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Hackaday Links: February 28, 2021

In an announcement that came as a surprise to few, NASA now says that landing humans on the Moon by 2024 is no longer likely. Acting administrator Steve Jurczyk lays the blame at the feet of Congress, for failing to provide the funds needed for Human Landing Systems development, a critical step needed to meet the aggressive overall timeline. The announcement doesn’t mark the end of the Artemis program; in fact, NASA is continuing to work on a realistic timeline for getting boots back on the lunar surface, and a decision on which of the three submitted proposals for a lunar lander will be further developed should be coming in the next few months. As far as we can see, this is simply an adjustment to the original timeline for a landing, but given the stunning recent success of Perseverance showing just what robots can do, we’d expect pushback from some quarters on the need for human exploration.

The entry-level 3D design market was thrown into considerable turmoil last year when Autodesk changed the licensing terms for its flagship Fusion 360 package. Hobbyists who had been enjoying relatively unfettered access to the powerful suite chafed at the new restrictions, leaving many to threaten to jump ship, apparently without much thought given to the dearth of alternative products. That may be changing now that Dassault Systèmes has announced two new versions of SolidWorks aimed at the maker and student segments. The Makers offer is intended for hobbyists who want to design for benchtop manufacturing methods like 3D-printing. The Students offer is aimed at engineering and design students looking to gain experience with the tools they’ll be expected to have mastered by the time they enter the job market. It looks like the Makers offer will be at least partly contingent on the interest expressed by the community, so you might want to make your feeling know on the subject. If the Makers edition comes to pass in the second half of this year, it will likely target a $99/year price point.

We stumbled upon an interesting YouTube series the other day that stirred the creative juices. We all probably remember the first time we learned about the Mandelbrot set, the fractal number set that looks something like a lumpy kidney bean and continues to do so no matter how far you zoom into it. The image may be complex but the math behind it is simple enough to implement in software that it’s often done as an exercise for CS students and other unfortunates. But implementing a Mandelbrot set generator in logic is possible too, which WildEngineering did in this video series. Rather than implement this as discrete logic gates, he used a neat logic simulator called Digital, which looks like a handy tool to learn all by itself. The Mandelbrot generator concepts are really instructive too, and it sure seems like the next logical step would be to gather the needed 74xx-series chips and start breadboarding. We’d love to give it a whirl ourselves, but won’t be heartbroken if someone beats us to it.

If it sometimes appears that we at Hackaday get a little frustrated with the comments section of the articles we write, rest assured that we know that we have the best readers on the planet, hands down. Where the toxicity of other corners of the Internet is often unbearable, our readers truly do make this a fabulously collaborative environment, on the whole.

In fact, some commenters even go so far as to basically write their own articles in response to one of ours, and when that happens we like to point it out. The article that spawned the effort was Kristina Panos’ excellent “What If I Never Make Version Two?”, a recent piece that dips a toe into the psychology of hacking. Peter Walsh picks up on the theme with his Hackaday.io page entitled “The Psychology of Version Two”, which we really enjoyed. After a brief look at the neurochemistry of happiness, Peter dives into some “brain hacks” to assess the need for a version 2. There are some great tips, and we really enjoyed both the original article and Peter’s response.

BGA Soldering And Inspection

If you want to build cool things these days, you’ve probably had to master surface mount electronics. However, for many people, ball grid array (BGA) is still intimidating. Have a look at [VoltLog’s] video about his techniques for soldering BGA and inspecting that you managed to do it right.

He’s got quite a few tips about things like surface finish and flux selection. It looks easy when he does it. Of course, having a good PCB with good registration markings will help too.

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Hidden TV-Out On The Nintendo DS Lite

The DS Lite was one of Nintendo’s most popular handheld gaming consoles, but unbeknownst to all, it has a hidden feature that could have made it even more popular. Digging through the hardware and firmware, the [Lost Nintendo History] team discovered the System-on-Chip (SoC) in the DS Lite can output a composite video signal.

The SoC can output a 10-bit digital output running at 16.7 MHz, but it is disabled by the stock firmware early in the boot process, so custom firmware was required. It still needs to be converted to an analog signal, so a small adaptor board with a DAC (digital-analog converter) and op-amp is attached to the flex cable of the upper screen. A set of buttons on the board allow you to select which screen is displayed on the TV. The adaptor board is open source, and the Gerbers and schematics are available on GitHub.

The current version of the adaptor board disables the upper screen, but the [Lost Nintendo History] team is considering designing a pass-through board to eliminate this disadvantage. The TV-out mod can also be combined with the popular Macro mod, in which the upper screen is removed to turn it into a Game Boy Advance. The Nintendo DS is a popular hacking subject, and we’ve been covering them for well over a decade.

Fail Of The Week: How Not To Build A Filament Extruder

It would be great if you could create your own filament. On the face of it, it seems easy to do, but as [Thomas Sanladerer] found out when he was a student, there are a lot of details that can bedevil your design. His extruder sort of works, but he wouldn’t suggest duplicating his effort. In fact, he hopes you can learn what not to do if you try to do it yourself.

In all fairness, [Thomas] was a low-budget student and was trying to economize. For example, he tried using a drill to drive the auger. Why not? It looks like a drill bit. But he found out that wasn’t satisfactory and moved to a pair of wiper motors with their built-in gear train.

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Nissan’s Office Pod Concept Is A Productivity Paradise On Wheels

All this working from home is pretty great, but we have to admit that we miss packing up the Hackaday office and heading for the local coffeehouse once in a while to spend a few hours writing against the buzzing background. One thing we don’t miss about the experience is that you’re never guaranteed a place to sit and spread out. And unless you trust a friendly stranger to keep an eye on your stuff while you’re in the bathroom, you have to take it with you at the risk of losing your table.

If only we could afford one of Nissan’s mobile office pod concept vehicles. We’ve always wanted to pretend we’re doing surveillance and would probably have the thing wrapped with graphics for a fake flower shop or something. That would certainly make it easier to park somewhere and borrow someone’s open Wi-Fi network  — maybe even from the coffeehouse parking lot after we hit the drive-thru.

As you’ll see in the extended tour video below, Nissan seem to have thought of everything except restroom facilities. The cab-over-engine design and all-terrain tires would make it easier to drive out into nature and really get away from it all. Once you’ve found the perfect spot, you can open the lift gate for some fresh air, or get some sun while you work by pulling out the motorized unibody-constructed cubicle which includes a built-in Herman Miller Cosm chair. (Evidently the Aeron is old and busted now; we disagree). For some reason, the cubicle is edge-lit, and not in a way that would help you work at the desk. According to the video, it’s based on the Caravan NV350, which looks far more comfortable but not as cool when outfitted as an alternate mobility concept.

The office pod has some nice amenities like a DC-AC converter so you can run your Keurig or Nespresso, and there’s even a UV-disinfecting lamp in the glove box. The larger windows behind the cab can be electronically shaded so you don’t bake in the sun. Here’s where things get a bit ridiculous: the floor is made of clear polycarbonate in case you want to park lengthwise over a small stream and watch the surviving fish go by underneath your feet. And if you really want to take a break, climb up to the roof deck and stretch out in the chaise lounge beneath the deck umbrella.

If we lived anywhere but America, we might forego the flower shop graphics wrap and dress it up to look like a TV detector van instead.

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OnShape To Robot Models Made Easier

We live in a time where our phones have computing power that would have been the envy of NASA a few decades ago. So, in theory, we should be able to simulate just about anything. Thanks to [rhoban], robots you design in OnShape — a popular CAD tool — are now easier to simulate using several common simulation tools.

Electronic circuits are pretty easy to simulate, because we typically draw schematics and circuit simulators can capture those schematics readily. But simulating physics for robotic designs is a bit trickier. Gazebo and Pybullet both can use SDF files or URDF. However, building those files is often a separate process from actual physical design even though you probably did the design using a CAD tool. Even if you don’t use OnShape, you can probably import your preferred format and then bridge to the simulation file format without having to manually recreate your design. You can see the author walk through the process in the video below.

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How To Monitor Blood Pressure Without Raising It

Does anyone actually enjoy the sensation of being squeezed by a blood pressure cuff? Well, as Mom used to say, it takes all kinds. For those who find the feeling nearly faint-inducing, take heart: researchers at UC San Diego have created a non-invasive medical wearable with a suite of sensors that can measure blood pressure and monitor multiple biochemicals at the same time.

The device is a small, flexible patch that adheres to the skin. So how does it manage to measure blood pressure without causing discomfort? The blood pressure sensor consists of eight customized piezoelectric transducers that bounce ultrasonic waves off the near and far walls of the artery. Then the sensor calculates the time of flight of the resulting echoes to gauge arterial dilation and contraction, which amounts to a blood pressure reading.

This patch also has a chemical sensor that uses a drug called pilocarpine to induce the skin to sweat, and then measures the levels of lactate, caffeine, and alcohol found within. To monitor glucose levels, a mild current stimulates the release of interstitial fluid — the stuff surrounding our cells that’s rife with glucose, salt, fatty acids, and a few minerals. This is how continuous glucose monitoring for diabetes patients works today. You can check out the team’s research paper for more details on the patch and its sensors.

In the future, the engineers are hoping to add even more sensors and develop a wireless version that doesn’t require external power. Either way, it looks much more comfortable and convenient than current methods.