Archivi del mese: marzo 2020

Using A Vending Machine Bill Acceptor With Arduino

Using A Vending Machine Bill Acceptor With Arduino
By Tom Nardi

We’ve all seen, and occasionally wrestled with, bill acceptors like the one [Another Maker] recently liberated from an arcade machine. But have you ever had one apart to see how it works? If not, the video after the break is an interesting peak into how this ubiquitous piece of hardware tells the difference between a real bill and a piece of paper.

But [Another Maker] goes a bit farther than just showing the internals of the device. He also went through the trouble of figuring out how to talk to it with an Arduino, which makes all sorts of money-grabbing projects possible. Even if collecting paper money isn’t your kind of thing, it’s still interesting to see how this gadget works on a hardware and software level.

As explained in the video, a set of belts are used to pull the bill past an array of IR LEDs. The hardware uses these to scan the bill and perform some dark magic to determine if it’s a genuine piece of currency. [Another Maker] notes that these readers actually need to receive occasional firmware updates to take into account new bill designs. In fact, the particular unit he has is so out of date that it won’t accept modern $5 bills; which may explain how he got it for free in the first place.

Years ago we saw one of these bill acceptors used to make a DIY Bitcoin ATM. Of course back then, a few bucks would get you a semi-reasonable amount of BTC. These days you would skip the paper currency and do it all digitally.

March 31, 2020 at 10:00PM
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Chatty Coaster Agitates, In A Friendly Way

Chatty Coaster Agitates, In A Friendly Way
By Lewin Day

 

Awkward silences can be highly uncomfortable. Thankfully, they’re a problem that can be solved by technology. Chatty Coaster aims to do just this, detecting pauses in conversation and interjecting with helpful questions to move things along.

The coaster is built around an Arduino Micro, which uses a microphone to detect audio levels in the room. When it detects an extended silence, it then fires off a sound clip using a Sparkfun audio breakout board. The questions vary from plain to politically sensitive, so there’s a good chance you could get some spicy conversation as a result. Any talking device runs a risk of being more annoying than helpful, and there’s certainly a risk that Chatty Coaster could fall into this category. Choosing the right content seems key here.

Overall, while this may not be the ultimate solution to boring company, it could get a laugh or two and serves as a good way to learn how to work with audio on microcontrollers. Video after the break.

We’ll admit, when we were reading this one, we thought we had deja vu. But this one’s a lot less blamey.

March 31, 2020 at 08:30PM
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Perhaps August Dvorak Is More Your Type

Perhaps August Dvorak Is More Your Type
By Kristina Panos

One of the strangest things about human nature is our tendency toward inertia. We take so much uncontrollable change in stride, but when our man-made constructs stop making sense, we’re suddenly stuck in our ways — for instance, the way we measure things in the US, or define daytime throughout the year. Inertia seems to be the only explanation for continuing to do things the old way, even when new and scientifically superior ways come along. But this isn’t about the metric system — it’s about something much more personal. If you use a keyboard with any degree of regularity, this affects you physically.

Many, many people are content to live their entire lives typing on QWERTY keyboards. They never give a thought to the unfortunate layout choices of common letters, nor do they pick up even a whisper of the heated debates about the effectiveness of QWERTY vs. other layouts. We would bet that most of our readers have at least heard of the Dvorak layout, and assume that a decent percentage of you have converted to it.

Hardly anyone in the history of typewriting has cared so much about subverting QWERTY as August Dvorak. Once he began to study the the QWERTY layout and all its associated problems, he devoted the rest of his life to the plight of the typist. Although the Dvorak keyboard layout never gained widespread adoption, plenty of people swear by it, and it continues to inspire more finger-friendly layouts to this day.

Composer of Comfort

Image via @mwichary

August Dvorak was born May 5th, 1894 in Glencoe, Minnesota. He served in the US Navy as a submarine skipper in WWII, and is believed to be a distant cousin of the Czech composer Antonín Dvořák. Not much has been published about his early life, but Dvorak wound up working as an educational psychologist and professor of the University of Washington in Seattle, and this is where his story really begins.

Dvorak’s interest in keyboards and typing was struck when he advised a student named Gertrude Ford with her master’s thesis on the subject of typing errors. Touch typing was only a few decades old at this point, but the QWERTY layout had already taken a firm hold on the industry.

As Dvorak studied Ford’s thesis, he began to believe that the QWERTY layout was to blame for most typing errors, and was inspired to lead a tireless crusade to supplant it with a layout that served the typist and not the typewriter. His brother-in-law and fellow college professor, William Dealey, joined him on this quest from the beginning.

AOEUIDHTNS

Dvorak and Dealey put a great deal of effort into analyzing every aspect of typing, studying everything from frequently-used letter combinations of English to human hand physiology. In 1914, Dealey saw a demonstration given by Frank and Lillian Gilbreth, who were using slow-motion film techniques to study industrial processes and worker fatigue. He told Dvorak what he’d seen, and they adopted a similar method to study the minute and complex movements of typists.

In 1936, after two decades of work, Dvorak and Dealey debuted a new layout designed to overcome all of QWERTY’s debilitating detriments. Whereas QWERTY places heavy use on the left hand and forces fingers outside the home row over 60% of the time, the Dvorak layout favors hand alternation and keeping the fingers working at home as much as possible. In this new arrangement, the number of words that can be typed without leaving the home row increased by a few thousandfold. Dvorak and Dealey along with Gertrude Ford and Nellie Merrick published all of their psychological and physiological findings about typing in the now out-of-print Typewriting Behavior (1936).

The original Dvorak layout. From Typewriting Behavior via @rand.ferch

Haters Gonna Hate

Dvorak teaching in 1932. Image via The University of Washington

At first, it seemed as though the Dvorak-Dealey simplified layout had half a chance of supplanting QWERTY. Dvorak found that students who had never learned to touch type could pick up Dvorak in one-third the time it took to learn QWERTY.

Dvorak entered his typists into contests, and they consistently out-typed the QWERTYists by a long shot. It got so bad that within a few years, Dvorak typists were banned outright from competing. This decision was overturned not long after, but the resentment remained. QWERTY typists were so unnerved by the speed of the Dvorak typists that Dvorak typewriters were sabotaged, and he had to hire security guards to protect them.

The QWERTY is Too Strong

Although there were likely many factors at play, the simple fact is that by the time Dvorak patented his layout, Remington & Sons had cornered the market on typewriters. Even so, Dvorak released his keyboard during the Depression, and hardly anyone could afford to buy a new typewriter just because there was some hot new layout.

Although Dvorak typewriters were never mass-produced, they almost made waves thanks to the US Navy. Faced with a shortage of trained typists during WWII, they experimented with retraining QWERTY typists on Dvorak and found a significant increase in speed. They allegedly ordered thousands of Dvorak typewriters, but were vetoed by the Treasury department because of QWERTY inertia.

August Dvorak went on to make one-handed keyboards with layouts for both the left and right hand. In 1975, he died a bitter man, never understanding why the public would continue to shrug their overworked shoulders and keep using QWERTY keyboards. He might have been pleased to know that the Dvorak layout eventually became an ANSI standard and comes installed on most systems, but dismayed to find the general population still considers it a fringe layout.

I’m tired of trying to do something worthwhile for the human race. They simply don’t want to change!

March 31, 2020 at 07:00PM
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Reverse Engineering a Ceiling Fan Remote

Reverse Engineering a Ceiling Fan Remote
By Rich Hawkes

In the quest to automate everything in your home, you no doubt have things that aren’t made with home automation in mind. Perhaps your window AC unit, or the dimmer in your dining room. [Seb] has several ceiling fans that are controlled by remotes and wanted to connect them to his home automation system. In doing so, [Seb] gives a good overview of how to tackle this problem and how to design a PCB so he doesn’t have a breadboard lying around connected to the guts of his remote control.

There are several things [Seb] needs to figure out in order to connect his fans to Home Assistant, the home automation system he uses: He needs to determine if the circuit in the remote can be powered by 5 or 3.3 V, he needs to connect the circuit to an ESP32 board, and he needs to figure out if he can create a custom PCB that combines the circuit and the ESP32 into one. The video goes through each of these steps and shows the development of each along the way.

There’s a lot of info in the video, so it might need to be slowed down a bit to see all the details. There are some other reverse engineering of home automation gear on the site, here, or, you might want to build your own remote to control your automated devices.

March 31, 2020 at 05:30PM
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Behind The Scenes Of Folding@Home: How Do You Fight a Virus with Distributed Computing?

Behind The Scenes Of Folding@Home: How Do You Fight a Virus with Distributed Computing?
By Roger Cheng

A great big Thank You to everyone who answered the call to participate in Folding@Home, helping to understand proteins interactions of SARS-CoV-2 virus that causes COVID-19. Some members of the FAH research team hosted an AMA (Ask Me Anything) session on Reddit to provide us with behind-the-scenes details. Unsurprisingly, the top two topics are “Why isn’t my computer doing anything?” and “What does this actually accomplish?”

The first is easier to answer. Thanks to people spreading the word — like the amazing growth of Team Hackaday — there has been a huge infusion of new participants. We could see this happening on the leader boards, but in this AMA we have numbers direct from the source. Before this month there were roughly thirty thousand regular contributors. Since then, several hundred thousands more started pitching in. This has overwhelmed their server infrastructure and resulted in what’s been termed a friendly-fire DDoS attack.

The most succinct information was posted by a folding support forum moderator.

Here’s a summary of current Folding@Home situation :
* We know about the work unit shortage
* It’s happening because of an approximately 20x increase in demand
* We are working on it and hope to have a solution very soon.
* Keep your machines running, they will eventually fold on their own.
* Every time we double our server resources, the number of Donors trying to help goes up by a factor of 4, outstripping whatever we do.

Why don’t they just buy more servers?

The answer can be found on Folding@Home donation FAQ. Most of their research grants have restrictions on how that funding is spent. These restrictions typically exclude capital equipment and infrastructure spending, meaning researchers can’t “just” buy more servers. Fortunately they are optimistic this recent fame has also attracted attention from enough donors with the right resources to help. As of this writing, their backend infrastructure has grown though not yet caught up to the flood. They’re still working on it, hang tight!

Computing hardware aside, there are human limitations on both input and output sides of this distributed supercomputer. Folding@Home need field experts to put together work units to be sent out to our computers, and such expertise is also required to review and interpret our submitted results. The good news is that our contribution has sped up their iteration cycle tremendously. Results that used to take weeks or months now return in days, informing where the next set of work units should investigate.

Is this work actually useful?

In a word, yes. Folding@Home results are available to researchers at no cost, and this data has contributed to many published papers and even more in the pipeline. For more details on publishing see our earlier update, but there were a few new questions in this AMA beyond papers.

This global pandemic has attracted attention at all levels, so there are many other computational research projects running like AlphaFold and efforts at Oak Ridge National Laboratory. Folding@Home isn’t even the only distributed computing platform, with Rosetta@Home on BOINC also vying for time on people’s personal computers. Are we all just duplicating effort? The team assured us that we are not. All of these are complementary efforts attacking the challenge from different sides. They are coordinating with, not competing against, all of these other researchers.

They do acknowledge it’s hard to make their work understandable outside of medical researchers. But public outreach is something they very much want to improve upon. They haven’t found a way to condense such a complex field into a single tweet, but in the meantime they’ll settle for efforts like this eleven-part thread summarizing how Folding@Home helps drug discovery and development.

What does the future hold?

We’re big fans of open source here at Hackaday, and thankfully someone brought up that topic. There is intent to open-source the Folding@Home client but that hasn’t happened yet and obviously not their top priority at the moment. They hope opening their source will attract contributors to bring Folding@Home to more platforms. BOINC is an obvious candidate, and we can also think of upcoming powerful video game consoles with teraflops to spare. Software developers who have a newfound interest in this field can get started by looking over the existing open-source foundations: GROMACS for their CPU folding core, and OpenMM for their GPU folding core. Additional technical background can be found on the folding support forum.

We’d love to have you join in the effort, if you do, use the team code #44851 to track your stats as part of Team Hackaday. And, we encourage all participants to continue even after this specific crisis is over, whenever that may be. After the original SARS subsided, research attention withered and in hindsight that might have been a mistake. Yes, we need to focus on SARS-CoV-2 today, but researchers want a better general understanding of the whole family. It’s only a matter of time before SARS-CoV-3 (or whatever its name will be) makes its appearance, how prepared will we be? Your support of Folding@Home will continue to be valuable long after this pandemic has been retired to the history books.

[Main image source: Simulation of millisecond protein folding: NTL9 (from Folding@home)]

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March 31, 2020 at 04:01PM
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3D Metal Printer uses Welding Wire

3D Metal Printer uses Welding Wire
By Ted Yapo

If you’ve seen both a fused filament fabrication (FFF) printer and a wire welder, you may have noticed that they work on a similar basic principle. Feedstock is supplied in filament form — aka wire — and melted to deposit on the work piece in order to build up either welds in the case of the welder, or 3D objects in the case of the printer. Of course, there are a number of difficulties that prevent you from simply substituting metal wire for your thermoplastic filament. But, it turns out these difficulties can be overcome with some serious effort. [Dominik Meffert] has done exactly this with his wire 3D printer project.

Extruder cold end using a standard feeder roller

For his filament, [Dominik] chose standard welding wire, and has also experimented with stainless steel and flux-cored wires. Initially, he used a normal toothed gear as the mechanism in the stepper-driven cold end of his Bowden-tube extrusion mechanism, but found a standard wire feeder wheel from a welder worked better. This pinch-drive feeds the wire through a Bowden tube to the hot end.

In thermoplastic 3D printers, the material is melted in a chamber inside the hotend, then extruded through a nozzle to be deposited. Instead of trying to duplicate this arrangement for the metal wire, [Dominik] used a modified microwave oven transformer (MOT) to generate the low-voltage/high-amperage required to heat the wire restively. The heating is controlled through a phase-fired rectifier power controller that modulates the power on the input of the transformer. Conveniently, this controller is connected to the cooling fan output of the 3D printer board, allowing any standard slicer software to generate g-code for the metal printer.

To allow the wire to heat and melt, there must be a complete circuit from the transformer secondary. A standard welding nozzle matching the wire diameter is used as the electrode on the hot end, while a metal build plate serves as the other electrode. As you can imagine, getting the build plate — and the first layer — right is quite tricky, even more so than with plastic printers. In this case, added complications involve the fact that the printed object must maintain good electrical continuity with the plate, must not end up solidly welded down, and the fact that the 1450 °C molten steel tends to warp the plate.

Considering all the issues that have to be solved to make this all work, we are very impressed with [Dominik’s] progress so far! Similar issues were solved years ago for the case of thermoplastic printers by a group of highly-motivated experimenters, and it’s great to see a similar thing starting to happen with metal printing, especially using simple, readily-available materials.

This isn’t the only approach to DIY metal printing, though. We saw one that used electron beam melting (EBM) not too long ago.

Thanks to [Krzysztof] for the tip!

March 31, 2020 at 01:00PM
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Fail of the Week: In CAD, Remember to Model the Environment

Fail of the Week: In CAD, Remember to Model the Environment
By Donald Papp

What’s wrong with the above picture? Failure can be an excellent teacher, and [J. Peterson] reminds us all of this when he says to remember to model the environment when designing things in CAD. He contrasts a failure with a success to demonstrate what that means.

The failure was a stand for a screwdriver set, shown above. He modeled up a simple stand to hold a screwdriver handle and the bits in a nice, tight formation. He didn’t model any of parts, he just took some measurements and designed the holder. Everything fit just fine, but it had a major ergonomic problem: you can barely reach the handle because it is fenced in by the surrounding bits! Had he modeled all of the parts during the design phase, and not just the part he was making, this problem would have been immediately obvious during the design phase.

The contrasting success is an adapter he designed to mount an artistic glass marble to a lit display stand. The stand itself as well as the glass marble were modeled in CAD, then the adapter designed afterwards to fit them. With all of the involved objects modeled, he could be certain of how everything fit together and it worked the first time.

Now, to most people with a 3D printer of their own, discovering a part isn’t quite right is not a big (nor even a particularly expensive) problem to have, but that’s not the point. Waste and rework should be avoided if possible. To help do that, it can be good to remember to model the whole environment, not just the thing being made. Add it on to the pile of great design advice we’ve seen for designing things like enclosures and interfaces.

March 31, 2020 at 10:00AM
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