Control A Playlist With Your Mind

February 18, 2012 by Brian Benchoff 9 Comments

Because switching apps to change a song is such a taxing ordeal, [Oscar Celma] and [Ching-Wei Chen] decided to use their collective brainpower to change Last.FM playlists with their minds. They call their project Buddhafy, and it works by taking off-the-shelf EEG hardware and tying it into music streaming APIs.

For the build, the guys used a NeuroSky MindWave to read alpha waves inside [Oscar]’s head. The data from the MindWave was passed into a Python script that sends requests to the Last.FM and Spotify APIs. High alpha waves in brain wave patterns correspond with concentration or a deep meditative state. If [Oscar] concentrates very hard, he’ll be rewarded with calm and relaxing tunes. If [Oscar] loses focus, the music changes to the best song ever written.

The guys put up the slides from the presentation they gave at MusicHackDay in San Fransisco this last week. There’s also a video of their build in action; you can check that out after the break.

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Microswitch Keyboard Gives Those Lazy Thumbs A Workout

February 16, 2012 by Mike Szczys 23 Comments

Upon first sight there will be no doubt in anyone’s mind that this is a hacker’s keyboard. [Tim Tyler] built the odd-looking conglomeration of keys a few years ago with the goal of improving the man-machine interface. Why waste all that thumb space with just one long keyboard when you can have at least nine keys per thumb?

After some additional consideration this isn’t all that unorthodox. We’ve seen keyboards that split the hands; in fact you can buy them. This just adds the thumb matrices and that rack of programmable keys above the alpha-numeric portion. It’s rather organ-like with its multiple ranks, don’t you think? Check out the demonstration video after the break. It certainly has a keystroke sound that is all its own. The sound is different from the clackity “M” keyboard and its modern relatives thanks to the microswitches that make up each key.

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Building A Keyboard From Scratch

February 15, 2012 by Brian Benchoff 46 Comments

After over a year of work, [dmw] is nearly done with his Humble Hacker Keyboard. It’s a keyboard that has been influenced by some pretty crazy looking designs, but meets all of [dmw]’s needs for a compact, programmer-oriented key layout that’s easy to type on.

[dmw] posted a pseudo-build log over at the geekhack keyboard forums. Every single part of this keyboard is custom-made. The key caps were made by Signature Plastics, the case was made by Shapeways, and the custom PCB for the key switches came directly from Express PCB. The key switches are blue Alps sliders (one of the best key switches available) with a few white Alps switches taken from an old Apple keyboard.

After soldering a hundred diodes and switches, [dmw] installed a Teensy++ to convert the closing key switches to something his computer can understand. This turned out to be a perfect of the Teensy because of the USB peripheral libraries that already exist. The source is up on github, so if you’ve ever wanted to replace your Model M with something more ergonomic, here’s your chance.

Wireless Controllers For All Your Retro Systems

February 13, 2012 by Brian Benchoff 24 Comments

Remember those old wireless controllers made for the consoles of our youth like the NES and Super Nintendo? They didn’t work well, mostly owing to the fact they were built using the same infrared technology that is found in a remote control. Now that all the modern consoles are wireless, [micro] over at the nftgames forum decided to update his classic systems for wireless control.

The transmitters and receivers are built around an nRF24L01+ radio module that operates in the 2.4 GHz band. [micro] has the process of converting his controllers down to a science. He cuts the cord and wires the controller up to an AVR running at 16 MHz. The AVR sends this to the receiver where the button presses are sent through the original controller port. Basically, [micro] recreated a WaveBird controller for his NES, SNES, Saturn and N64.

The controllers are powered by internal lithium batteries, but the charging ICs are too expensive to put in each controller. To solve this problem, [micro] crafted a small external charging circuit that plugs into a 3.5mm jack on each controller. Check out [micro]’s controller demo after the break.

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Converting Transparency Sheets To An LCD Monitor

February 4, 2012 by Brian Benchoff 37 Comments

Apparently, there’s some sort of sporting event being televised this weekend that has been historically used as an excuse to buy a big-screen TV. [Joel] wanted a huge-screen TV on the cheap, so he converted an overhead projector to something he can use with his XBox.

Using a bare LCD panel with an overhead projector is a decades-old hack we’ve covered before. The basic idea is fairly simple, but we’ve never seen anything that could be considered a semi-permanent build. [Joel] started his project by picking up a surplus overhead projector for $25 and routing a cutting board to mount the LCD in. The bulb in the projector added a lot of heat, so three small fans are used to blow air between the projector glass and the LCD display.

[Joel] started off looking at the LumenLab DIY projector project, but considered that to be a terrible amount of work with a fairly high initial investment. If you don’t count the few LCDs [Joel] burned through while building his project, his projector was built for under $100. We’re loving the result and are sure it will be much appreciated at [Joel]’s LAN parties.

Telegraph Key Makes For A Fantastic Twitter Input

January 31, 2012 by Brian Benchoff 21 Comments

In the interests of interface archaeology, [Martin] sent in the Tworse Key, a telegraph key that posts to Twitter using Morse code. It’s a fantastic build that nearly looks like something out of the 1900s.

We’ve seen a ton of Morse keyboards over the years, but never one so well-engineered for a single purpose. The guts and brains of the Tworse Key is an Arduino Ethernet that connect to Twitter over the API. The Tworse Key automagically posts all the Morse messages to Twitter. The Tworse Key may have fallen off the table a few times in the past 24 hours, but we do see a few purposeful messages like ‘sos’ and [Bell]’s preferred telephone salutation.

We could say that nobody uses straight telegraph keys anymore, but outside a few hardcore CW HAM radio guys nobody uses Morse anymore. This isn’t meant to be used as an everyday input device, though. It’s more of an exercise in interface archaeology. That being said, an iambic key would be a far more ergonomic solution. Check out the video of the Tworse Key after the break.

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Easy Tactile Controls And Displays For Your Flight Simulator

January 30, 2012 by Mike Szczys 6 Comments

If you’ve been thinking of adding some tactile controls and readouts for your flight simulators this guide should give you the motivation to get started with the project. [Paul] explains how to build controls and connect them to the simulator data. He makes it look easy, and thanks the interface examples in his code it actually is.

Here he’s built the hardware using a Teensy controller board. The controller communicates via USB and the software is cross-platform. He’s controlling the heading information of the X-Plane simulator using the rotary encoder for fine adjustments and the buttons for increments of 100. But he doesn’t stop there. He’s working on an auto-throttle design that uses a servo motor to move the throttle lever. A potentiometer can be used to vary the throttle, with the servo mapped to the position of that knob. But it works both ways, dragging the virtual throttle on-screen will do the same.

This is one way to make flight simulators more interesting without devoting a whole room of your house to the cause. Don’t miss [Paul’s] fantastic demo video after the break.

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