How To Build The Strongest Arches

October 15, 2019 by Sharon Lin 13 Comments

When it comes to architectural features, there are probably not many as quintessentially memorable as arches. From the simplicity of the curved structure to the seemingly impossible task of a supposedly collapsable shape supporting so much weight in mid-air, they’ve naturally fascinated architects for generations.

For civil engineers, learning to calculate the forces acting on an arch, the material strength and properties, and the weight distribution across several arches may be familiar, but for anyone with only a basic physics and CAD background, it’s easy to take arches for granted. After all, they grace the Roman aqueducts, the Great Wall of China, and are even present in nature at Arches National Park. We see them in cathedrals, mosques, gateways, and even memorialized in the case of the St. Louis Gateway Arch. Even the circular construction of watch towers and wells, as well as our own rib cages, are due to the properties of arches.

But what really goes into constructing a strong arch? Continue reading “How To Build The Strongest Arches” →

Clean Water Technologies Hack Chat

September 3, 2019 by Dan Maloney 2 Comments

Join us on Wednesday, September 4th at noon Pacific for the Clean Water Technologies Hack Chat with Ryan Beltrán!

Access to clean water is something that’s all too easy to take for granted. When the tap is turned, delivering water that won’t sicken or kill you when you drink it, we generally stop worrying. But for millions around the world, getting clean water is a daily struggle, with disease and death often being the penalty for drinking from a compromised source. Thankfully, a wide range of water technologies is available to help secure access to clean water. Most are expensive, though, especially at the scale needed to supply even a small village.

Seeing a need to think smaller, Ryan started MakeWater.org, a non-profit program that seeks to give anyone the power to make clean water through electrocoagulation, or the use of electric charge to precipitate contaminants from water. There’s more to MakeWater than electrocoagulation kits, though. By partnering with STEM students and their teachers, MakeWater seeks to crowdsource improvements to the technology, incorporating student design changes into the next version of the kit. They also hope to inspire students to develop the skills they need to tackle real-world problems and make a difference in the lives of millions.

Our Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, September 4 at 12:00 PM Pacific time. If time zones have got you down, we have a handy time zone converter.

Click that speech bubble to the right, and you’ll be taken directly to the Hack Chat group on Hackaday.io. You don’t have to wait until Wednesday; join whenever you want and you can see what the community is talking about.

Parallax Update Hack Chat

August 26, 2019 by Dan Maloney 8 Comments

Join us on Wednesday, August 28th at noon Pacific for the Parallax Update Hack Chat with Chip and Ken Gracey!

For a lot of us, our first exposure to the world of microcontrollers was through the offerings of Parallax, Inc. Perhaps you were interested in doing something small and light, and hoping to leverage your programming skills from an IBM-PC or an Apple ][, you chanced upon the magic of the BASIC Stamp. Or maybe you had a teacher who built a robotics class around a Boe-Bot, or you joined a FIRST Robotics team that used some Parallax sensors.

Whatever your relationship with Parallax products is, there’s no doubting that they were at the forefront of the hobbyist microcontroller revolution. Nor can you doubt that Parallax is about a lot more than BASIC Stamps these days. Its popular multicore Propeller chip has been gaining a passionate following since its 2006 introduction and has found its way into tons of projects, many of which we’ve featured on Hackaday. And now, its long-awaited successor, the Propeller 2, is almost ready to hit the market.

The Gracey brothers have been the men behind Parallax from the beginning, with Chip designing all the products and Ken running the business. They’ll be joining us on the Hack Chat to catch us up on everything new at Parallax, and to give us the lowdown on the P2. Be sure to stop be with your Parallax questions, or just to say hi.

Our Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, August 28 at 12:00 PM Pacific time. If time zones have got you down, we have a handy time zone converter.

A Faithful Replica Of An Early Computer Trainer

June 17, 2019 by Dan Maloney 11 Comments

Turn the clock back six decades or so and imagine you’re in the nascent computer business. You know your product has immense value, but only to a limited customer base with the means to afford such devices and the ability to understand them and put them to use. You know that the market will eventually saturate unless you can create a self-sustaining computer culture. But how does one accomplish such a thing in 1961?

Enter the Minivac 601. The brainchild of no less a computer luminary than Claude Shannon, the father of information theory, the Minivac 601 was ostensibly a toy in the vein of the “100-in-1” electronics kits that would appear later. It used electromechanical circuits to teach basic logic, and now [Mike Gardi] has created a replica of the original Minivac 601.

Both the original and the replica use relays as logic switches, which can be wired in various configurations through jumpers. [Mike]’s version is as faithful to the original as possible with modern parts, and gets an extra authenticity boost through the use of 3D-printed panels and a laser-cut wood frame to recreate the look of the original. Sadly, the unique motorized rotary switch, used for both input and output on the original, has yet to be fully implemented on the replica. But everything else is spot on, and the vintage look is great. Extra points to [Mike] for laboriously recreating the original programming terminals with solder lugs and brass eyelets.

We love seeing this retro replica, and appreciate the chance to reflect on the genius of its inventor. Our profile of Claude Shannon is a great place to start learning about his other contributions to computer science. We’ve also got a deeper dive into information theory for the curious.

Thanks to [Granz] for the tip.

Learn Digital Logic By Alien Abduction

March 14, 2019 by Al Williams 21 Comments

Some of the best educational material we’ve seen tells a story. There’s something more fun about reading a story than just absorbing a bunch of dry facts. That’s the idea behind Adventures in Logic Land. In the first episode, you are abducted by aliens trying to decide if humans are intelligent. To prove that, you have to work a series of logic puzzles.

The approach is a little unorthodox. You are shown a live logic simulation (spoiler: it is a NOR gate) and you have to fill in a truth table. The gates use alien symbols which contributes to the storyline but perhaps isn’t the best choice from an educational perspective. Besides, they already use red for zero and green for one which seems a little culturally-specific. The next test shows you how to build your own little simulations and run tests to see if they meet the alien’s criteria.

Continue reading “Learn Digital Logic By Alien Abduction” →

Expert Says Don’t Teach Kids To Code

March 14, 2019 by Al Williams 220 Comments

I was a little surprised to see a news report about Andreas Schleicher, the director of education and skills at OECD — the Organization for Economic Cooperation and Development. Speaking at the World Innovation Summit for Education in Paris, Schleicher thinks that teaching kids to code is a waste of time. In particular, he seems to think that by the time a child today grows up, coding will be obsolete.

I can’t help but think that he might be a little confused. Coding isn’t going away anytime soon. It could, of course, become an even deeper specialty, and thus less generally applicable. But the comments he’s made seem to imply that soon we will just tell smart computers what we want and they will just do that. Somewhat like computers work on Star Trek.

What is more likely is that most people will be able to find specific applications that can do what they want without traditional coding. But someone still has to write something for the foreseeable future. What’s more, if you’ve ever tried to tease requirements out of an end user, you know that you can’t just blurt out anything you want to a computer and expect it to make sense. It isn’t the computer’s fault. People — especially untrained people — don’t always make sense or communicate unambiguously.

Continue reading “Expert Says Don’t Teach Kids To Code” →

Back To School Online

November 10, 2018 by Al Williams 6 Comments

In 1961, FCC Commissioner [Newt Minow] famously described TV as a “vast wasteland.” But TV can do great things; educational programming, news coverage, and great performances do appear, just not all that often. You can draw the same parallels to the Internet. Sure, it’s mostly cat pictures, snarky comments, and posts of what your friends had for dinner. But it can also be a powerful tool, especially for education. Recently, top-name schools and other institutions have posted courses online for everything from Python to Quantum Mechanics to Dutch. The problems are finding these classes and figuring out which ones are gems and which are duds. A site called Class-Central aims to solve these problems.

The site aggregates class descriptions from a variety of sources like edX, Coursea, and more. Users can rate the classes. Many of these courses are free to take. The recent trend is to offer the content for free, but charge for people who want an assessment, such as a certificate of completion or even a full-blown degree. Even then, the cost is typically far less than traditional college costs.

There’s also news about courses. For example, a recent post highlighted that edX now offers nine online master’s degrees in conjunction with major schools. A computer science masters from the University of Texas, for example, runs about $10,000. A Georgia Tech cybersecurity masters degree costs even less. There are another seven not ready yet, including one for electrical engineering.

Continue reading “Back To School Online” →