Turning A Typewriter Into A Mechanical Keyboard

August 27, 2015 by 18 Comments

Is your keyboard too quiet? Is your Cherry MX Blue board not driving your coworkers crazy enough? If the machine gun fire of a buckling spring keyboard isn’t enough for you, there’s only one solution: [Russell]’s typewriter turned into a mechanical keyboard.

Converting typewriters into keyboards has been done for a very long time; teletypes, the first computer keyboards, were basically typewriters, and the 1970s saw a number of IBM Selectrics converted into a keyboard with serial output. Even in recent years, typewriters have been converted into keyboards with the help of some switches and an ATMega. [Russell]’s mechanical keyboard improves on all of these builds by making the electronic interface dead simple, and a project that can be done by anyone.

Instead of installing switches underneath every key or futzing about with the weird mechanics of a Selectric typewriter, [Russell] is only installing a touch-sensitive position sensor into the frame of the typewriter. When a key is pressed, it strikes a crossbar in the frame of the typewriter. With a single ADC chip and a Raspberry Pi, [Russell] can determine which key was pressed and use that information to output a character to a terminal.

It’s a very simple solution for an electrical interface to a mechanical device, and the project seems to work well enough. [Russell] is using his new keyboard with Vim, even, something you can check out in the video below.

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Update: What You See Is What You Laser Cut

August 26, 2015 by 41 Comments

If there’s one thing about laser cutters that makes them a little difficult to use, it’s the fact that it’s hard for a person to interact with them one-on-one without a clunky computer in the middle of everything. Granted, that laser is a little dangerous, but it would be nice if there was a way to use a laser cutter without having to deal with a computer. Luckily, [Anirudh] and team have been working on solving this problem, creating a laser cutter that can interact directly with its user.

The laser cutter is tied to a visual system which watches for a number of cues. As we’ve featured before, this particular laser cutter can “see” pen strokes and will instruct the laser cutter to cut along the pen strokes (once all fingers are away from the cutting area, of course). The update to this system is that now, a user can import a drawing from a smartphone and manipulate it with a set of physical tokens that the camera can watch. One token changes the location of the cut, and the other changes the scale. This extends the functionality of the laser cutter from simply cutting at the location of pen strokes to being able to cut around any user-manipulated image without interacting directly with a computer. Be sure to check out the video after the break for a demonstration of how this works.

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Microsoft Display Cover

E-Ink Display Moves On-Screen Controls Off-Screen

August 26, 2015 by 37 Comments

Tablet computers have come a long way, long way. It finally seems like they’ve found their niche in the market, and now maybe they can catch up to more traditional computers. The Microsoft Applied Sciences division came up with a cool prototype design for a new tablet, one with a secondary e-ink input display.

The tablet interface makes use of e-ink strip above the keyboard. While it might not seem like much, this frees up a bunch of screen real estate, allowing you to have various icons and shortcuts off screen. It makes a ton of sense for digital artists as they can draw on the screen, but also have their toolkit open right below them — almost like real painting/drawing.

One of the other great uses for something like this is a signature pad — with everything going digital, when is the last time you had to print, sign, and scan a document back to someone? They even developed a dedicated email app you can use solely on the e-ink screen, allowing you to maximize the use of your main screen for something like a video chat.

The demo is pretty cool, and we often wonder why there aren’t more phones with e-ink displays integrated into them — is this just the beginning?

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Sphero Riding Strandbeest Is A Robot With An Exoskeleton

August 26, 2015 by 14 Comments

[Theo Jansen] makes awesome things called Strandbeests; wind-driven automatons that roam beaches and art galleries. It has long been one of our favorite mechanisms. Newer, but also a favorite is the Sphero smartphone controlled orb. The combination of the two is epic!

You may remember seeing Sphero used to create a tiny BB8 replica. Inside the orb is a tiny robot capable of rolling itself hamster-wheel-style in any direction. It’s a rather powerful bot and that makes Sphero fast. The high RPM is what makes this hack possible. Sphero spins rapidly while perched on some rollerblade wheels. Gearing converts this to the rolling motion of the Strandbeest.

The original concept was posted a year ago but it was just now brought to our attention by [fhareide]  who is working on his own smaller Strandbeest driven by a Sphero. Since there are no assembly details on the original posting, you can follow along with [fhareide’s] documentation in order to complete your own build. So far [fhareide] imported the STL model into Autodesk Inventor, printed out one set of gears to insure the printer resolution could handle it, and assembled one set of legs.
We think of this as a kind of exoskeleton for a Sphero. We’ll keep an eye on this through the assembly, testing the drive mechanism and then the point where the whole thing becomes self-aware and either runs away to hide or terminates him.

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graph

We Have A Problem: Earthquake Prediction

August 26, 2015 by 71 Comments

Nepal | 25 April 2015 | 11:56 NST

It was a typical day for the 27 million residents of Nepal – a small south Asian country nestled between China and India. Men and women went about their usual routine as they would any other day. Children ran about happily on school playgrounds while their parents earned a living in one of the country’s many industries. None of them could foresee the incredible destruction that would soon strike with no warning. The 7.8 magnitude earthquake shook the country at its core. 9,000 people died that day. How many didn’t have to?

History is riddled with earthquakes and their staggering death tolls. Because many are killed by collapsing infrastructure, even a 60 second warning could save many thousands of lives. Why can’t we do this? Or a better question – why aren’t we doing this? Meet [Micheal Doody], a Reproductive Endocrinologist with a doctorate in steel rodphysical biochemistry. While he doesn’t exactly have the background needed to pioneer a novel approach to predict earthquakes, he’s off to a good start.

He uses piezoelectric pressure sensors at the heart of the device, but they’re far from the most interesting parts. Three steel balls, each weighing four pounds, are suspended from a central vertical post. Magnets are used to balance the balls 120 degrees apart from each other. They exert a lateral force on the piezo sensors, allowing for any movement of the vertical post to be detected. An Arduino and some amplifiers are used to look at the piezo sensors.

The system is not meant to measure actual vibration data. Instead it looks at the noise floor and uses statistical analysis to see any changes in the background noise. Network several of these sensors along a fault line, and you have yourself a low cost system that could see an earthquake coming, potentially saving thousands of lives.

[Michael] has a TON of data on his project page. Though he’s obviously very skilled, he is not an EE or software guy. He could use some help with the signal analysis and other parts. If you would like to lend a hand and help make this world a better place, please get in touch with him.

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Retrotechtacular: The Hammond Novachord

August 26, 2015 by 20 Comments

Just when we thought we’d heard of all the cool early synthesizers, a tipster rattled our jar with news that someone completely restored a Novachord. These spinet piano-shaped prototypical synthesizers were made by Hammond for only four years. About a thousand of them were built before sales sagged and parts became scarce in 1942. It is estimated that only 200 or so are still around today.

The Novachord’s sounds are generated by a bank of twelve monostable vacuum tube oscillators. Each one is tuned to a pitch of the chromatic scale in what is called divide-down architecture. [Hammond] and his co-creators [John Hanert] and [C.N. Williams] used the property of dividing a frequency in half to generate the same tone, but one octave lower. This design means that all 72 notes can be played at the same time. Adjustable formant filters shape the often otherworldly sounds, which are then passed through flexible tube-based envelopes.

[Phil] knew it would be a big job to restore a Novachord in any condition. Thousands of passive components all had to be replaced. The cabinet bore all the hallmarks of a well-used parlor instrument—water rings from cocktails, scratches, and cigarette burns galore. [Phil] says that woodworking really isn’t his thing, but he did an outstanding job nonetheless of sanding every nook and cranny and applying several coats of stain. There are tons of drool-inducing pictures on his project site, and several clips of [Phil] really putting it through its paces.

Thanks for the tip, [Mike]!

Retrotechtacular is a weekly column featuring hacks, technology, and kitsch from ages of yore. Help keep it fresh by sending in your ideas for future installments.