b1tbkt writes "So it seems that furniture manufacturers have not yet acknowledged the realities of modern life. Kitchen tables could benefit greatly from built-in concealable receptacles. Even more obvious is the need for electrical wiring in couches and coffee tables. I realize that there are safety (fire) concerns but as it stands most families that I know already have power cords for laptops, tables and phones draped over, under and through their couches at any given point. If someone wanted to wire their furniture with AC or some type of standardized LV DC system, what are some dangers to watch for and what, if any, specialized hardware exists for the purpose?"

mikejuk writes "The new Arduino robot looks a bit like a robot vacuum cleaner, but it has a lot more going for it and it certainly doesn't suck — well not unless you add an air pump to it. As always, the Arduino Robot is completely open source and comes as an easy to assemble kit involving no soldering, just some plugging in of components. It consists of two circular boards, 19cm in diameter, each with its own Arduino controller. They fit together to create a stack about 10cm tall. The bottom board has two wheels and motors which allow it to move in any direction. The top board contains lots of sensors and a central display. The two communicate via a serial connection. There is also a lot of space for expansion. There is a new library which can be downloaded to help write programs for this fairly sophisticated robot. There is only one big problem with the Arduino robot — you can't buy one at the moment. If you really can't wait, until early July when they should start shipping from the Arduino shop and from distributors, then you will have to get to the Maker Faire San Mateo (May 17-19) where they are being demonstrated and sold."

New submitter TheJish writes "The RPiCluster is a 33-node Beowulf cluster built using Raspberry Pis (RPis). The RPiCluster is a little side project I worked on over the last couple months as part of my dissertation work at Boise State University. I had need of a cluster to run a distributed simulator I've been developing. The RPiCluster is the result. I've written an informal document on why I built the RPiCluster, how it was built, and how it performs as compared to other platforms. I also put together a YouTube video of it running an MPI parallel program I created to demo the RGB LEDs installed on each node as part of the build. While there have certainly been larger RPi clusters put together recently, I figured the Slashdot community might be interested in this build as I believe it is a novel approach to the rack mounting and power management of RPis."

hypnosec writes with word that the OpenWRT team a few days ago released the final version of the project's newest iteration, version 12.09 (codenamed "Attitude Adjustment"). "The final version doesn't support Linux 2.4, because of which the distribution wouldn't run on old router models, for example the Linksys WRT54G models, which have 16MB of RAM and CPUs clocked at 200MHz. The distribution is now based on Linux 3.3 and there is good news for the Raspberry Pi fans as the distribution now supports the credit card-sized computer, along with Ramips routers."

An anonymous reader writes with this snippet from ExtremeTech: "Researchers at the University of Washington's aptly named Ubiquitous Computing Lab can turn any LCD monitor in your house into a touchscreen, with nothing more than a $5 sensor that plugs into the wall and some clever software." The system works by measuring changes that your hand creates in the electromagnetic signature of the monitor. Surprisingly, it offers some pretty fine-grained detection, too: "full-hand touch, five-finger touch, hovering above the screen, pushing, and pulling." The "$5 sensor" part is mostly theoretical for now to those of us who don't live in a lab, though; on the other hand, "co-author Sidhant Gupta tells Technology Review that the $5 sensor uses off-the-shelf parts, and the algorithms are included in the paper, so it would be fairly easy for you — or a commercial entity — to recreate the uTouch system."

Blug_fred writes "For the first year the Digital Freedom Foundation (ex-SFI) is organizing Hardware Freedom Day. With 66 events worldwide split over 36 countries, they are not yet covering the whole world but it is a good start. So if you have always been wondering about hacking your own stuff, be it a piece of wood or some more complex electronic gears then it is time to join an open door day type of event. Sixty-six events is definitely less that the total number of hackerspaces around the world and you can check for other events happening in a hackerspace near you if none are celebrating today. Hopefully they will join the movement next year."

An anonymous reader writes "Hacker Benjamin Smith deconstructs the cycle of education, production, and rest that will be familiar to many software and hardware engineers. He breaks it down into four steps: 1) Focused effort toward a goal, 2) structured self-education, 3) side-projects to sharpen skills, and 4) burnout and rest. He writes, 'As my motivation waxes at the beginning of a cycle, I find myself with a craving to take steps towards that goal. I do so by starting a project which focuses on one thing only: building a new income stream. As a result of this single-mindedness, the content or subject of the project is often less interesting than it otherwise might have been. ... [Later], I almost always decide to teach myself a new technical skill or pick up some new technology. ... This is usually the most satisfying period of my cycle. I am learning a new skill or technology which I know will enhance my employability, allow me to build things I previously could only have daydreamed about, and will ultimately be useful for many years to come. ... [In the burnout phase], I'll spend this period as ferociously devoted to my leisure activities as I was to my productive tasks. But after a few months of this, I start to feel an itch...'"

anavictoriasaavedra writes "Adafruit Industries just posted the first episode in a new educational series aimed at teaching kids about electronics. The episode is entitled 'A is for Ampere' and teaches the basic theory behind electrical current. The subject seems like a common one for A-to-Z themed electrical tutorials. And yes, that's Collin Cunnigham as André-Marie Ampère."

Hesh writes "The University of Southern California has launched a website that contains the blueprints for many of their custom VR headsets as well as new mods to the much anticipated yet unreleased Oculus Rift. Some are helping push DIY VR forward through custom sensor mounts to support, for example, stereo cameras and others add more functionality like new eye cups to help increase the already large FOV of the headset. This is truly an exciting time for VR; by GDC, developers will already have Rifts in hand and tinkerers can 3D-print their own designs now as well!"

yanom writes "My school gave me several circa-2006 computers with no operating system. I fixed them up, and now they run Lubuntu fairly well, making them great internet/LibreOffice/general Linux workstations. I've been wanting to donate them to local nonprofits where they'll go to good use — for example, I've already given several to a local church for them to use in their afterschool care/tutoring program. However, I'm having trouble finding other places where these machines could go to good use. How should I best conduct this search? How can I find nonprofits that could benefit from these workstations?"

Hesh writes "With the impending arrival of the first batch of Oculus Rift VR headsets to developers, Rod Furlan put up a very detailed guide on how to build your very own headset with off-the-shelf parts and a few hours of spare time based off of the original design of the headset from the forums where it all started. This is a very exciting time for VR, and DIY headsets will allow everyone to try out new tricks and form factors while finally being able to test with a whole new world of compatible software that is about to be released very soon."

Blug_fred writes "The Digital Freedom Foundation is proud to announce the first celebration of Hardware Freedom Day on Saturday April 20th, 2013. While registration has opened about a month ago and early registrants will receive free banners, posters and swags as long as they register before Friday 15th, anyone who registers is of course welcome to celebrate the Day! So get your hackerspace into order, your team members ready and showcase your best 'Get Into Hacking workshop' to entice your neighbours to start. Still not lucky enough to be part of a hackerspace structure? Then use that day to meet people who will be willing to join you in the project!"

yenrabbit writes "A friend has just told me he has 80 CRT TVs, a stack of DVD players and hundreds of VCR machines, all broken and all mine free of charge. I can already think of a few awesome components I can extract (flyback transformers for high voltage contraptions and so on) and have a few ideas, such as DVD lasers, that I can build. But what else can be made from such a treasure-trove of components, and how would one go about processing such a large volume of stuff with the least amount of effort? Also, I don't have access to online shopping so I'd also like a pain free way of salvaging many simpler parts such as resistors as well." Another reader sent in a similar question: "The other day I went down to my University's property disposition center for the first time. In addition to mundane things like chairs and desks, it also had a wealth of technological devices, from old PCs and monitors to obscure medical and chemistry equipment. Honestly, I was a bit overwhelmed. I just don't know what I'd do with a old gene sequencing machine or a broken oscilloscope. Any ideas for fun projects? Or better yet, suggestions on how I can figure out which machines (or their components) are worth playing with?"

derGoldstein writes "We've seen some very impressive aerobatics performed by quadrocopters before, but this is getting ridiculous. Robohub points to the latest advancement from the Flying Machine Arena, which developed algorithms that allow quadrocopters to juggle an inverted pendulum. One of the researchers working on it said, 'We started off with some back-of-the-envelope calculations, wondering whether it would even be physically possible to throw and catch a pendulum. This told us that achieving this maneuver would really push the dynamic capabilities of the system. As it turned out, it is probably the most challenging task we've had our quadrocopters do. With significantly less than one second to measure the pendulum flight and get the catching vehicle in place, it's the combination of mathematical models with real-time trajectory generation, optimal control, and learning from previous iterations that allowed us to implement this.'"

Several readers sent word of a new addition to the 3-D printing industry. Most 3-D printers are roughly the size of regular printers, and require design files on the computer to guide the extruder. Now there's a much smaller and much simpler alternative: the 3Doodler pen, which lets you draw 3-D objects by hand. The people making the pen set up a Kickstarter project yesterday with a $30,000 goal. They reached that within hours, and now have pledges exceeding $800,000. "The 3Doodler pen is 180mm by 24mm. The pen weighs less than 200 grams or 7 ounces (the weight of a typical apple), although the exact weight will depend on the final shell specifications once in production. And we are using a universal power supply, so provided you have the correct adapter for your country, 3Doodler will work just fine on 110v or 240v. ... While the plastic extruded from 3Doodler is safe to touch once it has left the pen, the pen itself has a metal tip that can get as hot as 270C." The pen uses the same ABS/PLA plastic as most 3-D printers, and they're planning to host stencil designs on their website so that users have patterns to sketch from.

sciencehabit writes "When it comes to hanging on tight, the lowly mussel has few rivals in nature. Researchers have sought the secrets behind the bivalve's steadfast grip on wet, slippery rock. Now, a researcher says he has used the mollusk's tricks to develop medical applications. These include a biocompatible glue that could one day seal fetal membranes, allowing prenatal surgeons to repair birth defects without triggering dangerous premature labor."

An anonymous reader writes "Like the Roomba and other hackable consumer electronics, the Brookstone Rover 2.0 looks like a great value for hackers and robotics experimenters. Check out this teardown and another link within for lots of pics and info."

New submitter Zeussy writes "While looking around Thingiverse for something to 3D-print, I found this awesome public domain prosthetic hand designed for a 5-year-old child called Liam, who was born without any fingers on his right hand. The design is based on parts either 3D-printed or bought from your local hardware store. It's body powered via cables and bungees; see it in action in this video. They are currently running a Fundly Fundraiser."

crankyspice writes "Having recently picked up the Erector set I've wanted since I was a kid, I quickly found myself wanting to plunge deeper into makerspace by adding more sophisticated electronics to moving devices (rovers, maybe eventually flying bots). My first instinct was Arduino (maybe because of brand recognition?), but that got me thinking — what's the 'best' platform out there (most flexible)? Arduino with its myriad options (Nano, Mega, Uno, Mini)? PICAXE? BASIC Stamp? Raspberry Pi? (The latter seems like it would easily be the most flexible, but at greater cost in terms of weight and complexity.) I'm a hobbyist programmer, having learned C and C++ in college and recently re-learning Java (took and passed the Oracle Certified Professional exam, FWIW)..."

MikeChino writes "Instructables member Patrik has successfully transformed an old HP5150 inkjet printer into a DIY bioprinter. To do this he removed the plastic covers and panels and rewired the paper handling mechanism. Then he prepped ink cartridges to be able to handle biological materials by opening the lid, removing the ink, and washing it out with deionized water. For his first experiment, he printed a simple solution of arabinose onto filter paper."