The post The Interactive Sound Art of Peter Vogel appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.
Sunday, January 31
The Interactive Sound Art of Peter Vogel
How to science up your coffee
(credit: Amanda)
Coffee is one of the most popular drinks worldwide, with countless cups of the dark, alluring elixir brewed up each day. And, lucky for those coffee-guzzlers out there, mounting data suggest it’s good for you; moderate coffee drinking has been linked to lowered risk of cardiovascular disease, liver diseases, diabetes, and an overall lowered risk of dying too soon.
But, as coffee-lovers happily continue sipping their morning fix with a dash of self-satisfaction, it’s worth noting that not every cup of coffee is equal. Brewed coffee can vary wildly in its flavor and chemical make-up, particularly the chemicals linked to health benefits. Everything that happens before the pour—from the bean selection, roast, grind, water, and brew method—can affect the taste and quality of a cup of joe.
So far, there’s little to no data on the health impact of drinking one type of coffee over another. In studies linking coffee to lowered risks of disease and death, researchers mostly clumped all coffee types together, even decaffeinated coffee, in some cases. But, there is a fair amount of data on individual components of coffee that are flavorful and beneficial—and how to squeeze as much them as possible into your mug. Here’s what the science says:
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Tribed 3D Printer Configuration Doesn’t Ever Need To Be Leveled
[Jeremie Francois] has been thinking about ways to improve tool height adjustment and bed leveling in his 3D printer for a long time. His dream was to never ever think about Z height again. A dream that’s shared by many. These days, a lot of 3D printers have a mechanism for auto leveling in the software of the 3D printer. This works pretty well, but for various mechanical reasons, it’s better to have the bed itself be level.
[Jeremie]’s approach is pretty clever. Since you can define any plane mathematically with three points, he has three Z-axis lead screws. This lets him tilt the bed at any angle he likes. Once he had the mechanics in place, he added some force sensitive resistors, an Arduino, and wrote an extension for the popular Marlin firmware. That’s when the problems started.
It turns out that solidly mounting the bed to the resistors transmitted way too many vibrations. The solution was a layer of neoprene rubber. The neoprene also acts as a cushion, so the nozzle won’t break the glass bed during the leveling procedure.
The video after the break is a bit wavy, due to YouTube’s terrible auto-stabilizing software, but if you watch closely, you can see the system at work.
Filed under: 3d Printer hacks
Neato BotVac Connected review: A LIDAR-powered robot vacuum is my maid now
The Neato BotVac Connected.
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It's been about two months since I've vacuumed my house, and the floor has never been cleaner. That's because I haven't been doing it—a robot has. For the past two months we've had a Neato BotVac Connected rolling around the house, the latest robo vac in Neato's lineup. Like all Neato robots, this has a spinning LIDAR unit that maps out the house. In this new "Connected" version, it's got Wi-Fi and a smartphone app.
The household name in household robots is definitely iRobot's Roomba, a round robotic vacuum cleaner that popularized the idea of having a little bot clean up after you. The fundamentals of the Roomba haven't changed much since its introduction: it's a vacuum on motorized wheels with a bumper plate in the front. When the plate bumps into something, the robot knows it hit an obstacle and changes directions. Start a Roomba on floor and usually it will spiral outward until it hits a wall, try to feel out the perimeter of the room, and then ping pong all across the center of the house in an attempt to cover the interior space.
Most Roombas can't "see." Its only window to the outside world is the little bumper plate—it feels its way around a space by running into stuff. Roomba will say it takes this limited information and runs it through an algorithm to be a little smarter than "randomly driving around," but to the human eye, there's little logic to where the little disk is driving.
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Starting the racing year right at the Rolex 24
Rob Woolsey
Dayonta International Speedway, the home of NASCAR and IMSA (the organizing body for the WeatherTech SportsCar Championship). The track just received a $400 million upgrade.
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DAYTONA BEACH, Fla.—The Rolex 24 at Daytona is the start of the American sportscar racing season. Since it happened to coincide with my 40th birthday, we decided to fly down to Florida to check it out. The main event is a 24-hour race for the WeatherTech SportsCar Championship, which you might remember last year as the Tudor United SportsCar Championship. The race involves four different classes of car racing on track at the same time.
The fastest cars race in the Prototype class, a mix of older Daytona Prototypes (tubeframe race cars) and LMP2s (carbon fiber prototypes that race at Le Mans). Next quickest are the GTLM cars, which are factory-supported racecars based on roadgoing machines like the Corvette Z06 and Porsche 911. Both Prototypes and GTLM feature lineups of professional drivers, many of whom are world-class. Several stars of NASCAR and IndyCar were in the field this year.
The next two classes are pro-am, where wealthy amateurs are joined by professional hotshoes. There are the Prototype Challenge cars, which are all identical open-cockpit cars with Chevy V8s. The other pro-am class is GTD, which this year uses the GT3 technical ruleset. Like the GTLM cars, these are based on road-going machines like Lamborghini Huracáns and Dodge Vipers, but there is less room for technical development.
It's been an action-packed race so far (with almost six hours left to run at the time of writing). Who wins is anyone's call. You can catch the end of the race on Fox Sports or streaming via the IMSA website or app.
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Today, a California ghost town can have fiber to the doorstep—but it’s not easy
Dave Loschiavo
Totally understand why the author wants to live here.
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SLOAT, CALIFORNIA—Plumas County is rural, mountainous, and at the far north of the Sierra Nevada Range. In area, it is larger than the individual states of Rhode Island and Delaware, but the population here is under 20,000. It all makes for a beautiful place to live, but some amenities that are common in more densely populated areas can be hard to come by.
High-speed Internet access that’s reliable across all seasons of the year is one clear example. In 2014, the local cable TV provider (New Day Broadband) went bankrupt, taking with it the only source for cable-based Internet access in the town of Quincy, California. It was also the only tethered high-speed provider accepting new customers. AT&T used to offer DSL in the area, but the company stopped taking on new clients and does not allow existing customers to transfer service. And while both satellite Internet access and multiple WISPs (wireless ISPs) are available, both of these delivery methods face reliability challenges in stormy, snowy weather (a common occurrence for this area in the winter).
With that in mind, you can imagine my surprise when in recent years I learned a local ISP—Plumas Sierra Telecommunications—now offers fiber to the doorstep. This new availability of reliable, high-speed Internet access allowed me to shift from an office job to telecommuting, meaning my wife and I could return to the rural Sierra Nevada after 15 years of living in the metropolis of Southern California.
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On American Indian reservations, challenges perpetuate the digital divide
An access point tower constructed by Tribal Digital Village overlooks Pala, California. (credit: Tribal Digital Village)
Recently, Sam Tenakhongva, a teacher living on the Hopi reservation in northern Arizona, bought a Chevrolet pickup truck equipped with integrated 4G LTE. As the company’s advertising boasts, the feature was novel for a commercial vehicle and unprecedented for a truck. Intrigued, Tenakhongva decided to take advantage of a free trial.
It didn’t take long for him to eschew the service. The truck only connected when Tenakhongva was in a 4G network and, given the region’s limited broadband access, Tenakhongva knew such an occurrence would be too rare to justify the cost.
Today, this situation rings true for an overwhelming majority of American Indians living on reservations. This year, the Federal Communications Commission reported that 41 percent of Americans living on tribal lands lacked access to broadband (which the FCC currently defines as 25Mbps for downstream speeds and 3Mbps for upstream speeds); that number leaps to 68 percent for those in rural areas of tribal lands.
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ESP8266 Transmits Television on Channel 3
We’ve seen a lot of ESP8266 projects in the past, but this one most definitely qualifies as a hack. [Cnlohr] noticed that the ESP8266, when overclocked, could operate the IIC port at around 80MHz and still not lose DMA data. He worked out how to create bit patterns that generate RF around 60MHz. Why is that interesting? Analog TVs can receive signals around that frequency on channel 3.
As you can see in the video below, the output is monochrome only and is a little snowy. It also will lose frames on some WiFi events, but this is all forgivable when you consider this very inexpensive module isn’t meant to do video output at all.
You’ll see in the video that the overclocked ESP8266 is quite capable. It draws text, 2D shapes, and even multiple 3D shapes. Oh, it also is serving out a web page at the same time. If you want to try it yourself, just solder a wire to the RX pin on the device and load up the code from GitHub.
This isn’t the first time (or even the second time) we’ve seen [Cnlohr]. His YouTube channel has everything from using WebSockets on the ESP8266 to a minuscule Minecraft server. Definitely worth a look.
Thanks to [Rodrigo Pereira], [Tobias], and [Lucas] for the tip!
Filed under: video hacks, wireless hacks
Calling all Bay Area Belters: come hang out with fellow fans of The Expanse!
Anderson Dawes runs the OPA on Ceres Station. His belter accent—multilingual slang delivered by Jared Harris with an accent that wouldn't sound out-of-place in Attack the Block—is a joy to listen to. (credit: SyFy)
Attention all would-be OPA members: Du sif wang wit milowda fo yam seng unte revelushang! (Translation—join us for drinks and revolution!)
This Wednesday, February 3, 2016, come join Ars’ Tech Culture Editor Annalee Newitz and me at Longitude bar in downtown Oakland, California. Not only will you be among friends and fellow fans of The Expanse, but you’ll be able to hang out and learn Belter from the man who created it—Nick Farmer, the language consultant for the show.
Farmer is well-trained in many languages, including Swedish, Spanish, and a smattering of others to various degrees. At Longitude, he'll give all of us a basic lesson in Belter 101—a fascinating and poorly-understood (at least by us Earthers) creole.
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This Birdhouse Is the Perfect Intro to Autodesk 123D
Design a simple birdhouse using Autodesk 123D.
The post This Birdhouse Is the Perfect Intro to Autodesk 123D appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.
Facebook prohibiting private firearms sales from unlicensed dealers
(credit: Franco Bouly)
The social-networking site Facebook, and its Instagram photo-sharing service, are prohibiting person-to-person firearms transactions and related firearms advertising on the popular platforms.
The Friday move comes almost a month after President Barack Obama announced an executive initiative requiring those selling guns—whether at a flea market or online—to register as a firearms dealer and to perform background checks on gun purchasers. The White House has urged Silicon Valley to bake encryption backdoors into its wares, and has also urged social media companies to make it difficult for unlicensed gun dealers to sell firearms on their networks. Silicon Valley, however, has publicly balked at calls for encryption backdoors. Facebook's changeover is part of its updated terms of service that also prohibit its 1.6 billion monthly visitors from selling marijuana, pharmaceuticals and illegal drugs.
The company will remove posts reported by its users that violate the policy, which had already prohibited firearms sellers from promoting "no background checks required." Licensed dealers, which by law must perform background checks, may still advertise as long as transactions occur outside Facebook properties. Minors have already been shielded from seeing pages advertising guns. Repeat violators of Facebook's policy, designed to clamp down on unregulated gun sales, could be banned from the social network.
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Hacking the Internet of Things: Decoding LoRa
Getting software-defined radio (SDR) tools into the hands of the community has been great for the development and decoding of previously-cryptic, if not encrypted, radio signals the world over. As soon as there’s a new protocol or modulation method, it’s in everyone’s sights. A lot of people have been working on LoRa, and [bertrik] at RevSpace in The Hague has done some work of his own, and put together an amazing summary of the state of the art.
LoRa is a new(ish) modulation scheme for low-power radios. It’s patented, so there’s some information about it available. But it’s also proprietary, meaning that you need a license to produce a radio that uses the encoding. In keeping with today’s buzzwords, LoRa is marketed as a wide area network for the internet of things. HopeRF makes a LoRa module that’s fairly affordable, and naturally [bertrik] has already written an Arduino library for using it.
So with a LoRa radio in hand, and a $15 RTL-SDR dongle connected to a laptop, [bertrik] got some captures, converted the FM-modulated chirps down to audio, and did a bunch of hand analysis. He confirmed that an existing plugins for sdrangelove did (mostly) what they should, and he wrote it all up, complete with a fantastic set of links.
There’s more work to be done, so if you’re interested in hacking on LoRa, or just having a look under the hood of this new modulation scheme, you’ve now got a great starting place.
Filed under: radio hacks
Shootout redux: Smartphone camera vs tricked-out DSLR, one year later
Enlarge / Was this image taken with an iPhone or a DSLR? Spoiler: this one's from a DSLR, on a tripod, with a long exposure and a fair amount of post-processing. This is Gordon Cooper's "Faith 7" Mercury capsule, on display at Space Center Houston. (credit: Lee Hutchinson)
"The best camera," goes the old saying, "is the one you have with you." It’s true, too—spend just a few minutes browsing places like /r/pics and you’ll find stunning image after stunning image taken on a wide variety of cameras, from DSLRs with telephoto lenses all the way down to smartphones. A modern smartphone is equipped with a hell of a lot of picture-taking power and can spit out pro-looking images without a whole lot of effort, and nearly everyone has one on them all the time. Does that mean, then, that the best camera today is a smartphone?
We explored this in our October 2014 "iPhone vs. DSLR" shootout—and we learned a lot. The first lesson was, at least according to a whole lot of people, that I suck at photography. And that’s all right—I do suck at photography. Most of the images I take are properly called "product photography," done inside in studio conditions with lots of lights and not necessarily a lot of variation in settings. Shooting in the real world is a lot more complicated.
More importantly, we proved conventional wisdom right. A smartphone does take awesome pictures, so you don’t need a DSLR, two bags of gear, and a tripod unless you really need an expensive DSLR, two bags of gear, and a tripod.
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The Infinite Monkey Cage and General Relativity
If you are British, you probably already know where this is going. For the rest of you, it might help to know that The Infinite Monkey Cage is an odd little show on BBC 4 (and they’ve been on tour, too). It is the show that asks a question you probably never asked: “What would happen if a physicist and a comedian had a radio show?”
The answer, it turns out, is some science information that is anything but dry. If you are prone to listening to radio programs or podcasts, you might find some interesting tidbits in the Cage. A two-part episode on general relativity was especially interesting although it isn’t exactly like their regular program.
The physicist in question is [Brian Cox] who is an Advanced Fellow of particle physics at the University of Manchester. The comic, [Robin Ince] is not only a comedian, but also a writer, an impressionist, and has an honorary doctorate from Royal Holloway, University of London.
If you poke around the BBC’s site, you can find plenty of episodes to stream or download. General relativity is just one of the topics. You might also enjoy episodes on artificial intelligence or the science of sound.
If you need more comedy connections, consider that [Eric Idle] is responsible for the theme song. Of course, we cover relativity (and other topics) in a hopefully amusing style. Americans typically get British humor, or they don’t. There’s no in between. The good part about these is that if you don’t get the humor, there’s still the science content. Contrast this to the very funny (if you get it) Look Around You series that is probably not the best place to get scientific information (see the video below).
Filed under: podcasts
How a Hacker Jump Starts a Car
Here’s the Scenario: you need to get to get somewhere in a hurry. The problem is that your car has a dead battery and won’t turn over. The Obvious solution would be to call a friend for a jump. But is the friendless hacker out of luck in such a situation? Not if you can whip up a quick parts bin jump starter.
Clearly, [Kedar Nimbalkar]’s solution would be practical only under somewhat bizarre circumstances, so we’ll concentrate on what we can learn from it. A spare PC power supply provides the electrons – [Kedar]’s 250W supply pushes 15A at 12 volts, which is a pretty respectable amount of current. The voltage is a little anemic, though, so he pops it up to 14.2 volts with a 150W boost converter cooled with a PC fan. A dual panel meter reads out the voltage and current, but a VOM could substitute in a pinch. About the only thing you might not have on hand is a pair of honking 10A diodes to keep current from creeping back into the boost converter. [Kedar] claims he got enough of a charge back in the battery in five minutes to start his car.
As jump-starting goes, this hack is a bit of a stretch. It’s not the first time we’ve seen a MacGyver’d jump starter, though, and you never know when the principles and hardware behind these hacks will come in handy.
Filed under: car hacks, misc hacks
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