Hack A Soda Can Into Jewelry

November 9, 2023 by 11 Comments

If you’ve ever needed some aluminum for a project, you might have noticed you have easy access to aluminum cans. If you need a cylinder, fine. But what if you don’t? [ThescientistformerlyknownasNaegeli] shows how to create an attractive necklace from two soda cans, and we think the techniques might be usable for other cases where you might need aluminum. If you care more about the necklace, it looks good. You only have to add a 3D-printed clasp or, if you prefer, you can buy a clasp and use that. For the Hackaday crowd, you can also use the resulting structure as an aluminum cable shield, which might better suit you.

The post gives more details and points to other posts for even deeper dives into many of the steps. But the basic idea is you strip the ink from the outside of the can and then cut the can into a strip. The mechanism for that looks a lot like a machine to cut plastic bottles into strips, but that method isn’t feasible without special blades.

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Does Getting Into Your Garage Really Need To Be Difficult?

November 9, 2023 by 78 Comments

Probably the last thing anyone wants when coming home from a long day at work or a trip is to be hassled at the last possible moment — gaining entrance to your house. But for some home automation enthusiasts, that’s just what happened when they suddenly learned that their own garage doors had betrayed them.

The story basically boils down to this: Chamberlain, a US company that commands 60% of the garage door market, recently decided to prevent “unauthorized usage” of their MyQ ecosystem through third-party apps. Once Chamberlain rolled out the change, users of Home Assistant and other unauthorized apps found themselves unable to open or close their doors with the apps they were accustomed to.

Those of us with custom smart home setups can relate to how frustrating it is when something disturbs the systems you’ve spent a lot of time tweaking and optimizing. It’s especially upsetting for users who both Chamberlain hardware specifically because it was supported by Home Assistant, only to have the company decide to drop support. This feels like false advertising, but we strongly suspect that buried in the EULA users must have agreed to at some point is a clause that essentially says, “We can do anything we want and tough noogies to you.” And if you read through the article linked above, you’ll get an idea why Chamberlain did this — they probably didn’t like the idea that users were avoiding their ad-spangled MyQ app for third-party interfaces, depriving them of ad revenue and the opportunity for up-selling.

We feel the frustration of these users, but rather than curse the darkness, perhaps this will light a candle of righteous rage that leads to a clever workaround. The Home Assistant blog article mentions a dongle called ratgdo, which should allow any door with plain old dry contacts to work via MQTT or ESPHome. It’s extra work that users shouldn’t have to put in, but maybe getting one over on The Man would be worth the effort.

Thanks to [KC] for the tip; please keep us posted on your workaround.

Mining And Refining: Graphite

November 9, 2023 by 26 Comments

In my teenage years I worked for a couple of summers at a small amusement park as a ride operator. Looking back on it, the whole experience was a lot of fun, although with the minimum wage at $3.37 an hour and being subjected to the fickle New England weather that ranged from freezing rains to heat stroke-inducing tropical swelter, it didn’t seem like it at the time.

One of my assignments, and the one I remember most fondly, was running the bumper cars. Like everything else in the park, the ride was old and worn out, and maintenance was a daily chore. To keep the sheet steel floor of the track from rusting, every morning we had to brush on a coat of graphite “paint”. It was an impossibly messy job — get the least bit of the greasy silver-black goop on your hands, and it was there for the day. And for the first few runs of the day, before the stuff worked into the floor, the excited guests were as likely as not to get their shoes loaded up with the stuff, and since everyone invariably stepped on the seat of the car before sitting on it… well, let’s just say it was easy to spot who just rode the bumper cars from behind, especially with white shorts on.

The properties that made graphite great for bumper cars — slippery, electrically conductive, tenacious, and cheap — are properties that make it a fit with innumerable industrial processes. The stuff turns up everywhere, and it’s becoming increasingly important as the decarbonization of transportation picks up pace. Graphite is amazingly useful stuff and fairly common, but not all that easy to extract and purify. So let’s take a look at what it takes to mine and refine graphite.

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Programming 1949 Style!

November 9, 2023 by 28 Comments

What was it like to program an early digital computer? [Woven Memories] wanted to know and wants you to know, too. [Maurice Wilkes] and his team wrote a book about their EDSAC and the 18 instructions that it used. These days, you can even run an EDSAC program on a number of emulators.

It is hard to realize how things we take entirely for granted had to be invented by [Wilkes] and his colleagues. The book, “The Preparation of Programs for an Electronic Digital Computers” has, among other things, the first recorded use of a software library and the first API. Even the subroutine needed inventing by [Wilkes’] student [David Wheeler], which was known for a while as the “Wheeler Jump.”

Like many things in old computers, the Wheeler Jump required code to modify itself. Even indexing modes were often implemented by changing an address inside the program.

While we frown on techniques like this today, you have to start somewhere. We are big fans of EDSAC and [Dr. Wilkes] had a long and distinguished career long after EDSAC, too. The original plans for EINIAC led to EDSAC, EDVAC, and a slew of other early machines. You can see a video of the machine with an introduction by [Wilkes] below.

If you want to try your hand with the EDSAC, try your browser. There’s also a very nice Windows emulator that runs fine under WINE.

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Continental Europe’s First Spaceport – And It’s Above The Arctic Circle!

November 9, 2023 by 28 Comments

When we think of a space launch it’s likely our minds might turn to the lush swampland of Florida’s Cape Canaveral, or the jungle of Kourou in Guyana. These are both in the tropical regions on sites as close to the Equator as the governments who built them could find, because the higher rotational speed of the planet at its widest point gives departing rockets a bit of extra kick. Even the Soviet Baikonur cosmodrome in modern-day Kazakhstan which sits at around 45 degrees North, was chosen in part to lie in one of the more southerly Soviet republics.

It’s unexpected then to report on the opening of what may at the time of writing be the world’s newest spaceport, situated on the island of Andøya in northern Norway, at around 69 degrees North. Just what is going on?

The answer for the German company Isar Aerospace is that their launches from the site will be ideally placed not for low-inclination orbits but for polar orbits, something of a valuable commodity and a worthy point of competition when compared to equatorial sites. We have shamefacedly to admit that we’re not completely au fait with Norwegian geography, so it took us a minute to find Andøya towards the top of the country’s westward chain of islands.

The spaceport itself lies in a bay facing westward over the Norwegian Sea, and the launch platform is on a stone jetty protruding into the water. It appears to be a beautiful landscape, a suitable reward for any hardy souls who make the trip to watch a launch. Unexpectedly the spaceport stands alone in Continental Europe, though before too long it’s likely to be joined by other projects including one in northern Scotland. European skies are likely to become busier over the coming years.

Virginia Cave Is The Largest Musical Instrument In The World

November 9, 2023 by 23 Comments

Hit something with a hammer, and it makes a sound. If you’re lucky, it might even make a pleasant sound, which is the idea behind the Great Stalacpipe Organ in Luray Caverns, Virginia. The organ was created in 1954 by [Leland W. Sprinkle], who noticed that some stalactites (the ones that come down from the ceiling of the cave) would make a nice, pure tone when hit.

So, he did what any self-respecting hacker would do: he picked and carved 37 to form a scale and connected them to an electronic keyboard. The resonating stalactites are spread around a 3.5 acre (14,000 square meters) cave, but because it is in a cave, the sound can be heard anywhere from within the cave system, which covers about 64 acres (260,000 square meters). That makes it the largest musical instrument in the world.

We’ll save the pedants the trouble and point out that the name is technically an error — this is not a pipe organ, which relies on air driven into resonant chambers. Instead, it is a lithophone, a percussion instrument that uses rock as the resonator. You can see one of the solenoids that hits the rock to make the sound below.

This is also the sort of environment that gives engineers nightmares: a constant drip-drip-drip of water filled with minerals that love to get left behind when the water evaporates. Fortunately, the Stalacpipe Organ seems to be in good hands: according to an NPR news story about it, the instrument is maintained by lead engineer for the caverns [Larry Moyer] and his two apprentices, [Stephanie Beahm] and [Ben Caton], who are learning the details of maintaining a complex device like this.

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Apple System 7… On Solaris?

November 8, 2023 by 17 Comments

While the Unix operating systems Solaris and HP-UX are still in active development, they’re not particularly popular anymore and are mostly relegated to some enterprise and data center environments They did enjoy a peak of popularity in the 90s during the “wild west” era of windowed operating systems, though. This was a time when there were more than two mass-market operating systems commercially available, with many companies fighting for market share. This led to a number of efforts to get software written for one operating system to run on others, whether that was simply porting software directly or using some compatibility layer. Surprisingly enough it was possible in this era to run an entire instance of Mac System 7 within either of these two Unix operating systems, and this was an officially supported piece of Apple software.

The software was called the Macintosh Application Environment (MAE), and was an effort by Apple to bring Macintosh System 7 applications to various Unix-based operating systems, including Solaris and HP-UX. This was a time before Apple’s OS was Unix-compliant, and MAE provided a compatibility layer that translated Macintosh system calls and application programming interfaces (APIs) into the equivalent Unix calls, allowing Mac software to function within the Unix environments. [Lunduke] outlines a lot of the features of this in his post, including some of the details the “scaffolding” allowing the 68k processor to be emulated efficiently on the hardware of the time, the contents of the user manual, and even the memory management and layout.

What’s really jarring to anyone only familiar with Apple’s modern “walled garden” approach is that this is an Apple-supported compatibility layer for another system. At the time, though, they weren’t the technology giant they are today and had to play by a different set of rules to stay viable. Quite the opposite, in fact: they almost went out of business in the mid-90s, so having their software run on as many machines as possible would have been a perk at the time. While this era did have major issues with cross-platform compatibility, there was some software that attempted to solve these problems that are still in active development today.

Thanks to [Stephen] for the tip!