Supercon 2022: Irak Mayer Builds Self-Sustainable Outdoor IoT Devices

March 13, 2023 by Dave Rowntree 4 Comments

[Irak Mayer] has been exploring IoT applications for use with remote monitoring of irrigation control systems. As you would expect, the biggest challenges for moving data from the middle of a field to the home or office are with connectivity and power. Obviously, the further away from urbanization you get, the sparser both these aspects become, and the greater the challenge.

[Irak] solves his connectivity problem by assuming there is some WiFi network within range, building a system around the Blues Wireless WiFi note card. Substituting their cellular card would be an option for applications out of WiFi range, but presumably without changing too much on the system and software side of things. Leveraging the Adafruit FeatherWing INA219, which is a bidirectional current sensor with an I²C interface, for both the power generation and system consumption measurements. For control, [Irak] is using an Adafruit ESP32 board, but says little more about the hardware. On the software side, [Irak] is using the Blues Wireless NoteHub for the initial connection, which then routes the collected data onto the Adafruit IoT platform for collation purposes. The final part of the hardware is a LiPo battery which is on standby to soak up any excess power available from the energy harvesting. This is monitored by an LC709203f battery fuel gauge.

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Scratch Built Wind Turbine Makes Power And Turns Heads

November 11, 2022 by Ryan Flowers 31 Comments

If you’ve ever aspired to live off the grid, then it’s likely that one of the first things you considered was how to power all of your electrical necessities, and also where to uh… well we’ll stick to the electrical necessities. Depending on your location, you might focus on hydroelectric power, solar power, or even a wind turbine. Or, if you’re [Kris Harbor], all three. In the video below the break, we get to watch [Kris] as he masterfully rebuilds his wind turbine from scratch and reconfigures his charging solution to match.

The Rotors Are Built With a 3d Printed Rotor Jig

A true hacker at heart, [Kris] has used a everything from 3d printing to broken car parts in order to build his new wind turbine. The three phase generator is constructed from scratch. A hand wound stator is held firmly between two magnetic rotors, where 3d printed jigs hold the magnets in place.

A CNC cut backing plate holds everything together while also supporting the automatically furling vane that keeps the entire turbine from self destructing in inclement weather. A damaged wheel hub from [Kris]’ Land Rover provides the basis for a bearing so that the entire turbine can turn to face the wind, and various machined parts round out the build. The only things we didn’t see in the build were hot glue and zip ties, but we remain hopeful. Continue reading “Scratch Built Wind Turbine Makes Power And Turns Heads” →

Can We Repurpose Old Wind Turbine Blades?

October 8, 2021 by Lewin Day 90 Comments

Wind turbines are a fantastic, cheap, renewable source of energy. However, nothing lasts forever, and over time, the blades of wind turbines fatigue and must be replaced. This then raises the question of what to do with these giant waste blades. Thankfully, a variety of projects are exploring just those possibilities.

A Difficult Recycling Problem

Around 85% of a modern wind turbine is recyclable. The problem is that wind turbine blades currently aren’t. The blades last around 20 to 25 years, and are typically made of fiberglass or carbon fiber. Consisting of high-strength fibers set in a resin matrix, these composite materials are incredibly difficult to recycle, as we’ve discussed previously. Unlike metals or plastics, they can’t just be melted down to be recast as fresh material. Couple this with the fact that wind turbine blades are huge, often spanning up to 300 feet long, and the problem gets harder. They’re difficult and expensive to transport and tough to chop up as well.

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$10 000 Physics Wager Settles The Debate On Sailing Downwind Faster Than The Wind

July 2, 2021 by Danie Conradie 95 Comments

By now, many of you have seen the video of [Rick Cavallaro]’s Blackbird, the controversial wind-powered land vehicle that can outrun the wind. The video has led to a high-profile $10 000 wager between [Derek Muller] aka [Veritasium] and [Alex Kusenko], a professor of physics from UCLA. [Veritasium] won the wager with the help of a scale model built by [Xyla Foxlin], and you need to watch the videos after the break for some excellent lessons in physics, engineering, and civilized debate.

After seeing [Veritasium]’s video on Blackbird, [Professor Kusenko] contacted him and said the performance claims and explanation were incorrect. After a bit of debate [Veritasium] proposed a wager on the matter, which [Professor Kusenko] accepted, and it was made official with a written agreement witnessed by [Neil deGrasse Tyson], [Bill Nye], and [Sean Carrol]. From the start, it was agreed that the entire debate would be made public.

[Professor Kusenko] made a very thorough and convincing argument, backed by calculations, against the claims in the video. He claimed the observations were due to a combination of gusty winds, a vertical wind gradient. He was convinced and that the vehicle would not be able to maintain a speed higher than the wind, directly downwind. By [Veritasium]’s own admittance, his original video could have contained more details and proof of performance claims of the Blackbird vehicle. He added these to the latest video and included two model demonstrations. The model that brought the concept home for us is at 13:46 in the video, and substitutes the propeller for a large wheel being driven by a piece of lumber being bushed across it. The second model, built by [Xyla Foxlin] was designed to demonstrate the concept on a treadmill. The 4th version of [Xyla]’s model was the first to be successful after she found out from [Rick Cavallaro] that the key design detail is the Vehicle Speed Ratio, which must be 0.7 or less. It is the pitch of the propeller divided by the circumference of the driven wheel, assuming a 1:1 gear ratio. All the 3D files and details are available if you want to build your own downwind cart. Continue reading “$10 000 Physics Wager Settles The Debate On Sailing Downwind Faster Than The Wind” →

Sailing Faster Than The Wind Itself

June 6, 2021 by Jenny List 136 Comments

If you search the outer reaches of the internet you will find all sorts of web sites and videos purporting to answer to free energy in the form of perpetual motion machines and other fantastical structures that bend the laws of physics to breaking point. We’d love them to be true but we have [Émilie du Châtelet] and her law of conservation of energy to thank for dashing those hopes. So when along comes a machine that appears to violate a fundamental Law of Physics, it’s reasonably met with skepticism. But the wind-powered vehicle built by [Rick Cavallaro] looks as though it might just achieve that which was previously thought impossible. It’s a machine that can move with the wind at a speed faster than the wind itself.

A fundamental law of sailing boats is that when they are sailing with the wind, i.e. in the same direction as the wind, they can’t sail faster than the wind itself. Sailing boats can go faster than the wind powering them by sailing across it at an angle to create lift from their sails, but this effect doesn’t work as the angle tends towards that of the wind.

The vehicle in the video below the break is a sleek and lightweight machine with a large propeller above it, which we are told is not the windmill power source we might imagine it to be. Instead it mimics the effect of a pair of sailing boats sailing across the wind in a spiral around a long cylinder, and thus becomes in effect a fan when turned by the motoin in the craft’s wheels. The drive comes from the wind working on the craft itself, and thus as can be seen from the motion of a streamer on its front, it can overtake the wind. It seems too good to be true at first sight but the explanation holds water. Now we want a ride too!

For fairly obvious reasons, the fantastical world of pseudo-physics isn’t our bag here at Hackaday. But if something might hold promise we’ll at least give it a look. Not all such things we cover turn out to change those Laws of Physics, though.

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The Simplest Wind Turbine Is The Most Satisfying

April 7, 2021 by Jenny List 37 Comments

Sometimes there’s a satisfaction to be found not in the more complex projects but the simplest ones. We’ve featured wind turbines of all types here at Hackaday over the years, but HowToLou’s one is probably one of the least sophisticated. That notwithstanding, it does its job admirably, and provides a handy reminder of a parts source many of us might have overlooked.

At its heart is a motor from an exercise treadmill, which appears to be quite a powerful DC motor so that’s a source worth noting away for any future projects. To that he attaches the blades from a desk fan, and when placed outdoors on a windy day it generates enough power to run an LED head torch and charge his phone.

Of course, this most basic of wind turbines is not displaying its true potential in the video below the break. Were it mounted in a high position free from ground based wind obstacles it would no doubt catch a lot more wind, and in particular were it hooked up to a charge controller and a battery it could provide a much more useful power source. Then you could start optimizing fan blade designs… But this is a fun project that isn’t trying to masquerade as anything sophisticated, and it still has that potential.

This isn’t the first such simple turbine we’ve brought you.

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Typhoon-Tough Turbines Withstand Wild Winds

October 7, 2020 by Kristina Panos 25 Comments

It’s really beginning to feel as though the problem of climate change is a huge boulder rolling down a steep hill, and we have the Sisyphean task of trying to reverse it. While we definitely need to switch as much of the planet over to clean, green energy as soon as possible, the deployment should be strategic. You know, solar panels in sunny places, and wind turbines in windy places. And for the most part, we’re already doing that.

A test unit in Okinawa, Japan. Image via Challenergy

In the meantime, there are also natural disasters to deal with, some of which are worsened by climate change. Eastern and Southeast Asian countries are frequently under the threat of typhoons that bring strong, turbulent winds with them. Once the storms pass, they leave large swaths of lengthy power outages in their wake.

Studies have shown that these storms are gaining strength over the years, leading to more frequent disruption of existing power systems in those areas. Wind power is the ideal solution where storms have come through and knocked out traditional power delivery all over a region. As long as the turbines themselves can stand up to the challenge, they can be used to power micro-grids when other delivery is knocked out.

Bring On the Typhoons?

Unfortunately, the conventional three-bladed wind turbines you see dotting the plains can’t stand up to the awesome power of typhoons. But vertical axis wind turbines can. Though they have been around for many years, they may have finally found their niche.

A Japanese startup called Challenergy wants to face the challenge of typhoons head on. They’ve built a vertical axis wind turbine that’s built to not only to withstand typhoon-level winds, it’s designed to make the most of them. Instead of horizontally-situated blades arranged like spokes or flower petals, these turbines have vertical cylinders that collect wind by harnessing the Magnus effect.

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