Driving BB-8: More Than One Way To Move This Bot

June 24, 2016 by Steven Dufresne 30 Comments

BB-8 is the much loved new droid introduced in the 2016 movie Star Wars: The Force Awakens, though in my case from the very first trailer released in 2014 I liked it for the interesting engineering problems it posed. How would you make a robot that’s a ball that rolls along, but with a head that stays on top while the ball rolls under it?

BB-8 in 1st Star Wars: The Force Awakens trailer

Hamster in hamster wheel

To make the ball roll, the answer most people found obvious at first was to use the analogy of a hamster wheel. The hamster running inside makes the wheel turn. In the BB-8 building world, which is quite large, the drive mechanism has come to be called a hamster drive, or just a hamster.

For the head, it seemed obvious that there would be magnets inside the ball, perhaps held in place near the top of the ball by a post extending up from the hamster. Corresponding magnets in attraction would then be attached to the underside of the head, and balls (also mounted under the head) would keep the head moving smoothly over the ball.

The magnet approach for the head has turned out to be the method used by all BB-8 builders that I’ve seen. However, the hamster has turned out to be only one of multiple solutions. Since the original debut many different methods have been used in builds and we’re going to have a lot of fun looking at each separate approach. It’s almost like revealing a magic trick; but really it’s all just clever engineering.

Note that for the actual movie, a combination of 7 or 8 props and CGI were used. The official working BB-8s that are shown at various promotional events were built after the movie was made and as of this writing, few details of their construction have been released. One notable detail, however, is that they aren’t using hamster drives.

Below are details of all the different BB-8 drive systems I’ve seen so far that have been built along with how they work.

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Supplyframe Design Lab Opens Its Doors

June 23, 2016 by Mike Szczys 22 Comments

Today marks the opening of the Supplyframe Design Lab in Pasadena, California. The Design Lab bills itself as the “leading edge creative center built to foster new ideas in technology and design”. Supplyframe had the vision to acquire Hackaday a few years ago, launched the Hackaday.io Community site which now has more than 150,000 members, and established The Hackaday Prize to spark engineering projects that benefit humanity. Pay attention to the Design Lab; looking back on this day you’re going to be able to say that you remember when it all started.

Othermills lined up and ready to go

SeeMeCNC Rostock Max V2 and Deezmaker Bukito 3D Printers

Shopbot, Tormach, and Woodworking Tools

The equipment enshrined in the new space is spectacular. Name your material, and there are tools to work with it. Working with electronics? Mill your prototypes on a number of OtherMills available. Custom enclosure? Take your pick of milling it on the Tormach, PolyJet printing it on the Statasys, or FDM printing with a number of different high-end 3D printers. Need design software and beefy boxes to run it on? They have that too. Working in wood? A shopbot awaits you, as do traditional tools like a tablesaw, routers, sanders, etc. It’s a wonderland for making the imaginable real. If there ever was a time to quit your job and spend three months launching that dream product, this is it. The Design Lab has a residency program.

Supplyframe is all about enabling hardware creation. This is what sites like Parts.io and Findchips.com do: provide powerful tools for hardware engineers to better use their design skills. Founding a space like the Design Lab is a natural extension of this. Providing a work area, mentorships, and funding residencies breaks down the barriers that can prevent new hardware seeing the light of day. The Design Lab solves the issues of tools, materials, and hands-on experience that plague many a new hardware company.

Residencies will start on July 1st. Each runs for three months in which residents have unfettered access to the space and its tools, as well as financial support of $2000 per month. Each resident will self-identify into the product-track (you’re on your way to market with new hardware) or the art-track (you have a calling for an ambitious project and need to make it a reality). So far the Design Lab page lists three residents; a network of low-cost air quality sensors called Scintilla, a music synthesizer based around Teensy 3 called NanoEgg, and a mixed-reality public arts initiative called Perceptoscope. The Design Lab is still accepting applications for new residencies this summer and beyond — one of these residencies will also be offered to the Grand Prize winner of the 2016 Hackaday Prize.

A Hacker’s Guide To Getting Old

June 22, 2016 by Dan Maloney 95 Comments

It’s no surprise that things change as we age, and that tasks that were once trivial become difficult. Case in point: my son asked for help with the cord on his gaming headset the other night. The cable had broken and we could see frayed conductors exposed. When I got it apart, I found that I could barely see the ultra-fine wires to resolder them after cutting out the bad section. I managed to do it, but just barely.

This experience got me thinking about how to deal with the inevitable. How do you stay active as a hacker once your body starts to fight you more than it helps you? I’m interested mostly in dealing with changes in vision, but also in loss of dexterity and fine motor skills, and dealing with cognitive changes. This isn’t a comprehensive list of the ravages of time, but they’re probably the big ones that impact any hacker-related hobby. I enlisted a couple of my more seasoned Hackaday colleagues, [Bil] and [Rud], for their tips and tricks to deal with these issues.

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Capacitors Made Easy The Hackaday Way

June 21, 2016 by Jenny List 66 Comments

If you build electronic circuits on a regular basis the chances are you will have used capacitors many times. They are a standard component along with the resistor whose values are lifted off the shelf without a second thought. We use them for power supply smoothing and decoupling, DC blocking, timing circuits, and many more applications.

Different capacitor applications. By Elcap (Own work) [CC0], via Wikimedia Commons

A capacitor though is not simply a blob with two wires emerging from it and a couple of parameters: working voltage and capacitance. There is a huge array of capacitor technologies and materials with different properties. And while almost any capacitor with the right value can do the job in most cases, you’ll find that knowing more about these different devices can help you make something that doesn’t just do the job, but does the best possible job. If you’ve ever had to chase a thermal stability problem or seek out the source of those extra dBs of noise for example you will appreciate this.

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Network Security Theatre

June 20, 2016 by Brian Benchoff 8 Comments

Summer is nearly here, and with that comes the preparations for the largest gathering of security researchers on the planet. In early August, researchers, geeks, nerds, and other extremely cool people will descend upon the high desert of Las Vegas, Nevada to discuss the vulnerabilities of software, the exploits of hardware, and the questionable activities of government entities. This is Black Hat and DEF CON, when taken together it’s the largest security conference on the planet.

These conferences serve a very important purpose. Unlike academia, security professionals don’t make a name for themselves by publishing in journals. The pecking order of the security world is determined at these talks. The best talks, and the best media coverage command higher consultancy fees. It’s an economy, and of course there will always be people ready to game the system.

Like academia, these talks are peer-reviewed. Press releases given before the talks are not, and between the knowledge of security researchers and the tech press is network security theatre. In this network security theatre, you don’t really need an interesting exploit, technique, or device, you just need to convince the right people you have one.

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How Lasers Actually Work

June 20, 2016 by Moritz Walter 36 Comments

Lasers are optical amplifiers, optical oscillators, and in a way, the most sophisticated light source ever invented. Not only are lasers extremely useful, but they are also champions of magnitude: While different laser types cover the electromagnetic spectrum from radiation (<10 nm) over the visible spectrum to far infrared light (699 μm), their individual output band can be as narrow as a few µHz. Their high temporal and spatial coherence lets them cover hundreds of meters in a tight beam of lowest divergence as a perfectly sinusoidal, electromagnetic wave. Some lasers reach peak power outputs of several exawatts, while their beams can be focused down to the smallest spot sizes in the hundreds and even tens of nanometers. Laser is the acronym for Light Amplification by Stimulated Emission Of Radiation, which suggests that it makes use of a phenomenon called stimulated emission, but well, how exactly do they do that? It’s time to look the laser in the eye (Disclaimer: don’t!).

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Evaluating The Unusual And Innovative Perf+ Protoboard

June 16, 2016 by Donald Papp 56 Comments

Back in 2015 [Ben Wang] attempted to re-invent the protoboard with the Perf+. Not long afterward, some improvements (more convenient hole size and better solder mask among others) yielded an updated version which I purchased. It’s an interesting concept and after making my first board with it here are my thoughts on what it does well, what it’s like to use, and what place it might have in a workshop.

Perf+ Overview

One side of a Perf+ 2 board. Each hole can selectively connect to bus next to it with a solder bridge. The bus strips are horizontal on the back side. — One side of a Perf+ board. Each hole can selectively connect to the bus next to it with a solder bridge. These bus strips are vertical. The ones on the back are horizontal.

The Perf+ is two-sided perfboard with a twist. In the image to the left, each column of individual holes has a bus running alongside. Each hole can selectively connect to its adjacent bus via a solder bridge. These bus traces are independent of each other and run vertically on the side shown, and horizontally on the back.

Each individual hole is therefore isolated by default but can be connected to one, both, or neither of the bus traces on either side of the board. Since these traces run vertically on one side and horizontally on the other, any hole on the board can be connected to any other hole on the board with as few as two solder bridges and without a single jumper wire.

It’s an innovative idea, but is it a reasonable replacement for perfboard or busboard? I found out by using it to assemble a simple prototype.

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