For many of us, our passion for electronics and science originated with curiosity about some device, a computer, radio, or even a car. The subject of this book has just such an origin. However, how many of us made this discovery and pursued this path during times of hunger or outright famine?
That’s the remarkable story of William Kamkwamba that’s told in the book, The Boy Who Harnessed the Wind. Remarkable because it culminates with his building a windmill (more correctly called a wind turbine) that powered lights in his family’s house all by the young age of fifteen. As you’ll see, it’s also the story of an unyielding thirst for knowledge in the face of famine and doubt by others.
I’ve got a friend who tells me at every opportunity that soy is the downfall of humanity. Whatever ails us as a society, it’s the soy beans that did it. They increase violent tendencies, they make us fat and lazy, they run farmers out of business, and so on. He laments at how hard it is to find food that doesn’t include soy in some capacity, and for a while was resigned to eating nothing but chicken hot dogs and bags of frozen peas; anything else had unacceptable levels of the “Devil’s Bean”. Overall he’s a really great guy, kind of person who could fix anything with a roll of duct tape and a trip to the scrap pile, but you might think twice if he invites you over for dinner.
A column of soy soldiers stand at the ready.
So when he recently told me about all the trouble people are having with soy-based electrical wiring, I thought it was just the latest conspiracy theory to join his usual stories. I told him it didn’t make any sense, there’s no way somebody managed to develop a reliable soy-derived conductor. “No, no,” he says, “not the conductor. They are making the insulation out of soy, and animals are chewing through it.”
Now that’s a bit different. I was already well aware of the growing popularity of bioplastics: the PLA used in desktop 3D printers is one such example, generally derived from corn. It certainly wasn’t unreasonable to think somebody had tried to make “green” electrical wiring by using a bioplastic insulation. While I wasn’t about to sit down to a hot bag of peas for dinner, I had to admit that maybe in this case his claims deserved a look.
When you move from one-off builds to production scale, perhaps to meet that Kickstarter commitment or to keep your Tindie store stocked, you’re going to need to tool up. Jobs like building wiring harnesses can be tedious and time-consuming, so outsourcing them to this robot wire cutter might be a good idea.
The video below tells the whole tale of this build, which despite the fact that [Maclsk] seems to have put it together quickly from scrap bin parts still looks pretty professional. The business end of the machine is a 3D printer extruder, minus the hot end, of course. A Nano controls the extruder’s stepper to shoot out the right length of wire, as well as the servo that squeezes the snippers. An LCD display and some pushbuttons provide the UI that rounds out the build. Tell it how long and how many, and you’ll be ready to build. We can see how this might be upgraded to strip the wires as well, although getting both ends stripped might be tricky.
Might this component tape-cutting robot from a few weeks back have inspired [Maclsk]’s build? Perhaps, but in any case, both are fun to watch.
What would you do if you were driving along the highway and you glanced into a field to see a giant array of fluorescent tubes lit wirelessly from the electromagnetic fields of power lines. Back in 2004, [Richard Box] set up this display after hearing about a friend playing “light saber” with fluorescent tubes under power lines. The tubes can be lit pretty easily by have a variation in voltage between the ends. By sticking one end in the ground and the other up in the air, he’s harnessing the strong magnetic field from the power lines. Though some thought the display was made to bring people’s attention to possible hazards of living near the lines, [Box] states that he did it just because it looked cool.
Sim racing is a lot more complex than playing Need For Speed 3: Hot Pursuit. You need buttons for all kinds of stuff, from headlights to brake balance to traction control. If you want to control all that in an intuitive and realistic manner, you’ll want to build yourself a decent button pad like [Chris Haye] has done. It’s surprisingly easy, too!
Very cool.
[Chris] is quite a serious racer, and needed four button boxes. He wanted to do this on the cheap, so he decided to build his first three boxes around the Zero Delay Arcade USB Encoder, a cheap controller board available on eBay for around £7. Arcade buttons were sourced off Amazon to populate the black project boxes which acted as the housings.
His final button pad looks straight out of a GT3 race car, but it’s the simplest of the bunch. It’s literally just a USB numpad with a carbon vinyl wrap applied and some home-printed labels. One suspects the feel isn’t particularly high-quality but the look is top tier. If you’re a streamer that wants to build a hardcore-looking setup, this is a great way to go.
[Chris] estimates that each box took maybe an hour to build, tops. It’s a great example of solution-focused design. He could have gotten out his own microcontroller and done a custom PCB and all that, and the results surely would have been good. But it would have taken far longer! It’s hard to beat the speed of wiring together Amazon arcade buttons with the Arcade USB Encoder’s pre-terminated wire harness. If you’re more interested in sim racing than building button boxes, it’s a great way to do a custom pad fast.
Best of all? [Chris] says he managed to put these all together for £60—quite a feat of bargain engineering. We’ve featured some other builds along these lines before, too—even using vintage aircraft controls! Video after the break.
Join Hackaday Editor-in-Chief Elliot Williams and Staff Writer Dan Maloney for their take on the hottest hacks in a hot, hot week. We found a bunch of unusual mechanisms this week, like an omnidirectional robot that’s not quite wheeled but not quite a walker either. Or, if you’d rather fly, there’s a UAV that’s basically a flying propeller. There’s danger afoot too, with news of a chess-playing robot with a nasty streak, a laser engraver that’ll probably blind you, and a high-voltage corona motor that actually does useful work. We’ll use our X-ray vision to take a deep dive into a 60-GHz phased array antenna, let a baby teach a machine what it means to be hungry, and build a couple of toy cameras just for funsies. Balloons as a UI? Maybe someday, thanks to ultrasonic levitation. And we’ll wrap things up by snooping in on the Webb telescope’s communications, as we find out how many people it takes to make wire harnesses. Spoiler alert: it’s a lot.
Check out the links below if you want to follow along, and as always, tell us what you think about this episode in the comments!
For all of us fascinated with 3D printing, it’s easy to forget that 3D printer jams are an extra dimension of frustration to handle. Not to mention that our systems don’t really lend themselves well to being easily disassembled for experiments. For anyone longing for a simpler tune-up experience, you’re in luck. [MihaiDesigns] is dawning on what looks to be a cleanly designed solution to nozzle-changing, servicing, and experimenting.
The video is only 39 seconds, but this design is packed with clever editions that come together with a satisfying click. First, the active part of the extruder is detachable, popping in-and-out with a simple lever mechanism that applies preload. For consistent attachment, it’s located with a kinematic coupling on the side with a magnet that helps align it. What’s neat about this design is that it cuts down on the hassle of wire harnesses; tools are set to share the same harness via an array of spring-loaded pogo pins. Finally, a quick-change extruder might be neat on its own, but [MihaiDesigns] is teasing us with an automatic tool change feature with a handy lever arm.
This is a story told over multiple sub-60-second videos, so be sure to check out their other recent videos for more context. And for the 3D printing enthusiasts who dig a bit further into [MihaiDesigns’] video log, you’ll be pleased to find more magnetic extruder inventions that you can build yourself.
The world of tool-changing 3D printers is simply brimming with excitement these days. If you’re curious to see other machines with kinematic couplings, have a peek at E3D’s toolchanger designs, Jubilee, and [Amy’s] Doot Changer.
