Flapping PCB Fan Blows A Little Bit

August 23, 2022 by 24 Comments

Moving air with spinning blades is the most popular way, but it is not the only way. Using the PCB actuator technology he has been working on for the past few years, [Carl Bugeja] built a small electromagnetic flapping fan using a custom flexible PCB.

Inspired by expensive piezoelectric fans ($400 for a 30mW fan), [Carl] wanted to see if a cheaper alternative could be made. Using a similar design to his other PCB actuators, he had a custom flexible PCB made with an integrated coil, which can flex on two thin supports. These supports also contain the power traces for the coil. By sticking the base of the PCB between two neodymium magnets, it can flap back and forth when driven by an alternating current. It produces a bit of airflow, but nearly enough to be useful. The power traces in the thin supports also break after an extended period of 180° flapping.

Although this probably won’t be a viable replacement for a rotary fan, it would be interesting to see how far one can push this approach by optimizing the design and magnet arrangement.

Continue reading “Flapping PCB Fan Blows A Little Bit” →

High-Speed RC Car Needs A Flight Controller

August 23, 2022 by 2 Comments

The fastest ground vehicles on earth are not driven by their wheels but by an aircraft jet engine. At world record speeds, they run on an aerodynamic razor’s edge between downforce, which limits speed, and liftoff, which can result in death and destruction. [rctestflight] wanted to see what it takes to run an RC car at very high speeds, so he built a ducted-fan powered car with aerodynamic control surfaces and an aircraft flight controller.

This high-speed car is built on the chassis of a 1/14th scale RC buggy, powered by 4 EDF (electric ducted fans) mounted on a very long aerodynamic foam board shell. It also has an aircraft-style tail with elevons and rudders for stabilization and control at high speed using an ArduPilot flight controller. The flight controller is set up to stabilize in the roll and yaw axis, with only fixed trim in the pitch axis.

[rctestflight] got the car up to 71 MPH (114 km/h), which is fast for most RC cars but well short of the 202 MPH RC car speed record. It was still quite hard to keep in a straight line, and the bumpy roads certainly didn’t help. He hopes to revisit the challenge in the future with larger motors and high voltage batteries.

Continue reading “High-Speed RC Car Needs A Flight Controller” →

2022 Hackaday Prize: Plant Monitoring System Grows To Include LoRa

August 23, 2022 by 7 Comments

Change on industrial scales is slow, but if you’re operating your own small farm or simply working in a home garden there are some excellent ways to use water more effectively. The latest tool from [YJ] makes it possible to use much less water while still keeping plant yields high.

This is an improvement on a previous project which automates watering and lighting of a small area or single pot. This latest creation, called FLORA, includes a LoRa module for communication up to 3 kilometers, and the ESP32 on board also handles monitoring of soil moisture, humidity and other sensors. It also includes a pump driver for managing irrigation systems so that smart decisions can be made about when to water. Using this device, the water usage when testing was reduced by around 30% compared to a typical timed irrigation system.

Using a smart system like this is effective for basically any supply of water, but for those who get water from something like an off-grid rainwater system or an expensive water utility, the gains are immediate. If you aren’t already growing your own food to take advantage of tools like this, take a look at this primer to get you started.

The HackadayPrize2022 is Sponsored by:

IBM’s Early PC Attracts Time Travelers

August 23, 2022 by 53 Comments

It wasn’t long ago I was nostalgic about an old computer I saw back in the 1980s from HP. It was sort of an early attempt at a PC, although price-wise it was only in reach for professionals. HP wasn’t the only one to try such a thing, and one of the more famous attempts was the company that arguably did get the PC world rolling: IBM. Sure, there were other companies that made PCs before the IBM PC, but that was the computer that cemented the idea of a computer on an office desk or at your home more than any computer before it. Even now, our giant supercomputer desktop machines boot as though they were a vintage 1981 PC for a few minutes on each startup. But the PC wasn’t the first personal machine from IBM and, in fact, the IBM 5100 was not only personal, but it was also portable. Well, portable by 1970s standards that also had very heavy video cameras and luggable computers like the Osborne 1.

The IBM 5100 had a brief three-year life from 1975 to 1978. A blistering 1.9 MHz 16-bit CPU drove a 5-inch CRT monitor and you could have between 16K and 64K of RAM along with a fair amount of ROM. In fact, the ROMs were the key feature and a giant switch on the front let you pick between an APL ROM and a BASIC ROM (assuming you had bought both).

Continue reading “IBM’s Early PC Attracts Time Travelers” →

2022 Hackaday Supercon: Call For Proposals Extended

August 23, 2022 by 5 Comments

Good news, procrastinators and those of you who simply have not yet worked up the nerve to submit! The 2022 Hackaday Supercon Call for Proposals has been extended one more week. You’ve been waiting until the last minute? Well, it’s now one minute past the last minute, but we’ve got your back. You have until Thurs, Sep. 1 to get your talk or workshop proposal in. (We’re not extending it twice!)

Everyone has a good story to share. Whether it’s a tale of software or hardware, or that tricky “firmware” that falls somewhere in the middle, we have a crowd who would love to hear it. You almost never leave a project as the same person who entered it, and you should tell us your story. We have two talk tracks, one for shorter talks and demos of around 20 minutes, and one for epic sagas of 45 minutes or so. Whether you’re a first-time presenter or a seasoned pro, we’d like to hear about your hacks.

To sweeten the pot, all presenters get in free. So what are you waiting for? Send in your ideas now – you’ve got a couple months to get the slides into shape.

The First-Ever Kansas City Keyboard Meetup Is This Weekend

August 23, 2022 by 18 Comments

Sometimes, if you wait long enough for something you want, it will come to you. Whether it’s the law of attraction or just plain laziness, it has finally happened — there’s a keyboard meetup happening within a 500-mile radius of me. As far as I know, it’s the first one ever in Kansas City. I’m going, I’m bringing weird keyboards, and I might even have some Hackaday stickers to sprinkle around.

Although the event was originally planned to take place in the side room of a coffeehouse in the historic northeast, it was quickly moved to a much larger, co-working space downtown to accommodate all the maniacs like yours truly who want to bring a whole bunch of keebs. I’m even bringing some tables, y’all.

This’ll be more than just a show and tell, because what kind of object-focused nerd gathering would be complete without a swap meet element? You’re probably going to find that all kinds of keyboards and keyboard accessories are for sale, but you also might get lucky and win a cute bag of switches from Kinetic Labs, or a 3×4 macro pad from Boardsource (who will also have stickers on hand).

Come for the cool keyboards, and stay for the conversations you’ll strike up with the awesome folks who brought them. Who knows, maybe we’ll all infiltrate the slammin’ ice cream shop down the street.

Questions? Comments? Just want to share your excitement? Come join the Discord! If you’re planning to show up on Saturday, please take a second to fill out the head count document. If you do, it’ll probably net you a deli sandwich when you get there.

If you can’t make it, that’s okay — stay tuned for coverage of the event, and start planning for the next one, because hopefully, there will be many more to come.

Main and thumbnail images by Mingwei Lim on Unsplash

Optimizing The Mining Of Uranium From Coal Ash And Seawater

August 23, 2022 by 55 Comments

Of all the elements that make up the Earth’s crust, uranium is reasonably abundant, coming in at 49th place, ahead of elements such as tin, tungsten and silver. Ever since humankind began to exploit uranium for its fissile properties in energy production, this abundance has also translated into widespread availability for mining. As of 2019, Kazakhstan, Canada and Australia formed the world’s main producers, accounting for about 68% of output.

Considering the enormous energy density of uranium when used as fuel in a nuclear fission reactor, the demand for uranium is relatively low, especially combined with the long (two years on average) refueling cycles of commercial reactors. The effect is that even with the very inefficient once-through fuel cycle – which only uses a fraction of the uranium fuel’s potential energy – uranium market prices have remained relatively low and stable even amidst geopolitical crises.

Despite this, the gradual rise in uranium market prices ($10/lb in 2003, $49/lb in 2022), as well as the rapid construction of new reactors is driving new exploration. Here recent innovations may make uranium fuel even more accessible to all nations, by unlocking the billions of tons of uranium found in plain seawater as well as the many tons of fly ash produced by coal plants every single day.

Continue reading “Optimizing The Mining Of Uranium From Coal Ash And Seawater” →