Draw Your Own Vinyl Beats

October 26, 2012 by Mike Szczys 13 Comments

The Dyskograf lets you make music with a magic marker. The musical installation looks much like a turntable for playing vinyl records. But instead of a spiraling groove containing the sounds, this uses marks on a paper disk to play sound samples.

You can see the light outline of several tracks on the paper disc shown above. By adding black marks the optical input of the Dyskograf knows when to start and end each sound. This is best illustrated in the video demonstration after the break.

The marker-based setup makes a lot of sense, and we think it would be perfect if the disc was a dry-erase board. It certainly makes it a lot easier to lay down new beats than this other optical turntable which required holes to be drilled in a vinyl record to play the sounds. While we’re on the topic you may also find this coin-based turntable sequencer of interest.

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Halloween Props: A Spooky Mirror

October 26, 2012 by Mike Szczys 5 Comments

This mirror will spook your guests with a variety of static and animated images. It includes a proximity sensor so the images will not appear until someone comes close enough to see themselves in the looking glass.

The electronic parts are quite easy to put together. There is a 32×32 RGB LED matrix mounted on the back of the mirror. It is driven by an IOIO board with some custom firmware written by [Ytai], the creator of that board who happens to live next door to [Alinke]. Where this starts to get interesting is when [Alinke] was working on the mirror to make the LEDs visible from the front. He used a razor knife to put hundreds of scratches in the varnish on the back. This lets just enough light through to see the LEDs, but keeps the mirrored surface reflective. See for yourself in the clip after the break.

The images are fed to the IOIO board by an Android device. We think this could have a lot of use after Halloween as a weather display or news ticker. Perhaps you could even feed it from your diy Android thermostat.

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AM Chiptunes Played By A Modified Antenna Analyzer

October 26, 2012 by Mike Szczys 5 Comments

Believe it or not, this VK5JST aerial analyzer kit is going to rickroll you. [Erich] wanted to see if he could use the device in a different way. His adventure led him to use it to feed different tones to an AM radio, producing the all too familiar [Rick Astley] offering.

There’s a fair bit of math that goes into getting the correct signals to generate a given pitch. But it basically boils down to patching into the hardware early in the RF generation. This way an audio signal can be rolled into the carrier frequency. Since this kit uses a PicAXE microcontroller with available source code it is rather easy to add audio input to tweak what the chip is putting out. But there is also some hardware tinkering to be done. Read more about that at the article linked above, and don’t forget to check out the bottom of that page to hear the final results.

DARPA Funded Robot Ninja Warrior?

October 26, 2012 by Mike Szczys 23 Comments

Fans of the game show Ninja Warrior will immediately recognize the similarity of this test apparatus as the Spider Climb. Of course that’s not a human contestant, but a humanoid robot developed by Boston Dynamics. And it’s not actually clinging to the vertical walls as its only support. There are two narrow ledges to either side on which its feet gain purchase. Nonetheless this is some impressive work to keep itself upright and avoid slipping. Check out the video after the break to see how it does.

The sheer volume of amazing robot tech that this company spits out is remarkable. Just last month we saw the robotic cheetah which can run at almost 30 mph. We don’t expect to see either in the wild anytime soon, but especially this humanoid. you’ll notice the red rings positioned around the apparatus. We believe these are high-speed cameras set up to give the robot positional feedback and we’d wager it can’t perform without them. But that’s merely conjecture so judge for yourself.

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PCA9517 I2c Translator A Perfect Companion For Raspberry Pi Hardware Add-ons

October 26, 2012 by Mike Szczys 10 Comments

The rig pictured above works as an Internet connected temperature sensor which sends [Zaion] an email with a graph of the change over time. This in itself is interesting, but one part in particular caught our eye. He’s using an i2c temperature sensor , and we think the PCA9517 Level-Translating I2C Bus Repeater that makes it possible is a perfect match for the RPi.

This is a Texas Instruments part. You can find more about it from the company’s product page. The key words in the name of the chip are ‘Level-Translating’. This has two bus connections, each with variable voltage levels. On side A the bus can be 0.9V to 5.5V. On side B the bus range is 2.7V to 5.5V. Since the Raspberry Pi I/O pins operate at 3.3V this could connect to the B side, give you the ability to interface with i2c parts rated for lower or higher voltages. This is especially handy for folks who started with the Arduino and own mostly 5V compliant prototyping hardware.

The part comes in a SOIC package, which you can easily hand solder and will costs around $1 depending on the supplier.

Find A Way To Stop Robocalls To Grab This $50k Prize

October 26, 2012 by Mike Szczys 111 Comments

Here’s a challenge tailored to our community if we’ve ever seen one. You know those delightful unsolicited prerecorded calls you get from time to time? They might be political, but they also come from companies trying to sell you vinyl siding, or promising improvements in your business. Well they’re against the law in many cases, and complaints to the Federal Trade Commission have been piling up. So now the FTC is offering a $50,000 bounty to anyone who can find a way to block the calls.

It’s called the Robocall Challenge and you’ve got until January 17th, 2013 to get your entry submitted. The great thing is, this doesn’t need to be a fully working solution. Your entry may be: “proposed technical solutions or functional solutions and proofs of concept “. Even better, you retain ownership of the solution even if you win. This type of recognition will surely have telco related companies beating a path to your door.

Of course if you do have a solution, we’d love to hear about it too!

[Thanks Filespace via WCPO]

Tell Us What Development Board You Love

October 26, 2012 by Caleb Kraft 194 Comments

Back in 2011 we did a short roundup of some popular development boards. We promised a follow up at some point, and that time is near. We would really like to make this a fairly comprehensive list and there are always suggestions sent in after the article that we overlooked.

This time, we’re asking that you tell us what dev boards you prefer and why. Either reply in the comments or email us directly at boards@hackaday.com. We’ll round up all of your suggestions and bring you the “development board brakedown for 4th quarter 2012”.

Please keep in mind that we can’t possibly know everything about every single board out there, so if there’s some special feature of a board that you love, be sure to let us know!