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271 items tagged "design"
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16:01
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Hack a Day
Inspired by a design he saw on the EEVblog, [George Graves] put together this constant current dummy load. You might need on of these if you’re testing power supplies or batteries. They pull a constant current regardless of the voltage of the supply. [George's] version extends the range of the original a little bit by [...]
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21:48
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SecDocs
Authors:
Bernd Sieker Tags:
science Event:
Chaos Communication Congress 27th (27C3) 2010 Abstract: Getting the interfaces right to computers controlling complex and dangerous machines such as commercial airliners is crucial. I will present a successful accident analysis method and talk about interface design problems, ideas for solutions, methods for understanding causal control flow. There will be some spectacular aviation accident videos and stories of bad luck, bad design, bad decisions, and a hero that managed to turn a near-catastrophe into an accident without fatalities. Getting the Interface right can be crucial. So does an understanding of the underlying logic, and knowledge of correct procedures when operating complex devices. Modern airliners are incredibly complex machines, no person can fully understand what is going on. This starts at simple things like fuel systems (e. g. the B777 has only two engines and three fuel tanks, how complicated can that be? Surprisingly so.) and goes on to autopilots, autothrottle systems, FADECs (Full Authority Digital Engine Control), Flight Management, Guidance and Envelope Computers (FMGEC), digital fly-by-wire systems, weight computations etc. Apart from the largely unsolved problems of how to create software for these systems that is demonstrably extremely reliable (in commercial aviation we're talking about probablities of dangerous failures of 1 in a billion flight hours: testing just won't do), there is the underrated question of getting the interface right. What to annunciate to the crew and when, and in which form? Some accidents and incidents are directly related to a flight crew being confused by the annunciations, or didn't know how to react properly to seemingly unrelated warnings. At other times, a pertinent and important warning is suppressed because another, ostensibly more important warning inhibited the other one. I'll be talking about some accidents that we have analysed using Why-Because-Analysis (see http://www.rvs.uni-bielefeld.de/research/WBA/) in which the interface and the automation played a role. I will also be talking about some design principles to guide interface design and interactive safety.
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21:48
»
SecDocs
Authors:
Bernd Sieker Tags:
science Event:
Chaos Communication Congress 27th (27C3) 2010 Abstract: Getting the interfaces right to computers controlling complex and dangerous machines such as commercial airliners is crucial. I will present a successful accident analysis method and talk about interface design problems, ideas for solutions, methods for understanding causal control flow. There will be some spectacular aviation accident videos and stories of bad luck, bad design, bad decisions, and a hero that managed to turn a near-catastrophe into an accident without fatalities. Getting the Interface right can be crucial. So does an understanding of the underlying logic, and knowledge of correct procedures when operating complex devices. Modern airliners are incredibly complex machines, no person can fully understand what is going on. This starts at simple things like fuel systems (e. g. the B777 has only two engines and three fuel tanks, how complicated can that be? Surprisingly so.) and goes on to autopilots, autothrottle systems, FADECs (Full Authority Digital Engine Control), Flight Management, Guidance and Envelope Computers (FMGEC), digital fly-by-wire systems, weight computations etc. Apart from the largely unsolved problems of how to create software for these systems that is demonstrably extremely reliable (in commercial aviation we're talking about probablities of dangerous failures of 1 in a billion flight hours: testing just won't do), there is the underrated question of getting the interface right. What to annunciate to the crew and when, and in which form? Some accidents and incidents are directly related to a flight crew being confused by the annunciations, or didn't know how to react properly to seemingly unrelated warnings. At other times, a pertinent and important warning is suppressed because another, ostensibly more important warning inhibited the other one. I'll be talking about some accidents that we have analysed using Why-Because-Analysis (see http://www.rvs.uni-bielefeld.de/research/WBA/) in which the interface and the automation played a role. I will also be talking about some design principles to guide interface design and interactive safety.
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16:21
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Hack a Day
[Matias] is just getting into hobby electronics and decided to push the limits of his skill by building this game clock. He comes from a software design background and that really shows through in the UI design seen in the video after the break. We enjoy the journey through his prototyping process which started with [...]
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9:01
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Hack a Day
Late last week, we saw a rather clever combination lock build that used only a single 74xx logic chip. [J. Peterson] read this post, and in a battle royale of geek one upmanship sent us a write up of the logic chip computer he built nearly 30 years ago at the University of Utah. Around 1982 or [...]
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14:01
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Hack a Day
[Entropia] decided to try his hand at rolling is own sound card. He picked out a DAC chip, started his prototyping by studying the reference design from the datasheet, then went through several iterations to arrive at this working model. He chose to base the board around the PCM2706. It’s a digital to analog converter [...]
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12:00
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Hack a Day
Here are the guts of [Lukasz's] infrared camera remote control. He based it off of an existing design, but looked for places where improvements could be made. He felt the ATtiny2313 was a bit wasteful in this case. But further investigation led him to see why it was chosen. If you were to drop down [...]
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8:50
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Packet Storm Security Advisories
Design flaws make it possible to find out hash of the secret used for URL generation in secureURL.php version 2.0. The problem enables malicious parties to calculate checksum over fabricated URL parameters. The design flaws render the system ineffective against attacks and gives a false sense of security.
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8:50
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Packet Storm Security Misc. Files
Design flaws make it possible to find out hash of the secret used for URL generation in secureURL.php version 2.0. The problem enables malicious parties to calculate checksum over fabricated URL parameters. The design flaws render the system ineffective against attacks and gives a false sense of security.
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10:01
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Hack a Day
[Trax] needed an LC meter and decided to use a tried-and-true design to build his own. The only problem was that he didn’t want to be tied to a bench supply or power outlet, which meant a bit of auxiliary design was in order. What he came up with is the battery-powered LC meter you [...]
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7:03
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Hack a Day
[John] wrote in to tell us about this contest hosted by Avnet. All one has to do is upload a video of their design to Avnet’s Youtube page. There are four categories to choose from including: Solar, Communications, Transportation, and Entertainment. Four contestants can win an iPad2. The only catch, if you can call it [...]
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14:09
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Hack a Day
[Cody Sumter] and [Jason Boggess] are students at the MIT Media Lab, and they just came up with Minecraft.Print(), an attempt to create a bridge between Minecraft and the real world via 3D Printers. The print is first prepared by placing obsidian, diamond, gold, and iron blocks on opposite corners of the model in Minecraft. [...]
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5:05
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Hack a Day
[Bill Porter] has a tip for designing circuits that have multiple connections to a single microcontroller UART. This stemmed from a review of a friend’s circuit design that used the UART in the project, but also called for an FTDI chip in order to reprogram via USB and a bootloader. Unlike the schematic above, the [...]
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8:00
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Hack a Day
[Richard] has been working on the concept of “incorporating more feeling into our digital objects”. His design is still just a concept but hopefully someone will take up the idea because we think the results would be amazing. The attention to detail in the design is impressive, the Rotary Mechanical Smartphone as he is calling [...]
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14:15
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Hack a Day
Want to improve the finished look of your projects? There’s a lot you can learn by looking at the choices made in consumer electronics. [Bill Hammack] explores what is perhaps the most refined electronic device out there, the cell phone. Specifically, he discusses the seven design constraints that face every cellphone maker. They are: compactness [...]
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15:21
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Hack a Day
[Scott] is a design and technology master’s student who just came up with The Imaginary Marching Band – virtual band instruments you can wear on your hand. Taking inspiration from Minority Report and the NES Power Glove, the system is able to emulate 6 instruments at this point – A trumpet, trombone, tuba, snare drum, [...]
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11:00
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Hack a Day
[Joe Schlesinger] of MakeIt Labs wrote in to let us know about an upcoming live chat session march 28th on IRC to discuss DARPA’s latest project, the Adaptive Vehicle Make. DARPA, in the pursuit of innovative high-risk high-payoff tactical technology is looking to crowd-source the design and construction of the 3000-5000 parts that make up [...]
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10:02
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Hack a Day
Up to this point we’ve used Eagle CAD as our exclusive PCB design and schematic layout tool. But [Brian] has inspired us to try something different thanks to his KiCAD tutorial. KiCAD is an open source printed circuit board design tool. Since we like to rock the Linux here at Hackaday getting our hands on [...]
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7:58
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Hack a Day
[Bob] has been busy lately putting the finishing touches on three different projects that he plans on entering into the 555 Design Contest. His first entry is a low-power H-bridge, which can be used to drive small servos. While he admits that it is a bit odd to build use a 555 timer to construct [...]
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6:02
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Hack a Day
The 555 Design Contest shook a whole bunch of really creative circuits out of the trees, hence the 555-heavy content lately. While not technically part of the contest, [esalazar] wanted to know what made the 555 tick, literally! He started working on the project in a circuit simulator, then ultimately ended up building the three [...]
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4:06
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Hack a Day
Sure, microcontrollers are useful, easy to apply, and ubiquitous, but where is the fun in the easy route? Well, for those of you out there with a little imagination and a 555 timer sitting around, there could be rewards in store. Brought to you by such famous personalities as Jeri Ellsworth and Chris Gammell, the 555 [...]
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13:42
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Hack a Day
[JC] built himself a hexapod based on a project he found on the Internet. It worked fairly well, but was mechanically weak and prone to breakage. He set out to improve the design and came up with the unit seen above. It uses three servo motors to control the six legs, and walks quite well [...]
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12:30
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Hack a Day
[AndyO] embraced his inner geek by building this meter clock. It exhibits a lot of features that you’d want to see in a home-built timepiece, include over-complexity, abundant features, and RGB LEDs. We’re fascinated by the design he put into this. For instance, the two indicator LEDs on the clock face are not poking through [...]
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6:00
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Hack a Day
It seems that we have caught Design Contest Fever here at Hackaday. After covering some other design contests, and asking readers to send in more, we heard from a couple tippers about Renesas’ challenge. Like many of the other contests, entrants can submit their ideas, and possibly receive a free development board to get them [...]
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9:00
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Hack a Day
EBVElectronik of Germany is hosting a design contest based around the STM32F microcontroller. They are inviting engineers and inventors to come up with the best general purpose design ideas, with prizes including a Harley Davidson Motorcycle and a 1000 euro Apple voucher. Even better, they are offering a free STM32 Discovery Kit to anyone who [...]
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14:00
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Hack a Day
These speakers are hand made and almost one of a kind. [Lluís Pujolàs] didn’t come up with the original design, but he sure did an amazing job of crafting them, including an eleven page build log (translated). They’re called the Odyssey 2, after the original design. The shell-shaped cavity on the bottom was built as a wooden [...]
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6:00
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Hack a Day
The Hack a Day store has a couple new items. It was brought to our attention that we once held a T-shirt contest, and people really wanted access to that design. Well, now you can get it. The design on the shirt will be roughly 13″x10″ and located at the hem under the right arm. [...]
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11:03
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Hack a Day
[Colin] has cut his teeth with about fifteen PCB orders. He wrote a tutorial describing the process and sharing his tips on avoiding common problems. You may remember our own How-To prepare designs for manufacture early last year. In that post, [Ian] shared his veteran knowledge by outlining BatchPCB’s board design process. This time, [Colin] is [...]
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8:03
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Hack a Day
Regular reader [Osgeld] built a 1024 LED display matrix. This is a proof-of-concept design and he admittedly has overloaded the components. Most notably, the 595 shift registers (featured over the weekend) are sourcing too much current if all eight pins are active. That’s easy enough to fix in the next design by moving up to [...]