stand and the Rotating Platform. The Kinect sits atop a platform made from LEGO pieces. This platform rides up and down an extruded aluminum rail, powered by an old windshield wiper motor.

The Rotating Platform went through a couple of iterations. The first was an un-powered platform supported by 5 roller blade wheels. The lack of automatic rotation didn’t work out so well for scanning so out came another windshield wiper motor which was strapped to an old office chair with the seat replaced by a piece of MDF. This setup may not be the best for the acrophobic, but the scan results speak for themselves.

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Filed Under: 3d Printer hacks Tagged With: , , ,

Hackaday Links: March 9, 2014

March 9, 2014 By 3 Comments

hackaday-links-chain

Thinking about starting a CNC machine, 3D printer, or laser cutter project? Misumi has you covered. They’re offering up $150 worth of free stuff with a coupon code. [CharlieX] is putting together a BuildLog laser cutter, a whole bunch of people on reddit are building 3D printers, and I have most of the rods for an i3 build. Just use the promotion code First150 on your order. Actually, read the terms and conditions, but rest assured – this is legit.

A few months ago, we saw this Enigma cypher machine that combines the classic late-30s aesthetic of the original with modern hardware – including a few 16-segment displays. Now there’s a Kickstarter for the Open Source Enigma replica, and it looks like it’s going to end up being pretty popular. Here’s the site with all the deets. Check out that QWERTZ keyboard.

[Jason] has a love of LEGO and a terrible keyboard. Combine the two and he came up with a functional LEGO keyboard. The electronics are, sadly, an old PS/2 membrane keyboard, but the mechanicals are a work of art – all the keys are mounted on a grid of Technic parts that can be positioned over each of the membrane buttons.

Want a really cool look for your next enclosure? How about LED pipes? They’re those clear plastic bits that direct the light from LEDs around corners and can make any enclosure looks like a Star Trek set piece. You can cut these things with a laser cutter like the Alima team did with their indoor air quality meter. Looks pretty cool.

Filed Under: Hackaday Columns, Hackaday links Tagged With: , , , , , ,

Building The Mountainbeest

March 9, 2014 By 7 Comments

mounainbeest-pic

Builder extraordinaire and Hackaday alum [Jeremy] was asked by a friend about “doing something really crazy” for his local Makerfaire this year. That Makerfaire clock is ticking down, and not wanting to build awesome from scratch, referred his friend to a few of the temporarily shelved projects from the last year. The winning incomplete build was the Mountainbeest, a four-legged mechanical walker inspired by [Theo Jansen]‘s Strandbeest.

We’ve seen the beginnings of the Mountainbeest before, starting with [Jeremy] building the linkages for one leg. This build turned into two legs and now it’s a full-on quadruped, theoretically capable of rambling over the lush mountains in [Jeremy]‘s backyard.

The plan now is for [Jeremy] to get is Beest walking with the help of windshield wiper motors left over from a failed hexapod build. He’s not ging all the details yet, but it looks like the power train will be made out of bike parts. Video of the current state of the project below.

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Filed Under: robots hacks Tagged With: , ,

Next Weekend: The Midwest Reprap Festival

March 9, 2014 By Leave a Comment

midwest

Guess what next weekend is? It’s the Midwest Reprap Festival, in Goshen, Indiana. We’ll also be there keeping tabs on an absurd amount of new RepRaps and other 3D printers, new filaments, and distributing a ludicrous amount of Hackaday swag.

The highlights of the fest include the folks from Lulzbot and UltiMachine, [Prusa] showing off his i3, [Nick Seward] and the Wally, Simpson, and Lisa RepRaps, and hundreds of other RepRappers showing off their latest projects and printers.

Here’s the best part: it’s all free! It would be cool if you register before making the trip out, but any way you look at it, it’ll be an awesome weekend. It’s also the largest US gathering of 3D printer aficionados that isn’t on the east or west coast.

Filed Under: 3d Printer hacks, cons, Featured Tagged With: , , ,

Ask Hackaday: Wiping Your Bum With An Arduino?

March 9, 2014 By 65 Comments

TP

Over or under? Standing or sitting? Truly, toilet paper has been the focus of the most irreconcilable arguments ever. The folks on the Arduino StackExchange have a far more important question: how do you trigger an alarm when your TP supply is low?

[Asheesh] asked the Internet this question in response to his kids never replacing an empty roll. This eliminates the most obvious means of notifying someone of an empty roll – looking at it before you sit down – and brings up a few interesting engineering challenges.

Most of the initial ideas deal with weight or some sort of light sensor that can differentiate between the white TP and the brown roll. A much, much more interesting solution puts a radioactive source in the TP holder’s spring-loaded rod and uses a sensor to detect how much TP is left. A quick back-of-the-wolfram calculation suggests this might be possible, and amazingly, not too dangerous.

We’re turning this one over to you, Hackaday readers. How would you design an empty toilet paper alarm? Bonus points awarded for ingenuity and cat resistance.

Image source, and also one of the longest and most absurd Wikipedia articles ever.

Filed Under: Arduino Hacks, Ask Hackaday Tagged With: ,

Fetching Etchings for Stainless Steel

March 9, 2014 By 23 Comments

What do you do when you have a 10-gallon brew kettle (or any other stainless steel or aluminium thing) with no volume markings (or Hack a Day logos)? If you’re [Itsgus], you use science to etch some markings with a few household items and a 9V and you call it a day.

[Itsgus] used 1/4c vinegar and 1/4tsp of salt to form an electro-etchant and applied it with a Q-tip connected to the negative terminal of a 9V. He used tape to connect a wire between the positive terminal and the kettle. The vinegar dissolves the salt, creating negatively charged ions. Connected correctly to a 9V, the process removes metal where the current flows. If you were to connect it in reverse,  you would add a small amount of metal.

The process only takes a few seconds. When the etchant starts to sizzle and bubble, Bob’s your uncle. Even though the stainless steel’s natural coat re-oxidizes over the etches, you should probably wash that thing before you brew. If you prefer adding metal to removing it, try electroplating copper on the cheap.

Filed Under: Beer Hacks, chemistry hacks, cooking hacks, how-to Tagged With: , , ,
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