The news for RadioShack is not good. The retail chain that we hackers hold near and dear to our hearts is in financial trouble, and could go under next year. With just 64 million in cash on hand, it literally does not have enough capital to close the 1,100 stores it planned to in March of this year.
On May 27th, 2011, we asked you what RadioShack could do to cater to our community. They listened. Most of their retail stores now carry an assortment of Arduino shields, the under appreciated Parallax (why?), and even El Wire. Thanks to you. You made this happen.
Today, we are asking you again. But not for what RadioShack can do better. We’re asking what they can do to survive. To live. It makes no sense for RadioShack to compete in the brutal cell phone/tablet market, and makes every bit of sense for them take advantage of the rapidly growing hacker/builder/maker what-ever-you-want-to-call-us community. Let’s face it. We’re everywhere and our numbers are growing. From 3D printers to drones, the evidence is undeniable.
With 5,000 retail stores across the USA, they are in a perfect position to change their business model to a hacker friendly one. Imagine a RadioShack down the road that stocked PICs, ARMs, Atmels, stepper motors, drivers, sensors, filament….like a Sparkfun retail store. Imagine the ability to just drive a few miles and buy whatever you needed. Would you pay a premium? Would you pay a little extra to have it now? I bet you would.
Now it’s time to speak up. Let your voices be heard. Let’s get the attention of the RadioShack board. You’ve done it before. It’s time to do it again. Hackers unite!
Last week, we heard of an interesting Kickstarter that puts a capacitor and charging circuit in the same space as a AA battery. This is usually a very simple endeavour, but this capacitor has the same energy density as an alkaline cell. The chemistry inside this capacitor was initially attributed to lithium ion, and a few people in the comments section were wondering how this was possible. The math just didn’t seem to add up.
The guy behind this Kickstarter, [Shawn West], recently spilled the beans on these… interesting capacitors. Apparently, they’re not lithium ion capacitors at all, but graphene capacitors. Graphene capacitors you can buy. On Kickstarter. Graphene capacitors, also known as the thing that will change everything from smartphones to electric vehicles, and everything in between. I will admit I am skeptical of this Kickstarter.
Apparently, these graphene supercaps are in part designed and manufactured by [Shawn] himself. He fabricates the graphene by putting graphite powder in a ball mill for a day, adding a bit of water and surfactant, then running the ball mill for another few days. The graphene then floats to the top where it is skimmed off and applied to a nonconductive film.
There’s absolutely nothing that flies in the face of the laws of physics when it comes to graphene capacitors – we’ve seen a few researchers at UCLA figure out how to make a graphene supercap. The general consensus when it comes to graphene supercaps is something along the lines of, ‘yeah, it’ll be awesome, in 10 years or so.’ I don’t think anyone thought the first graphene capacitors would be available through Kickstarter, though.
I’m a little torn on this one. On one hand, graphene supercaps, now. On the other hand, graphene supercaps on Kickstarter. I’m not calling this a scam, but if [Shawn]’s caps are legit, you would think huge companies and governments would be breaking down his door to sign licensing agreements.
Post your thoughts below.
Atop a small mountain in Colorado Springs sat the small, makeshift laboratory of Nikola Tesla. He chose this location because the air was thinner, and therefor more conductive. Tesla had come to believe that he could use the Earth as a conductor, and use it to send electrical power without the need for wires. Though some facts are forever lost, it is said that on a clear, moonless night, Tesla flipped the switch that fed millions of volts into a large coil that towered high into the air. He cackled maniacally as an eerie blue corona formed around the crackling instruments, while some 200 florescent bulbs began to glow over 25 miles away.
A magnificent feat took place in the hills of Colorado that night. A feat that surely would change the world in how it harnessed electricity. A feat that if brought to its full potential, could provide wireless power to every point on the globe. A feat that took place almost one hundred and twenty years ago…
Continue reading “Ask Hackaday: Global Energy Transmission – Can It Work?”
A little more than one month ago we featured a Kickstarter campaign that was raising quite a lot of eyebrows and over half a million dollars. This particular product was a battery-free tag meant to be attached to anything you may lose in your daily life. It was supposed to communicate with Bluetooth Low Energy (BLE) devices and have a 200ft (60m) detection range.
The main claim was that the iFind could harvest enough power from existing RF fields inside a typical home environment to operate for centuries. As Kickstarter just cancelled its funding a few minutes ago it seems that the basic maths Hackaday did a while ago were correct and that the project was in fact a scam. We’ll direct our readers to this particular comment that sums up all the elements pointing to a fraudulent campaign and show you the email that the backers received:
A review of the project uncovered evidence of one or more violations of Kickstarter’s rules, which include:
- A related party posing as an independent, supportive party in project comments or elsewhere
- Misrepresenting support by pledging to your own project
- Misrepresenting or failing to disclose relevant facts about the project or its creator
- Providing inaccurate or incomplete user information to Kickstarter or one of our partners
Putting aside this news, this campaign’s cancellation raises a bigger question: why didn’t it happen before and how could we control Kickstarter campaigns? On a side note, it’s still very interesting to notice the nearly religious fervor of the sunk cost fallacy that such campaigns create in their comments.
Thanks [Rick] for the tip!
A team based in Russia has developed a program that has passed the iconic Turing Test. The test was carried out at the Royal Society in London, and was able to convince 33 percent of the judges that it was a 13-year-old Ukrainian boy named Eugene Goostman.
The Turing Test was developed by [Alan Turing] in 1950 as an existence proof for intelligence: if a computer can fool a human operator into thinking it’s human, then by definition the computer must be intelligent. It should be noted that [Turing] did not address what intelligence was, but only tried to identify human like behavior in a machine.
Thirty years later, a philosopher by the name of [John Searle] pointed out that even a machine that could pass the Turing Test would still not be intelligent. He did this through a fascinating thought experiment called “The Chinese Room“.
Continue reading “Ask Hackaday: Program Passes Turing Test, but is it Intelligent?”
[Vishak] tipped us about the iFind Kickstarter campaign, a 1.25×1.06×0.09″ (32x27x2.4mm) tag meant to be attached to anything you may lose in your daily life. This device communicates with Bluetooth Low Energy (BLE) enabled smartphones, has a 200ft (60m) detection range and a loud alarm. What is interesting to mention is that this device doesn’t need any battery to operate as it
recycles electromagnetic energy and stores it in a unique power bank.
As you can guess, this particular claim intrigued the Hackaday team given that we never featured so small energy harvesting devices. The ‘closest’ thing that comes to our minds is the Allsee project, a simple gesture recognition device that uses existing wireless signals (TV and RFID transmissions) to extract any movement that occur in front of it. However the antenna was quite big and very little power was extracted.
A quick Google search let us know that Bluetooth Low Energy solutions usually consume an idle current of around 10uA @ ~3V. The (very) successful Sticknfind campaign which promoted the same battery-enabled product claimed a one year autonomy with a CR2016 battery and a 100ft range, leading to a ~90mAh/24/30.5/12 = 10.2uA idle current. As we’re not expert on the subject, we would like to ask our readers if they ever came across such energy harvesting performances (3V*10.2uA = 30uW) in a normal home environment. Our very bad maths indicate that if one would like to extract power from a typical Wifi router located 2 meters from you emitting 0.5Watts of power (in a perfect vacuum environment) with a 32*27mm = 864mm = 0.000864m² tag you’d only be able to get 0.5 * (0.000864/(4*pi*2*2)) = 8.6uW.
It is therefore too bad that we can’t see in the presentation video what is inside the iFind, nor more details about the patent pending technologies involved. We hope that our dear readers will enlighten us in the comments section below.
[Johann] over on the RepRap wiki has an ingenious solution for making sure a borosilicate glass bed is completely level before printing anything on his Kossel printer: take three force sensitive resistors, put them under the build platform, and wire them in parallel, and connect them to a thermistor input on an electronics board. The calibration is simply a bit of code in the Marlin firmware that touches the nozzle to the bed until the thermistor input maxes out. When it does, the firmware knows the print head has zeroed out and can calculate the precise position and tilt of the bed.
Great, huh? A solution to bed leveling that doesn’t require a Z-probe, uses minimal (and cheap) hardware, and can be retrofitted into just about any existing printer. There’s a problem, though: these force sensitive resistors are only good to 70° C, making the whole setup unusable for anything with a heated bed. Your challenge: figure out a way to use this trick with a heated bed.
The force sensitive resistors used – here’s a link provided by [Johann] – have a maximum operating temperature of 70° C, while the bed temperature when printing with ABS is around 130° C. The FSRs are sensitive to temperature, as well, making this a very interesting problem.
Anyone with any ideas is welcome to comment here, on the RepRap forums, the IRC, or anywhere else. One idea includes putting an FSR in the x carriage, but we’re thinking some sort of specialized heat sink underneath the bed and on top of the FSRs would be a better solution.
Video of the auto bed leveling trick in action below.
Continue reading “Ask Hackaday: Auto Bed Leveling And High Temperature Force Sensitive Resistors”