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[Diyguypt] may be an altruist to provide the means for people who can’t manipulate chess pieces to play the game. Or he may just have his hands too busy with food and drink to play. Either way, his voice command chessboard appears to work, although it has a lot of moving parts both figuratively and literally. You can check out the video below to see how it works.
The speech part is handled by an Android phone and uses Google’s voice services, so if you don’t want Google listening to your latest opening gambit, you’ll want to pass this one up. The phone uses an app that talks to the Arduino via Bluetooth, which means the Arduino needs a Bluetooth module.
The Arduino controls what amounts to an upside-down 3D printer. Instead of a hot end pointing down, the mechanism has an electromagnet pointing up. A small washer in the base of each chess piece makes it susceptible to the magnet’s motion. The electromagnet is required to let go of a piece before a move to a new position. It is possible that a small servo moving a permanent magnet closer to the board for a move and away from the board to reposition could do the same job, though we suspect that could be tricky.
We’ve seen this before, often with a Harry Potter theme. We sort of prefer a more obvious chess robot, but that’s just us.
Athletes have a long history of using whatever they can find to enhance their performance or improve their training. While fitness tracker watches are nothing new, swimmers have used them to track their split times, distance, and other parameters. The problem with fitness trackers though is that you have to look at a watch. FORM has swim goggles that promise to address this, their smart goggles present the swimmer with a heads-up display of metrics. You can see a slick video about them below.
The screen is only on one eye, although you can switch it from left to right. The device has an inertial navigation system and is — of course — waterproof. It supposedly can withstand depths up to 32 feet and lasts 16 hours on a charge. It can use Bluetooth to send your data to your phone in addition to the display.
All this comes at a price, the goggles cost about $200. These aren’t the goggles from the dollar store, but even a nice pair of Speedo goggles might run $30 tops.
The device reportedly tracks split time, interval time, rest time, total time, stroke rate and count, distance per stroke, pacing, distance, length count, and even calories burned.
This reminds us of Google Glass. Most similar displays we’ve seen however have been automotive.
[Practical Engineering] is ready to explain how power substations get electricity to you in his latest video, which you can see below. One of the things we always notice when talking to people either in our community or outside it is that most people have no idea how most of the modern world works.
Ask your non-technical friend to explain how a cell phone works or how a hard drive stores data and you aren’t likely to get a very good answer. However, even most of us are only focused on some particular aspect of electronics. There are a lot of people who hack on robots or radios. The AC power grid,though isn’t something a lot of people work with as a hobby. Do you know exactly what goes on in that substation you pass every day on your commute? If you don’t, you’ll learn something in the video.
Sure we know what transformers and breakers are. But do you know what a recloser is? Do you know all the different functions a substation might have? If not, the video is for you.
If you want to learn more about the kinds of wires you see overhead, we’d did that earlier. In fact, we had a whole series on the electric grid, smart and otherwise.
Compared to the simple diode needed to demodulate AM radio signals, the detector circuits used for FM are slightly more complicated. Wrapping your head around phase detectors, ratio detectors, discriminators, and quadrature detectors can be quite an exercise. There’s another demodulation method that’s not so common, but thankfully it’s also pretty easy to understand: the pulse counting detector.
As [Allan (W2AEW)] notes in the video below, pulse counting is a bit of a misnomer. Pulse counting works by generating a narrow, fixed-width square wave pulse at a set point in the received FM signal’s waveform, usually at the zero-crossing point. Since the frequency of the modulated carrier changes, the duty cycle of the resulting pulse train varies. That means there will be a fixed number of pulses, but by taking the average voltage of the pulse train, we can tease out the original audio frequency signal.
Simple in theory is often more complicated in practice, and [W2AEW] goes into some detail about those complications, such as needing to use a down-converter to make the peak-to-peak frequency deviation in the pulse train more easily detectable. As is his style, he walks us through a test circuit to prove that the theory works in practice. A simple two-transistor circuit generates the pulses at the zero-crossing point, a low-pass filter cleans up the signal, and a cheap audio amplifier reproduces the original audio. It’s a crude circuit to be sure, relying on the stray capacitance of the breadboard to work, but it proves the point and serves as a jumping-off point for further experiments – perhaps using an Arduino to count the pulses?
We always enjoy [W2AEW]’s videos and learn a lot from them. Not long ago we featured another of his videos talking about the mysteries of RF modulation; SSB, anyone?
If you're driving in San Francisco one week and then New York City the next, you're probably not paying attention to the small differences in rules when it comes to sharing bikes lanes, passing school buses, and turning right on red.
If you're in a self-driving car, those state-by-state distinctions aren't just a nuisance (and potential ticket since ignorance isn't a legal defense), but rules the self-driving companies don't want to overlook, no matter how tedious. The software controlling the car needs to have those slight variations in traffic law programmed in, especially since companies don't want negative media attention or a blemished record showing it broke the law. Read more...
More about Aurora, Autonomous Vehicles, Self Driving Cars, Tech, and TransportationIt wasn’t that long ago when hard drives that boasted a terabyte of capacity were novel. But impressive though the tera- prefix is, beyond that is peta and even further is exa — as in petabyte and exabyte. A common i7 CPU currently clocks in at about 60 gigaflops (floating point operations per second). Respectable, but today’s supercomputers routinely turn in sustained rates in the petaflop range, with some even faster. The Department of Energy announced they were turning to Cray to provide three exascale computers — that is, computers that can reach an exaflop or more. The latest of these, El Capitan, is slated to reach 1.5 exaFLOPS and will reside at Lawrence Livermore National Laboratories.
The $600 million price tag for El Capitan seems pretty reasonable for a supercomputer. After all, a Cray I could only do 160 megaflops and cost nearly $8 million in 1977, or about $33 million in today’s money. So about 20 times the cost gets them over 9,000 times the compute power.
The computes use Cray’s Shasta architecture. Of course, at some point, it isn’t the computing but the communications which provides the limiting factor. Cray’s Slingshot connects the pieces of the computer together. The information about it on Cray’s website isn’t very technical, but we were struck with this passage:
Additionally, Shasta supports processors well over 500 watts, eliminating the need to do forklift upgrades of system infrastructure to accommodate higher-power processors.
We know we hate it when we want to upgrade our desktop and have to start up the forklift. Cray, of course, has a long history with supercomputers. You probably have a pretty good supercomputer hiding in your graphics card, by the way.
If you weren't lining up for some kind of fried chicken product this week, were you even living?
First Popeye's sandwiches sold out. Now KFC has proved that whether the chicken is the real thing or not, people will queue for that finger-lickin' deliciousness.
The Colonel went plant-based at one Atlanta restaurant on Tuesday, complete with its signature red trim wrapped in bright green, to test out its Beyond Meat fake Fried "Chicken" on real humans.
And the real humans lined up literally around the block for the popcorn chicken and "wings", until supply ran out less than five hours into the promotion. Read more...
More about Kfc, Vegan Food, Meat Substitute, Beyond Meat, and LifestyleTaylor Swift opened the 2019 VMAs with a performance of her single "You Need To Calm Down" — in which she famously, finally, Said Gay Rights. She picked up the Video For Good award for the clip, peppered with celebrities and icons of queer pop culture, but allowed her co-executive producer and BFF Todrick Hall to give that acceptance speech.
When she won the fan-voted Video Of The Year, however, she took the mic and proceeded to back up the video's message, surrounded again by Hall as well as other members of the YNTCD cast such as Trinity the Tuck and Jade Jolie.
"In this video, several points were made, so you voting for the video means that you want a world where we're all treated equally under the law, regardless of who we love, regardless of how we identify," she said. Read more...
More about Taylor Swift, Change.Org, Lgbtq Rights, Equality Act, and EntertainmentMany held out hope that the Bibas family might have still been alive. from BBC News https://ift.tt/eoylikQ