Hackaday Links: June 29, 2014

hackaday-links-chain

Ever see a really cool build on YouTube with no build details at all? Frustrating, right? That’s us with the NES Keytar covering the Game of Thrones theme. He’s using a Raspi with the sound chip in the NES to do live chiptunes. Freakin’ awesome. There’s also the ST:TNG theme as well.

A few years ago the folks at Oculus had an idea – because of cellphones, small, high resolution displays are really cheap, so why not make VR goggles? At Google IO this week someone figured out everyone already has a cellphone, so just wrap it in some cardboard and call it a set of VR goggles. You can get a kit here, but the only difficult to source components are the lenses.

What happens when you put liquid nitrogen under a vacuum? Well, it should evaporate more, get colder, and freeze. Then it breaks up into solid nitrogen snow. No idea what you would do with this, but there ‘ya go. Oh, [NC], we’re going to need a writeup of that LN2 generator.

About a month ago, the House4Hack hackerspace in South Africa told us of their plans to bring a glider down from 20km above the Earth. They finally launched it, The CAA only allowed them to glide back from 6km (20,000 feet), but even from there the foam glider hit 230kph (124 knots). That’s a little impressive for a foam FPV platform, and we’re betting something with a larger wingspan would probably break a spar or something. Shout out to HABEX.

All the electronic dice projects we’ve seen have one thing in common: they’re not cubes. Thus uberdice. It’s six nine-pixel displays on the faces of a cube, powered by a battery, and controlled by an accelerometer. Yes, it is by far the most complicated die ever made, but it does look cool.

Comments

  1. Doc Oct says:

    The STTNG theme keytar video needs a small “c” at the end of it to work.

  2. peter says:

    It makes me sad to think that in the Land of the Free(tm but trying to spread elsewhere by force) , we are no longer able to do the glider project. Just this week, the FAA has made illegal first-person view flight. Very sad.

    • cr0sh says:

      Wouldn’t have mattered anyway; you’d likely have needed to post a flight plan or something just to loft the balloon (IIRC). At that point, filing the paperwork for the (semi-)autonomous FPV portion of the flight shouldn’t be any more difficult (?). Not that I think these new “rules” are sound and good, mind you…

  3. Hirudinea says:

    Google cell phone “VR Goggles”, congratulations google you just invented the Stereopticon! And I bet they get a patent on it!

    • David Krum says:

      About 2 years ago, when Palmer Luckey was working at my lab (at the USC Institute for Creative Technologies), we developed a cardboard virtual reality viewer for a smartphone. We also Open Sourced it.

      http://projects.ict.usc.edu/mxr/diy/fov2go-viewer/


      As Hirudinea says, these types of viewers have been done before and are all spiritual descendents of the Stereoopticon.

      • Whatnot says:

        What confuses me is that normal 3D viewers have to use prisms to slightly change the angle of view to aid the eye to view the 3D, because eyes don’t like to look straight ahead at nearby objects as I understand it. So how come viewers like these don’t need that? Is the aspherical lens enough? Is there any online info on this?

        • Blufires says:

          In any pair of spectacles (a 3d viewer is just a pair with +15 power next to a screen), de-centering the lenses from the pupils provides a prism effect. This applies to any lens. The reason they all use aspheric lenses is because +15 is a huge power (beyond what you can get for any normal spectacles), and an aspherical lens is generally thinner than a spherical lens.

          Here’s a calculator to determine the prism from decentration: http://www.opticampus.com/tools/induced.php

          BTW if anybody’s planning to build one themselves, the lenses you need are +15 (or 5x if you use magnifying glass lenses)

          • Whatnot says:

            How would a de-centered lens work as a diverting prism if it’s curved at both sides though? that makes no sense to me.

          • Whatnot says:

            Oh I forgot to say: thanks for the answer, I’ll be looking into the induced prism concept and it’s nice to have a lead like that.

  4. Tom says:

    Disappointed to see that Überdice got that ISO toothpick reference wrong. They probably meant this -> http://www.everyspec.com/COMML_ITEM_DESC/A-A-01000_A-A-01999/download.php?spec=A-A-1056B.012822.pdf. Probably as close as you’ll get to “ISO-4913″!

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 94,598 other followers