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Hack Your Door to Lock and Unlock via Text Message

PostDateIconSunday, 16 January 2011 01:00 | PostAuthorIconWritten by Jason Fitzpatrick | E-mail
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Keys are so last century. Hack your door to lock and unlock via text messages. 

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Last Updated (Sunday, 16 January 2011 19:09)

 

DIY: Low Cost 3D Video

PostDateIconSunday, 21 February 2010 18:06 | PostAuthorIconWritten by Ron Proctor & AmyJo Proctor | E-mail
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A low cost apparatus for capturing stereoscopic video is described and footage from the apparatus is presented in anaglyph form.

3dRigFront 3dRigRear

A piece of L-shaped extruded aluminum was cut to length and drilled. Cameras are attached with 1/4-20 panhead machine screws, 1/4" nylon washers, and 1/4-20 wingnuts. The apparatus is attached to a quick release shoe for use with a tripod.

Cameras are manually activated for simultaneous filming. A 6.5cm baseline is used (similar to human eye baseline). Longer baselines can be used to increase parallax when filming distant objects.

Left and right video channels are processed and composited in video editing software. Audiovisual cues are used to synchronize the video streams. Depth may be adjusted by changing the x-direction offset between the right and left video channels.

Total cost for cameras and materials: USD 250.

Anaglyph Video - Left Eye Red, Right Eye Blue

Parallel Stereo Pair



Video Production Notes

We started with two full color video channels (right and left) — anaglyph (the red/blue method) is not ideal, but it is accessible because you don't need a special screen (just special glasses). We'd like to try this with polarization or autostereo some time.

For the anaglyph version, we overlaid the two tracks in a video editor and set the compositing mode to "screen" (also known as "add" in some editors). We removed the red channel from the right, then we removed the blue and green channels from the left.

We also had to adjust the offset a little bit so the "focus" was on one of the middle birds. Whatever the two channels "line up" on will be the "focus," also known as the "screen plane depth." Whatever is in front of that will "pop out" and whatever is behind will "pop in."

The video editor we used was Adobe Premiere CS4, but you can also do this in cheaper / free software. We tried it in the video sequence editor in Blender (free at blender.org) and got a favorable result.


Components

  • 2x Kodak Zx1 Digital Camcorders
  • L-Shaped Extruded Aluminum
  • 2x 1/4" Nylon Washers
  • 3x 1/4-20 Wingnuts
  • 2x 1/4-20 Panhead Machine Screws
  • Tripod with Quick Release Shoe

3dRigBuild


The Scientific Analysis and Visualization Initiative at  Weber State University

Source: savi.weber.edu
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Last Updated (Monday, 22 February 2010 17:10)

 

Guitar Hero as an instrument or midi controller

PostDateIconSaturday, 06 February 2010 10:04 | PostAuthorIconWritten by Mike Szczys | E-mail
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[Robert] wrote a program using Max/MSP that lets him make music with his guitar hero controller. There’s another video after the break where he walks through the various features but here’s the gist of it. This works on Mac and Windows and allows a sort of ‘live play’ or midi mapping mode. In the midi mode each key can be configured to do your bidding. His example uses the pick bar to scroll through different samples and the green button the play them or the red button to stop.

The live mode us much more involved. In the software you choose the type of scale and the key you’d like to play in. This makes up for the controller’s lack of enough frets to make it a chromatic instrument and these settings can be adjust from the controller. There is an up-pick offset that makes the upward movement of the pick bar a different note than the downward movement. The motion control can also be used as an input. He demonstrates pitch bending and cutoff using that method.

This looks like a lot of fun. He needs to team up with [Joran] to add drums to the mix, forming a much more creative rock band than you can buy in the store.

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Last Updated (Sunday, 07 February 2010 15:28)

 

Low-Cost Multi-point Interactive Whiteboards Using the Wiimote

PostDateIconSunday, 03 January 2010 13:42 | PostAuthorIconWritten by KriekOS | E-mail
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In these budget conscious times, schools who want to integrate modern interactive technologies have a choice, buy a SmartBoard , or build your own for a fraction of the cost. Johnny Chung Lee has done some of the groundbreaking work with the Wii, the build instructions and downloads can be found on his site. In addition to the Wiimote, you'll need an infrared light emitting pen, which you can build yourself for short money.

Since the Wiimote can track sources of infrared (IR) light, you can track pens that have an IR led in the tip. By pointing a wiimote at a projection screen or LCD display, you can create very low-cost interactive whiteboards or tablet displays. Since the Wiimote can track upto 4 points, up to 4 pens can be used. It also works great with rear-projected displays.

Rather than spending thousands of dollars per classroom, students and faculty could make them in-house while helping to transform the school into a more technology-rich learning environment. With a project like this in your school, it could be a great way to do some electronics, system design and get a taste of mass production of the components. While this may not fit in to your current curriculum to have students build these systems, it could be a great way to collaborate across subject areas, or it could provide a great after school club activity.

Has your school built one of these $40 smartboards? How well do they work in comparison to other interactive display systems? Let us know about your experiments and experiences in the comments.

source: blog.makezine.com

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Last Updated (Friday, 08 January 2010 08:50)

 
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