Wednesday, 31 July 2019
US accuses Chinese billionaire of evading $1.8bn in tariffs
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White House Finally Acknowledges Trump-Putin Phone Call During Democratic Debate
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Julián Castro Made the Best Case for Impeachment Yet
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Resident doctors on strike today against NMC Bill
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North Korean soldier defects after crossing DMZ, says South
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Customer who wants ‘non-Hindu’ food delivery boy changed gets biting reply
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What Protestors at Wednesday’s Debate Were Yelling at De Blasio, Booker, and Biden
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'Jane the Virgin' gives fans a perfectly sweet goodbye
As our beloved and recently unveiled narrator tells us at the top of Jane the Virgin's final episode, everything ends. Stories end, friendships end, relationships end, and we must come to terms with it.
Yet so often in real life – outside of telenovelas and the CW shows that honor them – things don't end. Chapters of our own lives draw to a close, but then things go on. You learn to live without the thing that ended, or with the new change. The endings we experience in letting go of television are unique because rarely in life do we have to let go of so many beloved people and places at once, never to hear from them again. Read more...
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Ping-Pong Ball Makes Great PID Example
It is a common situation in electronics to have a control loop, that is some sort of feedback that drives the input to a system such as a motor or a heater based upon a sensor to measure something like position or temperature. You’ll have a set point — whatever you want the sensor to read — and your job is to adjust the driving thing to make the sensor read the set point value. This seems easy, right? It does seem that way, but in realitythere’s a lot of nuance to doing it well and that usually involves at least some part of a PID (proportional, integral, derivative) controller. You can bog down in math trying to understand the PID but [Electronoobs] recent video shows a very simple test setup that clearly demonstrates what’s going on with an Arduino, a motor, a distance sensor, and a ping-pong ball. You can see the video below.
Imagine for a moment heating a tank of water as an example. The simple approach would be to turn on the heater and when the water reaches the setpoint, turn the heater off. The problem there is though that you will probably overshoot the target. The proportional part of a PID controller will only turn the heater fully on when the water is way under the target temperature. As the water gets closer to the right temperature, the controller will turn down the input — in this case using PWM. The closer the sensor reads to the setpoint, the lower the system will turn the heater.
For some applications, this is enough. But what if there are very small errors? Perhaps the set point is 90 degrees and you are 89.8. That won’t correct quickly in a proportional-only control loop because the heater won’t be on very much due to the small error. The integral part of the loop will react to small errors over time, adding a small bit each time the system isn’t in the right state. The derivative part is the opposite. It affects the output in reaction to sudden changes such as an ice cube landing in the tank.
The example rig is a seesaw-like balance beam and uses a lot of 3D printed parts and some plywood. The input driver to the system is an RC servo that can tip the seesaw to a different angle. An IR sensor determines how far the ping-pong ball is from the edge of the beam. With everything wired to the Arduino, you have a pretty good testbed for a controller.
If is common to “tune” a PID by setting Kp, Ki, and Kd constants that determine the “strength” of each action. With the beam, you can watch how tuning affects the system. By setting a constant to zero you can turn off that part of the algorithm, and it is very instructive to see what each part of the equation does to the ping-pong ball.
Even if you have used PID before, you will enjoy seeing this illustrative demo. It would be great in the classroom. If you want to see a temperature example, we’ve seen that done with an Arduino, too. PID is integral — sorry — to flight control systems and self-balancing robots, too.
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Kelly Craft: Congress confirms UN ambassador pick
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Fears stoke backlash against Venezuelans in Peru
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VG Siddhartha: The man who brought coffee culture to India
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US-China trade war: 'We're all paying for this'
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What are the US's intentions in Africa?
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With Fiction, Chuck Klosterman Has Recaptured That Elusive “Raw Realness”
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Tuesday, 30 July 2019
Jaypee Infra insolvency: NCLAT permits fresh bids
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CEOs seek emotional anchors against stress
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Unnao rape case: Truck owner is kin of former SP neta
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Unnao rape survivor mishap: 'Truck skidded, hit car'
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After Loss to Arizona, Yankees Have Dropped Six of Nine Games
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Brexit and Boris Johnson Send the British Pound on a Slide
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Not being bullied by Virat and Shastri: Prasad
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Regional parties divorce Cong in RS Talaq battle
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'Rs 500cr farm income got I-T relief sans verification'
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VG Siddhartha: Body found in search for Cafe Coffee Day tycoon
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Prithvi Shaw suspended for doping violation
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Body of CCD founder VG Siddhartha recovered from Nethravathi river
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Electrocution kills nearly 30 Indians a day
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Decomposed body of CCD founder recovered from Nethravathi river
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Four Years Of Learning ESP8266 Development Went Into This Guide
The ESP8266 is a great processor for a lot of projects needing a small microcontroller and Wi-Fi, all for a reasonable price and in some pretty small form factors. [Simon] used one to build a garage door opener. This project isn’t really about his garage door opener based on a cheap WiFi-enabled chip, though. It’s about the four year process he went through to learn how to develop on these chips, and luckily he wrote a guide that anyone can use so that we don’t make the same mistakes he did.
The guide starts by suggesting which specific products are the easiest to use, and then moves on to some “best practices” for using these devices (with which we can’t argue much), before going through some example code. The most valuable parts of this guide especially for anyone starting out with these chips are the section which details how to get the web server up and running, and the best practices for developing HTML code for the tiny device (hint: develop somewhere else).
[Simon] also makes extensive use of the Chrome developers tools when building the HTML for the ESP. This is a handy trick even outside of ESP8266 development which might be useful for other tasks as well. Even though most of the guide won’t be new to anyone with experience with these boards, there are a few gems within it like this one that might help in other unrelated projects. It’s a good read and goes into a lot of detail about more than just the ESP chips. If you just want to open your garage door, though, you have lots of options.
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North Korea fires two ballistic missiles: Seoul
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BSY junks Tipu event, reverses Congress move
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Snapchat trolls Instagram with 'real friends' ad campaign
Snapchat is finally growing again, and it's using that momentum to engage in some (not so) subtle trolling of its biggest rival: Instagram.
Snap introduced a new ad campaign that's all about promoting Snapchat as the home for "real friends." The implications, of course, being that other platforms aren't about "real friends." Think that's too subtle? Well, just in case there was any question of what they really meant, Snap kicked off the campaign. on none other than Instagram.
Snap doesn't have its own presence on Instagram, so it worked with dozens of "quotefluencers" — high-profile accounts that primarily post inspirational quotes. Together, these accounts flooded Instagram with cheery quotes about friends using the "#realfriends" and "#friendshipquotes" hashtags. The posts were all on a yellow background, complete with Snapchat's ghost logo and "brought to you by Snapchat" captions. Read more...
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How Can Old Political Campaigners Advise 2020’s Democratic Contenders?
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Ten Democrats line up in second presidential TV debate
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Monday, 29 July 2019
Clean chit for pilot in sexual assault case
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Unnao rape: India murder probe over fatal crash
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Google remembers India's first woman legislator
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Senate fails to overturn Saudi arms sale veto
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Kohli slams Rohit rift reports as 'baffling, untrue'
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Pakistan military plane crashes in residential area killing 15
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Where The Work Is Really Done – Casual Profiling
Once a program has been debugged and works properly, it might be time to start optimizing it. A common way of doing this is a method called profiling – watching a program execute and counting the amount of computing time each step in the program takes. This is all well and good for most programs, but gets complicated when processes execute on more than one core. A profiler may count time spent waiting in a program for a process in another core to finish, giving meaningless results. To solve this problem, a method called casual profiling was developed.
In casual profiling, markers are placed in the code and the profiler can measure how fast the program gets to these markers. Since multiple cores are involved, and the profiler can’t speed up the rest of the program, it actually slows everything else down and measures the markers in order to simulate an increase in speed. [Daniel Morsig] took this idea and implemented it in Go, with an example used to demonstrate its effectiveness speeding up a single process by 95%, resulting in a 22% increase in the entire program. Using a regular profiler only counted a 3% increase, which was not as informative as the casual profiler’s 22% measurement.
We got this tip from [Greg Kennedy] who notes that he hasn’t seen much use of casual profiling outside of the academic world, but we agree that there is likely some usefulness to this method of keeping track of a multi-threaded program’s efficiency. If you know of any other ways of solving this problem, or have seen causal profiling in use in the wild, let us know in the comments below.
Header image: Alan Lorenzo [CC BY-SA 3.0].
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Cafe Coffee Day founder VG Siddhartha missing
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The Two-Party System Was Never Great, But Under Trump, It’s Completely Broken.
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A Dethroned Beauty Queen Signed On to Trump’s Reelection Campaign. What Is the “Women for Trump Coalition,” Exactly?
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Boko Haram: A decade of terror explained
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Who is ASAP Rocky and why is he on Trump's radar?
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Pakistani military aircraft crashes, 17 killed
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100 million Americans' data accessed in massive Capitol One hack
Well, this is not good.
Finance services giant Capital One announced Monday that there had been a major cybersecurity incident directly affecting 100 million Americans and six million Canadians. Specifically, a host of their customers' private financial data had been accessed by a hacker.
According to a statement issued by the company, two separates breaches occurred — once on March 22 and another on March 23 — and were discovered on July 19.
Bloomberg reports that a Seattle woman has been arrested and accused of hacking Capital One's server at an unnamed cloud-computing company.
Notably, it seems that although the customer data in question was encrypted, the hacker was able to decrypt it. Read more...
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Capital One data breach: Arrest after details of 100m US individuals stolen
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'I've spent 22 years searching for silver in a ghost town'
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US election 2020: Do front-runners win their party's nomination?
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Is routine genetic profiling coming closer?
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When in college, I helped father in field: Sivan
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Doctors' crowdfunded hospital brings hope in Syria
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Unitech goes Amrapali way, SC asks NBCC to finish 74 projects
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Sunday, 28 July 2019
Facebook Connected Her to a Tattooed Soldier in Iraq. Or So She Thought.
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While Reporting on Facebook Scams, an Unexpected Tragedy
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Russi Taylor, the Voice of Martin Prince and Minnie Mouse, Dies at 75
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Shooter reported at California garlic festival
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John Ratcliffe, Nominee for Intelligence Chief, Is Seen as Staunch Trump Ally
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Quotation of the Day: House Democrats Head Into Their August Recess With a Mixed Record
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Megan Rapinoe, Conquering Hero, Returns to Cheers but Not to Action
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Mets, Riding High Off Sweep, Trade for Marcus Stroman
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ESP8266 Sound Machine Soothes Baby Remotely
[Zack] had trouble getting his six-month-old to sleep through the night. That was before he found out about ‘shh’ videos on YouTube. These are exactly what they sound like: eight hours of someone whooshing white noise into a microphone. He set a phone up on a charger in the nursery and let one of these play overnight. But the phone was unreliable. It would lock up, or just crash completely, making the baby’s distress worse.
To restore peace in the house, he built a sound machine that both simplifies and fortifies the white noise shh-loution. It uses an ESP8266 and a DFPlayer Mini to loop a lone MP3 file of shh-video audio and play it from a small speaker. By integrating the machine with Home Assistant, he’s able to trigger the sound remotely at baby’s bedtime. ESP Home has no module for the DFPlayer, but [Zack] built one that he’s happy to share.
If you are mired in early parenthood, this is a nice, simple solution. The DFPlayer does all the work of reading from the SD card and converting the signal to analog for speaker output, so there’s no need to get your hands dirty wasting valuable sleeping or kid-playing time.
Once the kid starts toddling out of babyhood, [Zack] could turn to ESP8266-based ambient lighting to help establish the difference between sleep and wake time.
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Trump says US intel to leave office August 15
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MP: Teachers posted as clerks to Cong, BJP MLAs
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The U.S. and Guatemala Reached an Asylum Deal: Here’s What It Means
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Nigeria Militants Attack Mourners, Killing at Least 65, Officials Say
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Baltimore to Trump: Knocking Our City Is Our Job, Not Yours
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Bernie Sanders Goes the Extra Mile to Make His Point About Drug Prices
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Trump Is Different Than George Wallace. He’s Worse.
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Jay Inslee: Climate Change Is a Winning Campaign Issue — and President Trump Knows It
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The Golden Girls Would Violate Zoning Laws
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Saturday, 27 July 2019
My son was not at peace as CM: Deve Gowda
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Russi Taylor: Minnie Mouse voice actress dies aged 75
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Stay away from government matters, BS Yediyurappa kin told
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Red alert in Mumbai for today and Monday
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Quotation of the Day: Clashes and Tear Gas as Hong Kong Police Confront Protesters
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India U-19 footballers panic, jump off cable car
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Senior Congress leader Jaipal Reddy passes away
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Miners Kill Indigenous Leader in Brazil During Invasion of Protected Land
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What new amendments mean for RTI Act
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The Yankees and Their Terrible, Horrible, No-Good, Very Bad Week
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Fifth N.Y.P.D. Officer Since June Dies by Suicide, Police Say
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Build Your Own LED Glow Poi
Spinning poi is an entertaining pastime, and LEDs can make a great addition to the experience. [MilanDer] built some LED poi of their very own, using a few maker staples along the way.
A 3D printed enclosure is first created, using “clear” PLA that in practice produces translucent white parts. This acts as a great diffuser for the APA102 LEDs inside. The LEDs are driven by an Arduino Pro Mini, which is fitted inside the enclosure along with a buck-boost converter, lithium battery and charge board. Finally, a strap is added to allow the poi to be spun easily by the user.
The visual effect is great, and through the use of an infrared receiver, the poi can be remotely controlled to deliver different RGB animations at the touch of a button. We’d love to see a group of spinners with synchronized colored poi thanks to a master controller, and this hardware would be more than capable of the task.
We’ve seen some advanced networked Poi before, too. If you’ve got a great LED build, be sure to let us know.
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Judge orders Agra cop to ‘strip’ in courtroom
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Get a First Look at Transparent’s All-Talking, All-Singing, All-Dancing, No-Jeffrey-Tambor Musical Finale!
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French cyclists hit again by curse of Tour de France
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Coco Gauff Draws a Crowd Even Without Wimbledon’s Pageantry
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U.S.A. Basketball Will Pay Some Women’s Players Ahead of Olympics
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Friday, 26 July 2019
Jofra Archer: England paceman in 'excruciating' pain during World Cup
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BCCI letter helps Mohammed Shami get US visa
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Jazzberry Bakes The Pi Into A Mechanical Keyboard
If you hang around Hackaday long enough, pretty soon you’ll start to see some patterns emerging. As the nexus of all things awesome in the hacking world, our front page offers a unique vantage point by which you can see what’s getting folks excited this particular month, year, or decade. Right now we can tell you hackers love the Raspberry Pi, 3D printing, and perhaps above all, they can’t get enough mechanical keyboards.
So that makes the Jazzberry by [Mattis Folkestad] something of a perfect storm in the hacker world. The project uses a 3D printed enclosure to combine a Raspberry Pi 3B+ and an Ajazz AK33 mechanical keyboard into a single unit like the home computers of old. Honestly, we’re just glad he didn’t sneak an ESP8266 in there; as the resulting combination might have been enough to crash the site.
That being said, we can’t help but notice there’s a lot of open space inside the 3D printed enclosure. Right now there’s nothing inside but the Raspberry Pi, which only takes up a fraction of the internal volume. Adding a battery and hard drive would be the logical next steps, but it could also be outfitted with a suite of radios and various other hacking and security research accoutrements. We’ve seen an influx of such builds over the last few months, and the Jazzberry seems like it could make a very slick entry into this burgeoning category of mobile pentesting devices.
The STL files are designed specifically for the combination of hardware that [Mattis] used, but it shouldn’t be too difficult to modify them for your own purposes. Even if you stick with the same AK33 keyboard, an upgrade to the impressively powerful Raspberry Pi 4 would be more than worth the time fiddling with the STLs in your CAD tool of choice. If you really want to go all in, add a display and you’re well on the way to that cyberdeck you’ve always wanted.
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Zack Wheeler Is Sharp for the Mets as He Returns From Injury
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Mookie Betts’s 3 Homers Lead Another Red Sox Demolition of the Yankees
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2 Class IX kids extort Rs 3 lakh from classmate
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High score, fee push med students to Russia, China
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Hong Kong Protests: Site of Mob Attack Is Demonstrators’ Next Stop
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How a midnight call from Amit Shah greenlighted BS Yediyurappa's plan
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US approves sales to support Pakistan's F-16 jets
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Rohit unfollows Anushka, sparks rift rumours
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Philippines earthquakes kill at least six
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Nightclub collapse kills two in South Korea
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Add Scripting To Your C++ Programs With ChaiScript
If you are writing a program that has a technical user base, it is a nice touch to make the program scriptable. In fact, you might want to do the hard work in a programming language and then use your scripting language to build out features. In theory, this should be easy. There are plenty of embedded scripting libraries and they provide some way for your code to access script resources and for script resources to access selected host variables and functions. If you use C++, one of the easier ways to do this is with ChaiScript.
ChaiScript is BSD licensed and — assuming your compiler supports C++ 14 — it is as easy as including a header file and making a few calls. There are no special tools or libraries required. The code is portable between operating systems, including both 32-bit and 64-bit Windows. It is also threadsafe unless you turn that feature off.
How simple is ChaiScript? Here’s their example of exposing a function (HelloWorld, of course). The function takes an argument and returns a value. The main program sets up the link between the function and script and then runs a simple script.
#include <chaiscript/chaiscript.hpp> std::string helloWorld(const std::string &t_name) { return "Hello " + t_name + "!"; } int main() { chaiscript::ChaiScript chai; chai.add(chaiscript::fun(&helloWorld), "helloWorld"); chai.eval(R"( puts(helloWorld("Bob")); )"); }
A real program is probably more likely to read its script from a file or some other user-specified thing, but that’s easy enough to imagine. According to the documentation, your script can call C++ and C++ can call into scripts and all in a type-safe manner. You can also propagate exceptions.
The scripting language itself is straightforward. Instead of the formal documentation, you might appreciate the cheat sheet. There are also quite a few examples.
It is easy to dismiss scripting languages, but they are perfect for some applications. ChaiScript and similar tools let you build the hard parts the hard way and the easy parts the easy way. After all, you probably use bash and it is nothing more than a scripting language.
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Nightclub collapse kills two in South Korea
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Syrian girls captured in viral photo fight for survival
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Thursday, 25 July 2019
Vijay Diwas: Remembering Kargil heroes
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Brazil gold heist: Gunmen steal gold worth $30m from São Paulo airport
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SC bench-fixing: Probe panel finds 'some truth'
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Austria orders arrest of Russian in colonel spying case
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Faruk Orman: Murder conviction quashed in Australia 'Lawyer X' scandal
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Can going caste-free in Haryana be a reality?
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Dhoni on patrol duty in J&K from July 31
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'Moulin Rouge!' on Broadway is one hell of a fun spectacle
The spectacle of Moulin Rouge! begins not with the opening number, but from the moment you walk into the glamorous, immersive theater decked out with a giant windmill on one side and a larger-than-life elephant on the other. Then, as you actually focus on what is on the stage, you're greeted with seductive dancers strutting around in their burlesque best, making eyes at patrons as they find their seats and begin to even attempt to take in all the wonder around them.
Welcome to the Moulin Rouge.
This bombastic, enchanting and altogether magical Broadway musical, based on the Oscar-nominated 2001 film of the same name by Baz Lurhmann, is a love letter to love, most especially the all-consuming, desperate kind of love that songwriters have been trying to put into words over and over again for centuries. Read more...
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Deducing Stepper Motor Wiring
There are a lot of fun projects you can do with stepper motors salvaged from old printers or disk drives. However, it isn’t always clear how to connect to some strange motor with no markings or schematics. [Corvetteguy50] has a video showing his trick for working out the connections easily, and you can see it below.
The basic idea is simple. Using a special jig, he connects an LED across two random pins and spins the motor. If the LED lights, you’ve found a coil. You just don’t know which coil, yet. You can also short two wires and note when you feel resistance when you spin the shaft.
This gets a little trickier with some motor types, for example those that have encoder outputs which won’t do anything to drive the motor. Others have a case ground wire. Steppers have either 4, 5, 6, or 8 drive wires so if you have one more than any of those numbers it is likely a ground wire.
There are other ways to identify the pinout, especially if the motor has 4 or 6 wires. For a 4 wire motor, you can measure resistance until you find a pair that read a relatively low resistance. Then you simply have to guess which one is A and which is B. If you guess wrong, the motor will spin backward, as these are bipolar motors.
For a 6 wire device, the extra two wires are center taps and a 5 wire motor will have both center taps tied together. Measuring resistance between two wires should give you one of three readings. If you read an open circuit, you are on two different coils. If you read a resistance, you can record it and measure some more pairs. The resistance readings will cluster around two different values. The pairs with higher values are the coil ends. The remaining two wires are the center taps and you can tell which is which by which end they are connected to. Of course, in a 5 wire motor you’ll only have one wire left. Those motors can only be used in a unipolar configuration, but a 6 or 8 wire motor can be either.
If you want more information on these kinds of motors, we’ve covered them a lot over the years. Manually controlling one is pretty informative, too. There’s also the classic Jones on Stepper Motors.
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