Getting Back That YouTube Dislike Button

Ah, Google. Very few companies have mastered the art of creating amazing technology and products, and then so effectively abandoning and mishandling them. Case in point, YouTube. Citing “dislike attacks”, which are coordinated down-voting of particular videos, YouTube opted to hide the dislike counter on all videos. It could be pointed out that dislikes still impact the recommendation algorithm the same way they always have, and that creators still see their dislike counts on their own dashboard.

There might be something to the idea that YouTube doesn’t like the notoriety of their Rewind videos leading the dislike count, with 2018 at nearly 20 million. There may even be validity in the theory that corporate partners don’t like visible dislike numbers on their videos. Regardless, YouTube made the change, and people hate it. Their platform, so nothing you can do about it, right?

“Life, uh, uh, finds a way,” to quote my favorite fictional mathematician. Yes, a hacker, one of us, has figured out a workaround. [Dmitrii Selivanov] has put together the “Return YouTube Dislike” browser extension, which does a couple of things. First, it is pulling archived data about videos, taking advantage of the gap in time between the official announcement, and the removal of the dislike API.

But for new videos? That’s where things are harder. If you install the extension, your video likes and dislikes are tracked, and the combined user data is used to extrapolate an estimated dislike count on any given video. [Dimitrii] is also working on a way to allow individual channels to share their stats with the project, to give more official numbers for their videos.

The extension is open source, and the Chrome web store shows over a million users. Linus Tech Tips, along with a bunch of other channels, have covered this, so check out their videos for more.

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Keeping The Philippines’ Surface Waters Clean With Kabooms

[Rich] over at Tropical Ocean Cleanup on YouTube has been working hard to prevent plastic waste from getting into the waters around the Philippines. Even as a mostly one-man crew, he’s collecting large sums of plastic waste using a boom system which he fittingly made out of waste: old tires and empty plastic bottles. This Kaboom system is a low-cost method of capturing any waste so that it can be collected and properly disposed of. In addition [Rich] also installs containers where locals can dispose of their plastic trash.

The Kaboom system is detailed by [Rich] in this video (also linked after the break). As a shoestring budget project, it relies heavily on donations and local support to install more of these booms. It is however a highly effective way to prevent such common plastic waste from making it into the oceans in the first place. Having these booms made out of waste items that are commonly found where humans roam should make this a snap.

Ideally, local governments would be installing such capturing systems and easy waste disposal options, but sometimes it seems grassroots efforts like these are what will bring the fastest change.

Curious about what to do with all that plastic waste once you collect and identify it? How about making some plastic bricks?

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Hackaday Links: January 2, 2022

That sound you may have heard in the wee hours of Christmas morning had nothing to do with Santa; rather, it was the sound of a million astronomers collectively letting out their breath around the world as the James Webb Space Telescope survived its fiery ride to space. And not only did it survive, but the ESA launch team did such a good job putting the Ariane rocket on course that NASA predicts the observatory now has enough fuel to more than double its planned ten-year mission. Everything about the deployment process seems to be going well, too, with all the operations — including the critical unfurling of the massive and delicate sunshield — coming off without a hitch. Next up: tensioning of the multiple layers of the sunshield. If you want to play along at home, NASA has a nice site set up to track where JWST is and what its current status is, including temperatures at various points on the telescope.

We got a tip from Mark about some dodgy jumper wires that we thought we should share. Low-quality jumpers aren’t really a new problem, but they can really put a damper on the fun of prototyping. The ones that Mark found could be downright dangerous. He got them with a recent dev board purchase; outwardly, they appear fine, at least at first. Upon closer inspection, though, the conductors have turned to powder inside the insulation. Even the insulation is awful, since it discolors when even slightly flexed. He suspects conductors are actually copper-plated aluminum; check out his pictures below and maybe look through your collection for similarly afflicted jumpers.

Speaking of dodgy hardware, if you love the smell of melting MOSFETs in the morning, then have we got a deal for you. It seems that a non-zero number of Asus Z690 Hero PC motherboards have suffered a fiery demise lately, stirring complaints and discontent. This led some curious types to look for the root cause, which led to the theory that an electrolytic cap had been installed with the wrong polarity on the dead boards. Asus confirmed the diagnosis, and is doing the right thing as they are “working with the relevant government agencies on a replacement program.” So if you’ve got one of these motherboards, you might want to watch the video below and see how the caps were installed.

If you’re in the mood for some engineering eye-candy, check out the latest video from Asianometry. They’ve got a finger on the pulse of the semiconductor industry, with particular attention paid to the engineering involved in making the chips we all have come to depend on. The video below goes into detail on the extreme ultraviolet (EUV) light source that fabrication machine maker ASML is developing for the next generation of chip making. The goal is to produce light with a mind-bending wavelength of only 13.5 nanometers. We won’t spoil the details, but suffice it to say that hitting microscopic droplets of tin with not one but two lasers is a bit of a challenge.

And finally, bad luck for 38 people in Tokyo who were part of a data breach by the city’s Metropolitan Police Department. Or rather, good luck since the data breach was caused by the loss of two floppy disks containing their information. The police say that there haven’t been any reports of misuse of the data yet, which is really not surprising since PCs with floppy drives are a little thin on the ground these days. You’d think that this would mean the floppies were left over from the 90s or early 2000s, but no — the police say they received the disks in December of 2019 and February of 2021. We’d love to know why they’re still using floppies for something like this, although it probably boils down to yet another case of “if it ain’t broke, don’t fix it.”

Swiss Army Knife Of Power Tool Carts

When you’re into woodworking in a serious way, you’re going to eventually want some power tools. With such efficiency of operation, things can go pear-shaped quickly, with wood dust getting absolutely everywhere. It’s not always practical (or desirable) to work outdoors, and many of us only have small workshops to do our making in. But woodworking tools eat space quickly. Centralized extraction is one solution, but all that fixed rigid ducting forces one to fix the tool locations, which isn’t always a good thing. Moveable tool carts are nothing new, we’ve seen many solutions over the years, but this build by [Peter Waldraff] is rather slick (video embedded below,) includes some really nice features in a very compact — and critically — moveable format.

By repurposing older cabinets, [Peter] demonstrates some real upcycling, with little going to waste and the end result looks great too! There is a centralized M-Class (we guess) dust extractor with a removable vacuum pipe which is easily removed to hook up to the smaller hand-held tools. These are hidden in a section near the flip-up planer, ready for action. An auto-start switch for the small dust extractor is wired-in to the smaller tools to add a little ease of use while reducing the likelihood of forgetting to switch it on. We’ve all done that.

For the semi-fixed larger tools, such as the miter and table saws, a separate, higher flow rate moveable dust extractor can be wheeled over and hooked up to the integrated plenum chamber, which grabs the higher volume of dust and chips produced.

A nice touch was to mount the miter saw section on sliding rails.  This allows the whole assembly to slide sideways a little, giving more available width at the table saw for ripping wider sheets. With another little tweak of some latches, the whole miter section can flip over, providing even more access to the table saw, or just a small workbench! Cracking stuff!

Need some help getting good with wood, [Eric Strebel] has some great tips for you! And if you’re needs are simpler and smaller, much much smaller, here’s a finger-sized plane for you.

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Teensy 4 Pushed To The Limit With 1 GHz Overclock

Do you need a microcontroller that runs at 1 GHz? No, probably not. But that didn’t stop [Visual Micro] from trying, and the results are pretty interesting. Not only did the plucky little chip not cook itself, it actually seemed to run fairly well; with the already powerful microcontroller getting a considerable boost in performance.

According to [Visual Micro] the Teensy 4.1, which normally has its ARM Cortex-M7 clocked at 600 MHz, can run at up to 800 MHz without any additional cooling. But beyond that, you’ll want to invite some extra surface area to the party. It’s easy enough to cut a chunk out of an old CPU/GPU cooler and stick it on with a dab of thermal compound, but of course there’s no shortage of commercially available heatsinks at this size that you could pick up cheap.

Cutting a custom heatsink.

With the heatsink installed, [Visual Micro] shows the Teensy running at around 62 °C during a benchmark. If that’s a little hot for your liking, they also experimented with an old laptop cooler which knocked the chip down to an impressive 38 °C while under load. It doesn’t look like a particularly practical setup to us, but at least the option is there.

[Visual Micro] unfortunately doesn’t go into a lot of detail about the benchmark results, but from what’s shown, it appears the overclock netted considerable gains. A chart shows that in the time it took a stock Teensy to calculate 15.2 million prime numbers, the overclocked chip managed to blow through 21.1 million. The timescale for this test is not immediately clear, but the improvement is obvious.

Even at the stock 600 MHz, the Teensy 4 is a very powerful MCU. Especially after the 4.1 refresh brought in support for additional peripherals and more RAM. But we suppose some people are never satisfied. Got a project in mind that could benefit from an overclocked Teensy? We’d love to hear about it.

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An image showing a water cooler PCB on the desk, with probes and jumper wires connected to it.

Taking Water Cooler UX Into Your Own Hands With Ghidra

Readers not aware of what Ghidra is might imagine some kind of aftermarket water cooler firmware or mainboard – a usual hacker practice with reflow ovens. What [Robbe Derks] did is no less impressive and inspiring:  A water cooler firmware mod that adds hands-free water dispensing, without requiring any hardware mods or writing an alternative firmware from scratch.

Having disassembled the cooler, [Robbe] found a PIC18F6527 on the mainboard, and surprisingly, it didn’t have firmware readback protection. Even lack of a PICkit didn’t stop him – he just used an Arduino to dump the firmware, with the dumper code shared for us to reuse, and the resulting dumps available in the same repository.

From there, he involved Ghidra to disassemble the code, while documenting the process in a way we can all learn from, and showing off the nifty tricks Ghidra has up its sleeves. Careful planning had to be done to decide which functions to hook and when, where to locate all the extra logic so that there’s no undesirable interference between it and the main firmware, and an extra step taken to decompile the freshly-patched binary to verify that it looks workable before actually flashing the cooler with it.

The end result is a water cooler that works exactly as it ought to have worked, perhaps, if the people defining its user interaction principles were allowed to make it complex enough. We could argue whether this should have been a stock function at all, but either way, it is nice to know that we the hackers still have some of the power to make our appliances friendly — even when they don’t come with an OS. Certainly, every single one of us can think of an appliance long overdue for a usability boost like this. What are your examples?

We’ve covered quite a few Ghidra-involving hacks, but it never feels like we’ve had enough. What about patching an air quality meter to use Fahrenheit? Or another highly educational write-up on cracking GBA games? Perhaps, liberating a Linux-powered 4G router to reconfigure it beyond vendor-defined boundaries? If you have your own goal in mind and are looking to start your firmware reverse-engineering journey, we can say with certainty that you can’t go wrong with our HackadayU course on Ghidra.

An OpenSCAD Library For All Your CNC Cutting Needs

While there’s always the edge case, there’s a strong likelihood that if you’re using OpenSCAD, you’re probably working on a CAD model that you intend to 3D print at some point. Of course that’s not to say this is all you can do in OpenSCAD, but it’s arguably what it does best. If you wanted to make artistic models, or maybe render what your new kitchen will look like, there are other tools better suited to such tasks.

But thanks to lasercut.scad, a library that [Brendan Sleight] has been working on for the last several years, we might have to reconsider our preconceived dimensional notions. Instead of designing parts for 3D printing, his library is all about creating parts intended for subtractive manufacturing. Originally (as the name implies) it was geared towards laser cutting, but the project has since evolved to support CNC routers, vinyl cutters, and pretty much anything else that can follow a DXF file.

This “clip” joint is great for acrylic.

The library has functions for creating the standard tricks used to build things from laser-cut pieces, like finger joints, captive nuts, and assembly tabs. If it was something you once saw holding together an old wooden 3D printer kit back in the day, you can probably recreate it with lasercut.scad. It even supports a pretty wild piece of rotational joinery, courtesy of [Martin Raynsford].

Don’t have a way of concentrating a sufficient number of angry photons at your workpiece? No worries. The library has since been adapted to take into account a parametric kerf width, which lets you dial in how much of a bite your particular tool will take from the material when it does the business. There are even special functions for dealing with very thin cuts, which [Brendan] demonstrates by assembling a box from sheet vinyl.

Of course, those who’ve used OpenSCAD will know there’s not an “Export for CNC” button anywhere in the stock interface. So to actually take your design and produce a file your cutter can understand, [Brendan] has included a Bash script that will run the necessary OpenSCAD incantations to produce a 2D DXF file.

[Brendan] decided to send this one in after he saw the aluminum enclosure OpenSCAD library we covered recently. If you’ve got your own pet project that bends some piece of hardware or software to your will, don’t be shy to let us know.