Virtual Mini Pinball Cabinet Scores Big

October 8, 2023 by Kristina Panos 12 Comments

Do you love pinball, but can’t justify owning a full-size cabinet? Yeah, us either, and that’s why we’re so interested in [mircemk]’s great-looking DIY mini virtual pinball cabinet. Since [mircemk] is a IT service specialist, they are lucky enough to have access to lots used and broken equipment, and that’s what this build is made of.

Essentially two computers working together, the playfield is a old 17-inch monitor that needed its LED lighting replaced before gracing the MDF cabinet The backglass is an ancient 10-inch tablet that was perfect for this application.

Even the motherboard, RAM, and SSD came from one of [mircemk]’s previous PCs. The SSD needed some attention first as well — it didn’t work sometimes, and didn’t show up in the BIOS at all, so [mircemk] threw it in the oven for 10 minutes at 250°, and now all is well.

One thing we really like about this build is that instead of designing a control board for the buttons, [mircemk] used a cheap USB joystick and wired them up to the pads.

So how does the tablet figure into all of this? It’s connected to a PC via USB and does its job thanks to a piece of software called Wired XDisplay. There is even a tilt switch in this bad boy. Because what’s a pinball cabinet without a tilt switch? A cheater’s cabinet, that’s what. Check out the build/demo video after the break.

Don’t even have the space for a mini cabinet? We hear you. Here’s one that fits in the palm of your hand.

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Hackaday Prize 2023: Hydrocleaner Nips Pollution In The Bud

October 6, 2023 by Kristina Panos 1 Comment

It’s unfortunate, but a lot of trash ends up in our rivers and, eventually, our oceans. Cleaning efforts can be costly and require a lot of human power. One of the ways to keep trash out from reaching the ocean is to attack it at the river level. That’s the idea behind [Xieshi Zhang]’s Hydrocleaner, a semi-autonomous river cleaning robot.

One current method for removing trash is by remote-controlled boats with nets attached. These typically travel in one direction, sort of sweeping left and right and probably missing trash in the process.

Hydrocleaner is capable of turning back and forth, ensuring a much more complete clean-up. The camera spots trash, and the twin-pontoon design allows it to flow easily between them and into the net behind. Currently, the brain behind this boat is a Jetson Nano, although this is a work in progress. The eventual idea is that the boat would navigate itself using GNSS guidance and would navigate toward the trash.

Of course, you could always fight trash with trash.

Two hands hold an electric motor rotor and a 3D printed coil structure next to each other. A multimeter in the background displays 297.0 mV.

ModuCoil – A Modular Coil For Motor And Generator Projects

October 2, 2023 by Navarre Bartz 2 Comments

While renewable energy offers many opportunities for decentralizing energy production, it can sometimes feel that doing so on a truly local level remains unachievable with increasingly large utility-scale deployments re-centralizing the technology. [AdamEnt] hopes to help others seize the means of energy production with the development of the ModuCoil.

This modular coil is intended to be used in motor and generator applications, and features a 3D printed structure to wind your copper about as well as a series of ferromagnetic machine screws and nuts meant to boost the field strength. This project really emphasizes the rapid part of rapid prototyping with this version 2 of the coil following only a week after the first.

[AdamEnt] only reached a peak of ~600 mV in the short test of a single coil, but is optimistic the current design could hit 1V/coil given a fully wound coil actually affixed to something instead of just held in his hand. It’s definitely early stages, but we think this could be the start of an interesting ecosystem of motor and generator designs.

If you want to learn more about how those big wind turbines work, look here, or you could check out a 3D printed brushless motor, or where all that copper comes from anyway.

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Hackaday Prize 2023: An Agricultural Robot That Looks Ready For The Field

October 2, 2023 by Jenny List 12 Comments

In the world of agriculture, not all enterprises are large arable cropland affairs upon which tractors do their work traversing strip by strip under the hot sun. Many farms raise far more intensive crops on a much smaller scale, and across varying terrain. When it comes to automation these farms offer their own special challenges, but with the benefit of a smaller machine reducing some of the engineering tasks. There’s an entry in this year’s Hackaday prize which typifies this, [KP]’s Agrofelis robot is a small four-wheeled carrier platform designed to deliver autonomous help on smaller farms. It’s shown servicing a vineyard with probably one of the most bad-ass pictures you could think of as a pesticide duster on its implement platform makes it look for all the world like a futuristic weapon.

A sturdy tubular frame houses the battery bank and brains, while motive power is provided by four bicycle derived motorized wheels with disk brakes. Interestingly this machine steers mechanically rather than the skid-steering found in so many such platforms. On top is a two degrees of freedom rotating mount which serves as the implement system — akin to a 3-point linkage on a tractor. This is the basis of the bad-ass pesticide duster turret mentioned above. Running it all is a Nvidia Jetson Nano, with input from a range of sensors including global positioning and LIDAR.

The attention to detail in this agricultural robot is clearly very high, and we could see machines like it becoming indispensable in the coming decades. Many tasks on a small farm are time-consuming and involve carrying or wheeling a small machine around performing the same task over and over. Something like this could take that load off the farmer. We’ve been there, and sure would appreciate something to do the job.

While we’re on the subject of farm robots, this one’s not the only Prize entry this year.

Passive Desalination Discovers How To Avoid Salt-Clogging

October 2, 2023 by Donald Papp 15 Comments

Saltwater is plentiful, but no good for drinking. Desalinization is the obvious solution, but a big problem isn’t taking the salt out, it’s where all that leftover salt goes. Excess salt accumulates, crystallizes, collects, and clogs a system. Dealing with this means maintenance, which means higher costs, which ultimately limits scalability.

The good news is that engineers at MIT and in China have succeeded in creating a desalination system that avoids this problem by intrinsically flushing accumulated salt as it is created, keeping the system clean. And what’s more, the whole thing is both scalable and entirely passive. The required energy all comes from gravity and the sun’s heat.

To do this, the device is constructed in such a way that it mimics the thermohaline circulation of the ocean on a small scale. This is a process in which temperature and density differentials drive a constant circulation and exchange. In the team’s system, this ultimately flushes concentrations of salt out of the system before it has a chance to collect.

The entirely passive nature of the device, its scalability, and the fact that it could desalinate water without accumulating salt for years means an extremely low cost to operate. The operating principle makes sense, but of course, it is careful engineering that shows it is actually possible. We have seen projects leveraging the passive heating and circulation of water before, but this is a whole new angle on letting the sun do the work.

Will Nickel-Hydrogen Cells Be The Energy Storage Holy Grail?

September 27, 2023 by Jenny List 38 Comments

You may have heard us here remarking in the past, that if we had a pound, dollar, or Euro for every miracle battery technology story we heard that was going to change the world, we would surely be very wealthy by now. It’s certainly been the case that many such pronouncements refer to promising chemistries that turn out only to be realizable in a lab, but here there’s news of one with a bit of pedigree. Nickel hydrogen batteries have a long history of use in space, and there’s a startup producing them now for use on the ground. Could they deliver the energy storage Holy Grail?

The cathode in a nickel-hydrogen battery is formed by nickel hydroxide, and the anode is formed of hydrogen. If a gas as an anode sounds far fetched, we’re guessing that their structure is similar to the zinc-air battery, in which zinc hydroxide forms in a paste of powdered zinc, and works against oxygen from the air over a porous conductive support. What gives them their exciting potential is their ability to take more than 30,000 charge/discharge cycles, and their relative safety when compared to lithium ion cells. Hydrogen in a pressure vessel might not seem the safest of things to have around, but the chemistry is such that as the pressure increases it reacts to form water. The cost of the whole thing is reduced further as new catalysts have replaced the platinum used by NASA on spacecraft.

We really hope that these batteries will be a success, but as always we’ll wait and see before calling it. They may well be competing by then with the next generation of zinc-air cells.

Hackaday Prize 2023: Computer Vision Guides This Farm Mower

September 24, 2023 by Jenny List 8 Comments

It’s a problem common to small-scale mixed agriculture worldwide, that of small areas of grass and weeds that need mowing. If you have a couple of sheep and enough electric fence there’s one way to do it, otherwise, if you rely on machinery, there’s a lot of hefting and pushing a mower in your future. Help is at hand, though, thanks to [Yuta Suito], whose pylon-guided mower is a lightweight device that mows an area defined by a set of orange traffic cones. Simply set the cones around the edge of the plot, place the mower within them, and it does the rest.

At its heart is a computer vision system that detects the cones and estimates distance from them by their perceived size. It mows in a spiral pattern by decreasing the cone height at which it turns, thus covering the whole area set out. Inside is a Raspberry Pi doing the heavy lifting, and because it’s designed for farmland rather than lawns, it has an adaptive track system to deal with obstacles. In its native Japan there is an ageing rural population, so it is particularly suitable for being operated by an older person. See it in action in the video below the break.

A robotic mower aimed at farms is certainly unusual here, but we’ve seen a lot of more conventional lawnmowers.

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