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Sound Responsive High Power LED Array->

Submitted by
Gibbs-Duhem
Gibbs-Duhem writes "This video shows operation of a neat project using some new digital analysis chips to produce hacker-friendly sound-responsive LED modules similar to old color organs, but much smaller, easier to set up, and modular. As usual, the boards are open-hardware, and both eagle schematics and board layouts are available on the website. The artist is constructing a 10x10 array using a Kickstarter Project, which will put out 25,000 lumens of light for a display at Burning Man. This work is from the same artist who previously built wifi LED lighting for some pretty cool installations around the country and lights with ultra-high CRI and added ultraviolet LEDs for use with artwork display."
Link to Original Source

Autonomous Sound Responsive High Brightness LED Modules->

Submitted by
Gibbs-Duhem
Gibbs-Duhem writes "This is a cool little art project on Kickstarter where a bunch of individual high power LED lights are souped up with built in audio analysis hardware and an onboard microphone. At scale, these modules put out over 250 lumens a piece, and can be assembled into enormous arrays in any shape or size for under $50 per module for a modern version of the color organs built in analog back in the day. By the same artists who put together quite a few other cool audio oriented high power LED lighting systems, and other sophisticated lights for use with artwork previously covered on Slashdot. As usual, schematics, design information, and board layouts are available for the project."
Link to Original Source
Android

Ask Slashdot: How do you protect data on Android?

Submitted by
Gibbs-Duhem
Gibbs-Duhem writes "Dear Slashdot,

It makes me very nervous that my android phone has access to my email/AIM/gtalk/facebook/... protected only by a presumably fairly easily hacked geometric password protection scheme. Even more because simply attaching the phone to a USB port allows complete access to the internal memory and SD card regardless of whether a password is entered. I have no idea how much of that information ranging from cached emails to passwords stored in plaintext is accessible when mounting the device as a USB drive, and that worries me.

I have a lot of sensitive information in my email, including passwords for websites and confidential business/technical strategy discussions (not to mention personal emails ranging from racy emails from boyfriends to health discussions). My email and messaging client passwords are difficult to type (or even remember), so I would ideally want them saved in the device, although at least having something like a keyring password that needed to be re-entered after a time delay would make me feel better. This leaves me relying on encryption and OS level security to protect me.

I'm okay with this on my real laptop and computers as my hard disks are software encrypted and I make a habit of locking my session whenever I leave my desk. For instance, if I lost my laptop, the odds of the thief getting access to my information is minimal. However, I don't feel that this is at all true for my phone (which is frankly far more likely to be lost).

How is it that the slashdot security pros handle this issue? Do you just not use email or the many other incredibly convenient capabilities of new android smartphones due to the risk? Or are there specific ways in which we can guarantee (or at least greatly augment) the existing security practices?"

Comment: Re:just tried it; not sure its a great idea (Score 1) 70

by Gibbs-Duhem (#36900654) Attached to: Sharing Electronic Schematics

The problem I was talking about is where a schematic with 50 parts on it is a giant rats nest of stuff all on a single page that someone then tries to fit onto a single page/monitor, making extensive panning and zooming necessary to understand what's going on. Following the rules I outlined prevents that problem by making it so you can simply print out the images on a normal sized piece of paper and find everything completely legible (and similarly with most monitors).

The problem that you are talking about is one that can be solved with any moderately competent image viewer. Even firefox's automatic image scaling is perfectly capable of handling it, within reason. If that's all that this javascript tool accomplishes, then it is incredibly sad how slow it is. On my computer it hangs for a good 20 seconds when trying to zoom in or out, and god forbid I try to drag the image. Surely a better tool for dynamic image viewing already exists -- the one on amazon.com seems to work fine, after all, for the same task.

And yes, the PNG image is 2952x2202 pixels, but it's also 70kB... this isn't exactly an unwieldy image. And if it were a vector graphic or pdf, it'd probably be even smaller. I only chose not to do that because there is less support for it in browsers... like how I can't open PDFs inline in firefox very pleasantly.

Comment: Re:just tried it; not sure its a great idea (Score 1) 70

by Gibbs-Duhem (#36900590) Attached to: Sharing Electronic Schematics

If it had labels for logical blocks, I think that the schematic you linked to would be perfectly legible. A bit overkill, but at least it's not messy. What if there were two LEDs? Three? Four? There is definitely a limit where no matter how obvious the connection is, it increases legibility to use named nets.

Comment: Re:just tried it; not sure its a great idea (Score 1) 70

by Gibbs-Duhem (#36888056) Attached to: Sharing Electronic Schematics

Yeah, I definitely agree with this. This seems to be a solution to the problem "how can I make illegible and amateurish schematic drawings more readable without learning anything?"

Use a frame that limits the total schematic size to a standard paper size. Use named nets and labels on nets instead of actually connecting wires between parts (except for trivial connections like capacitors). Put lines in your schematic that separate logical blocks of your schematic. Label logical blocks with a title (AC Rectifier, Boost Converter, Control System, ADCs, Filters, etc). This makes it trivial for someone to look at your schematic and rapidly identify errors. It makes it simpler for *you* to rapidly identify errors!

Just follow these four simple rules and your schematics (pretty much regardless of software used to make them) will suddenly appear to be fairly professional (if not perfect). For examples, take a look at this. I'm not an EE by any means, but the more you separate functionality into logical blocks and limit your size with frames, the closer it looks to "professional".

http://saikoled.com/lightshield/
http://saikoled.com/lightbrick/
http://web.mit.edu/neltnerb/www/artwork/design.html

(for the last link, some fairly complex schematics are shown in the "New Schematics and Diagrams" section. The ones near the top are duplicates of what I published on the other website.)

Comment: Re:Am I the only one who saw this? (Score 2) 135

by Gibbs-Duhem (#36360052) Attached to: MIT Develops Fast Charging Liquid Flow Batteries

You can either have academic labs researching things which are commercially interesting, and then give the professors working on it the perk of having the opportunity to commercialize it first (or at least royalties), or you can have academic labs researching things which the professor is academically interested in, and hope that it is commercially interesting. It is difficult to get both.

Either you get people complaining that publicly funded research isn't free to the public to use, or you get people complaining that stuff invented in academia has no practical application. And since there aren't any industrial research labs left, that means either no commercially interesting research, or encumbered research.

Not to mention that it would be *damn* hard to get professors to work for peanuts (seriously, I've seen what these people make for their qualifications) while training basically all high-skill future scientists, and under a contract where all work they do they can't even commercialize because some big company will snap it up underneath them.

No, I'm afraid that I have to disagree with your position. Yes, I have a bias because I am working very hard to commercialize technology that my lab invented, but I also think that is is more than fair to give the actual inventors first dibs on trying to commercialize something. I would have left academia in a hurry and just did all my work as a trade secret pretty quickly otherwise.

National labs of course are a totally different story. Usually their inventions are licensed under reasonable terms in only non-exclusive licenses. But those inventors are *working* for the government as opposed to just having a small fraction of their costs paid for by a government grant.

Comment: Re:Retailers (Score 5, Insightful) 142

by Gibbs-Duhem (#36333148) Attached to: Asus To Ship Ubuntu 10.10 On Three Eee PC Netbooks

I dunno, they seem to manage fine with iOS and android. We're talking about netbooks, so the different form factor makes people intuitively not expect it to be *exactly* the same as what they've always used. And Unity is closer to looking like android/iOS than windows, which makes even more sense if the device is looking more like a phone than a desktop... although I definitely agree that not including Unity is an obvious choice. That stuff is just a disaster at present.

Comment: Re:New tech? (Score 3, Interesting) 325

by Gibbs-Duhem (#36310840) Attached to: Using Flywheels to Meet Peak Power Grid Demands

If memory serves, the giant flywheel that MIT uses to spark their fusion test reactor is rigged with explosive charges to blow it to pieces if it ever came loose. I believe the calculations show that without detonating it, it would likely continue *through* several buildings before landing in the Charles River... could have been an urban legend though.

Comment: Re:Cool, energy arbitrage (Score 1) 325

by Gibbs-Duhem (#36310792) Attached to: Using Flywheels to Meet Peak Power Grid Demands

I have heard from electric companies that they have absolutely no problem with this. People doing "energy arbitrage" are essentially helping the power companies even out the grid, which means said power company doesn't have to turn on the expensive natural gas generators as often (or purchase less natural gas power when they are on). You're just getting into the business of providing space and equipment to do grid leveling informally.

Waking a person unnecessarily should not be considered a capital crime. For a first offense, that is.

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