Hackaday Links: June 29, 2014


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.

10 thoughts on “Hackaday Links: June 29, 2014

  1. 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.

    1. 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…

      1. 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?

        1. 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)

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