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New depth sensors such as the one embedded in the MS Kinect system work in real-time, enabling to create an instant 3D scan of objects. In this project, we are exploring a large-scale installation that demonstrates this by a 400+ array of motors and LEDS. This work includes interaction design, hard-coding and lots of soldering etc. The result will be put on exhibit on various international shows.(Expert: Jouke Verlinden)

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Posted in October 2011

Frame

The past week we’ve been working on a lot of aspects of the frame, firstly we made a more detailed mock-up of the 400 pixels:

 

 

Did some impact tests to see what the worst-case scenario would be:

 

 

Worst case scenario: if everything goes wrong and all the 400 pixels receive power without the control of microchips we are looking at a maximum force of 2 kN. Next step was to take the previously posted frame mockup and run it through some simulations:

 

 
Results above showed some major deflections if the frame was subjected to this loading. This prompted another quick brainstorm session at IO:

 

 

 

 
Idea came up to do something with the frame of an adult swingset, sturdy cheap and actually quite aesthetically pleasing. Below a quick sketch of what we are currently thinking off:
 

 

 

Power supply

Calculations made in conjunction with Rob Luxen has shown us that we’ll be needing at least three computer power supplies. Below are some images of the ones we’ve chosen:

 

 

 

Prototyping of Led diffusers

the cheapest and best way to do this was with thermoforming process. Then
by a lot of trial and error experiments with thickness and types of plastics we
came out with the solution: "vikureen plaat" of 1 mm thickness.

 

 

Here is a 3D concept of the way we want to make and connect  the LD’s:

We make a real study of how the light duffused with this LD:

  http://www.youtube.com/watch?v=5BRJZK-oHfg

 

Now the BIG CHALLENGE is to make 400 LD’s. We will try to do 100 times 4 LD, because the
method to have a non-folded diffuser requires precision and 2 people.

Digital Mock-up

Been working on a digital mock-up of the installation. Trying to get a feel for the size and shape of the display and the frame that will support it.

 

 

Yesterday we made some prototypes of the led diffusers. The diffusers were formed out of plastic sheets by vacuum forming. We made different samples which we varied in height, fillet and draft angle. 

It was hard to release the molds and the sides of the cubes were folded. But the top of the cube, the most important side, looked pretty good. Our next step is playing with the height-dept relation till we get no folds at the side anymore.

 

Program of demands

Finished writing our program of demands this morning. Now onto the design and the bill of materials!

 

 

Program
of demands – Kinetic mirror
Number Item Explanation
1 Dimensions The
mirror consists of 400 linear motor faders ordered in a widescreen format of
16 by 25. Just looking at the pixels this gives us a moving surface of 100
wide by 64 centimeters high. The frame will encompass this surface and place
the screen at eyeheight. The entire display should be able to fit inside the
trunk of a volvo v70 (1.13 by 2) or inside an aircraft cargo container.
2 Force
handling and stability
The
frame has to be strong enough to handle the worst-case scenario: 400 linear
faders that shoot from one end of their 20 cm guide rail to the other with
200 cm/s
3 Mobility Either
the frame can be taken apart and stored in several cases for transport. Or
the frame itself becomes a single storage unit. 
4 Budget The
entire project has a budget of 9800 euro’s. Subtracting from this the cost of
the linear faders and the PCB’s there remains between 800 and a 1000 euro
available for the frame
5 Ease
of build
We
are on a limited timeframe, so the entire construction would have to take
place in 2 weeks. If possible we are going to use as much off the shelf
material as possible
6 Power
usage
Preliminary
estimation of the power requirements for the entire display comes to about
1500 Watt. This will be delivered by computer power supplies.
7 Acces
to individual parts
In
the optimum case it would be possible to change a single broken fader without
disassembling the entire structure. There also has to be easy acces to the
kinect, power supply and pc inside the frame.
8 Interactie Interaction
between the display and passersby is handled by a combination of the xbox 360
Kinect hooked up to software running on a mac mini. The kinect is capable of
processing a 3D environment between 1.2 and 3.5 meters from the device, it
has a horizontal range of 57 and a vertical range of 43 degrees. Interaction
between the passersby and the mirror increases if the distance between the
scanned person and the mirror becomes smaller.
9 Appearance Should
be clean (white) and futuristic. As little should distract from the mirror as
possible.
10 Weight Heavy
enough to stop the vibrations caused by the linear faders, but light enough
to be transported by car or by air transport.

 

AP Project members

Expert:

– Jouke Verlinden  

 

Students: 

– Bas Linssen 

– Jitender Pritipalsingh

– Mauricio Sandoval 

– Nick Noordam 

 

 

 

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