Flying Wing Project uses 3D Printing to Reach New Heights

A team of engineers from the Advanced Manufacturing Research Centre at the University of Sheffield have just put the finishing touches on their 3D printed Flying Wing with electric ducted fan engines — a mini electric jet so to speak.

Earlier this year they had created a completely 3D printed fixed wing UAV, which the new Flying Wing is based off of. Designed specifically for the FDM process, they were able to optimize the design so that all parts could be printed out in 24 hours flat using ABS plastic.

The new design also almost exclusively uses FDM technology — however the wings are molded carbon fibre… using a 3D printed mold of course!  The original glider weighed 2kg, and with the upgrades to the design, the Flying Wing weighs 3.5kg, with speed capabilities of around 45mph.

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Hybrid 50cc Ultracapacitor Scooter

We’re all familiar with hybrid gas-electric cars these days, but how about a hybrid scooter that uses supercapacitors instead of batteries? Our hats are off to [Alex] from Labs Bell for the almost entirely-DIY conversion.

The hybrid idea is to drive the vehicle’s wheels with electric motors, but generate the electricity with a normal gasoline engine. This allows the hybrid to control the engine speed almost independently of the wheel motors’ demand for power, allowing the gas engine to run at its most efficient speed and charge up batteries with the extra energy. As an extra bonus, many hybrids also use regenerative braking to recoup some of the energy normally wasted as heat in your brake pads.

[Alex]’s hybrid scooter does all of the above and more. Since the stock vehicle is a 50cc scooter, any increase in acceleration is doubtless welcome. We’d love to see the scooter starting from stop with a full charge. Using supercapacitors as storage instead of batteries is a win for charging efficiency. In urban stop-and-go traffic, the natural habitat of the 50cc scooter, the regenerative braking should help further with gas consumption.

What’s most impressive to us is the completely DIY hybrid control unit that takes some simple inputs (wheel speed and throttle position) and controls regenerative braking, the gas engine’s throttle, etc. Since the hybrid control system is currently under development, there’s even a button to switch between different trial algorithms on the fly. Very cool!

Oh yeah, and [Alex] points out the fire extinguisher on-board. He had occasion to use it for his hybrid motorcycle V1. Safety first!

8×8 LED Arrays Make for one Creepy Animated Pumpkin

[Michal Janyst] wrote in to tell us about a little project he made for his nephew in preparation for Halloween – a jack-o-lantern with facial expressions.

Pumpkin Eyes uses two MAX7219 LED arrays, an Arduino nano, and a USB power supply. Yeah, it’s pretty simple — but after watching the video you’ll probably want to make one too. It’s just so cute! Or creepy. We can’t decide. He’s also thrown up the code on GitHub for those interested.

Of course, if you want a bit more of an advanced project you could make a Tetris jack-o-lantern, featuring a whopping 8×16 array of LEDs embedded directly into the pumpkin… or if you’re a Halloween purist and believe electronics have no place in a pumpkin, the least you could do is make your jack-o-lantern breath fire.

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Who Will Win the Hackaday Prize? Judging Begins Tonight

It’s been a long road for each of the five finalists; but after tonight they can breathe easy. The last judging round of the 2014 Hackaday Prize begins at 11:50pm PDT.

Each finalist must finish documenting their project by that time as a cached version of each of the project pages will be sent off to our orbital judges. Joining the panel that judged the semifinal round is [Chris Anderson], CEO of 3D Robotics, founder of DIY Drones, former Editor-in-Chief of Wired, and technology visionary. These nine are charged with deciding who has built a project cool enough to go to space.

In case you’ve forgotten, the final five projects selected by our team of launch judges are:

  • ChipWhisperer, an embedded hardware security research device for hardware penetration testing.
  • Open Source Science Tricorder, a realization of science fiction technology made possible by today’s electronics hardware advances.
  • PortableSDR, is a compact Software Defined Radio module that was originally designed for Ham Radio operators.
  • ramanPi, a 3D printed Raman Spectrometer built around a Raspberry Pi.
  • SatNOGS, a global network of satellite ground stations.

The ultimate results of the judging will be revealed at The Hackaday Prize party we’re holding in Munich during Electronica 2014. We’re also holding an Embedded Hardware Workshop with Moog synths, robots, hacked routers, computer vision, and a name that’s official-sounding enough to convince your boss to give you the day off work. We hope to see you there!

Simple POV Bike Effects with WS2811 Strips

[Andrew] wrote in with a new take on the classic persistence of vision bike spoke hack. While many of these POV setups use custom PCBs and discrete LEDs, [Andrew]’s design uses readily available off-the-shelf components: WS2811 LED strips, an Arduino, an Invensense IMU breakout board, and some small LiPo batteries.

[Andrew] also implemented a clever method of controlling his lights. His code detects when the rider taps the brakes in certain patterns, which allows changing between different light patterns. He does note that this method isn’t incredibly reliable due to some issues with his IMU, so now he senses when the rider taps on the handlebars as well.

If you want to build your own bike POV setup, you’re in luck. [Andrew] wrote up detailed instructions that outline the entire build process. He also provides links to sources for each part to make building your own setup even easier. His design is pretty affordable too, coming in at just under $50 per wheel. Check out a video of [Andrew]’s setup in action after the break.

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Ask Hackaday: Sequences of Sequences



In a previous article, we talked about the idea of the invariant representation and theorized different ways of implementing such an idea in silicon. The hypothetical example of identifying a song without knowledge of pitch or form was used to help create a foundation to support the end goal – to identify real world objects and events without the need of predefined templates. Such a task is possible if one can separate the parts of real world data that changes from that which does not. By only looking at the parts of the data that doesn’t change, or are invariant, one can identify real world events with superior accuracy compared to a template based system.

Consider a friend’s face. Imagine they were sitting in front of you, and their face took up most of your visual space. Your brain identifies the face as your friend without trouble. Now imagine you were in a crowded nightclub, and you were looking for the same friend. You catch a glimpse of her from several yards away, and your brain ID’s the face without trouble. Almost as easily as it did when she was sitting in front of you.

I want you to think about the raw data coming off the eye and going into the brain during both scenarios. The two sets of data would be completely different. Yet your brain is able to find a commonality between the two events. How? It can do this because the data that makes up the memory of your friend’s face is stored in an invariant form. There is no template of your friend’s face in your brain. It only stores the parts that do not change – such as the distance between the eyes, the distance between the eye and the nose, or the ear and the mouth. The shape her hairline makes on her forehead. These types of data points do not change with distance, lighting conditions or other ‘noise’.

One can argue over the specifics of how the brain does this. True or not true, the idea of the invariant representation is a powerful one, and implementing such an idea in silicon is a worthy goal. Read on as we continue to explore this idea in ever deeper detail.

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The Solution to the 10th Anniversary Code

A few weeks ago, [1o57], a.k.a. [Ryan Clarke] gave a talk about puzzles, DEFCON, and turning crypto puzzles into an art form at our 10th anniversary party. Ever the trickster, [1o57] included a crypto challenge in his talk, and a few days after our little shindig, nobody had yet solved the puzzle. Finally, someone bothered to sit down and figure it out. We don’t know what [tahnok] won, but as [1o57] said, solving it is its own reward.

Some of the slides in the presentation had a few characters sitting off to the side for no apparent reason. [tahnok] put these together and came up with:


In cases like this, you might try a Caesar cipher, or just shifting characters to the left or right a certain number of places. Since [1o57] noted this was the tenth anniversary of Hackaday, [tahnok] tried that first:


It doesn’t look like much, but that’s only because the string is backwards. Tricky, tricky. tricky. With instructions to send a codeword to an email address, [tahnok] now needed to find a code word. There was one picture [1o57] put up on twitter that was still an unsolved part of the puzzle:


With no idea what these little stickmen are, he scoured google with variants of ‘stickmen code’ and ‘semaphore’ until he hit upon the Sherlock Holmes story, The Adventure of the Dancing Men. It’s a simple substitution cypher, translated to, “codeword psychobilly ciphers”

And that’s the entire puzzle. As far as we know, this took about a month to solve, and compared to the DEFCON challenges, was fairly simple. [1o57] will probably chime in down in the comments to tell everyone how many people have picked up on the clues and sent an email.