Sunday, November 29, 2009

Circuit Boards


Our group ordered a Peggyboard to be used for emotive lighting on the belly of our robot. The PeggyBoard is a pre fabricated matrix of 625 red, green, blue, and white LED's. However, the board is only about 12" x 12" and the belly area of our bot is easily 10 times that.
Our solution has been to create a series of small pixel boards that will contain a cluster of 4 LED's (red, green, blue, and white). Ethernet wire will then connect our pixel boards to the PeggyBoard. This will allow us to disperse the LED's evenly across our surface, without sacrificing control of every single LED.
A Sheet of 25 pixel circuits


Cutting Test Group of Pixel Circuits

A quick Sketch

A quick sketch on how our drive system will look

A few notes:
  • As decided by the team, our drive system should have multiple points of traction along each axis of motion. This will require the construction of an axle along the length of the hinge, A coupling to attach the axle to the motor, and multiple gear meshes (most likely a pair of 2).
  • Delrin or some other self-lubricating plastic will be ideal for the support structure. The coefficient of friction between stainless steel and Delrin would make more complex ball bearings needless. Maintenance in the long term would also be reduced
  • Gears could be cut on the water-jet.
  • Exposed or hidden Gears? A few weeks ago, this issue came up and the team decided the folllowing: That hidden gears would be ideal, but since an alternative could not be developed, Exposed would be acceptable. Unfortunately not all of our group recalls this conversation. As a result, drive system design has been put on hold until further notice. Some team members would like to ask outside mechanical engineers for a second opinion.
  • I'm really sick of gears ...and welcome someone else to try if they are unhappy with the results.

The Joy of Prototyping (Part 2)


So we've got our actual motors and are proceeding with designs for the drive systems. Damien and I whipped together this quick prototype to show how we might actuate our robot. We scored the finalized dimensions of the frame onto the acrylic so it would be easier for our teammates to visualize how these parts fit together.

I'm very confident that our drive system will be more than adequate to actuate our robot. The motors are rated at over 6,000 oz/inch, which basically translates to us trying to hold the motor in one hand, and squeezing a pair of pliers in the other hand in an attempt to stall it. We were happily unsuccessful-

The Joy of Prototyping


First Attempt Drawing
This hinge is a prototype design for experimenting with gearing and torque. The hinge and motor assemblies will be responsible for actuation of all six planes of our "Creature". Once we can demonstrate a successful test case, We will create a total of Five drive systems that will be self contained and installed into the completed aluminum frame. This prototype is not designed for our motors, rather to test some basic gearing principals and then break it (intentional overload) in an attempt to expose possible design weaknesses.

As you can see, I didnt properly account for the piano hinge and there is a slight gap between the gears.

Back to the drawing board....
Success!



Tuesday, November 24, 2009

Designers vs. world

I'm sure the language barrier illustrated below is familiar to anyone attempting to communicate to someone outside their area of study.

If all else fails, its funny-

Creature Feature (The Thang)

Team 4 (un-named thing)



Graphics Generated by Rachel and Damien

Not Blogging is a good thing-

I find that the more pressure we come under as each week passes by, the less we're blogging. For me, it's simply too difficult to justify the time it might take for me to articulate myself and carefully explain our "master plan" for creating a functioning SmartSurface. So instead, I've been devoting more of my time working to physically manifest the surface we've spent the last several weeks dreaming about.

For the next 17 days (yes, 17 days is all that remains!), I will not be blogging. Instead I will switch to "documenting" mode, relaying photos of our manic process. After all, a picture is worth a thousand words and frankly I just don't have the time to write the thousands of words necessary.

Henceforward I default to photos, with the occasional caption-

Thursday, November 5, 2009

Long Awaited Task 4 Recap


Team Bonding(Finally!)

Objectives

This exercise prompts you to propose, develop, deconstruct and implement an idea based on the principles of an interactive, heliotropic smartsurface. The smartsurface concept should constitute a set of functionalities that otherwise exist in 3-dimensional space, collapsed into an ostensibly 2-dimensional space, thereby gaining additional functionality and/or appeal.
This exercise is intended to get you thinking about the scalability of your ideas and feasibility of their implementation. The brainstorming you do should be more structured, with the objective of developing enough ideas and potential pathways to pursue in the following two weeks. You should produce something that is either a tangible prototype, or a very clear indication (with detailed drawings, diagrams, perhaps computer models) of what you will be building in the ensuing two weeks
You should restrict your work to the tools and approaches covered in class thus far. This exercise values creativity in the face of constraints.

Results
This was the most difficult two weeks of the semester thus far- Our group did not work well together and a great deal of our time was spent resolving "misunderstandings". Nonetheless, in the last 48 hours we pulled ourselves together, set our differences aside and managed to produce a functioning prototype to was quite successful. I was honestly surprised, early on I had doubts that we would be able to produce anything.

The fruits of our labor were made all the sweeter by our difficulties.

The result was the creation of a surface that circulates a fluid to heat or cool an internal environment. Arguably, this has already been done by solar water heaters. Our idea is novel in its execution: To create a changing and dynamic skin, perhaps as an architectural facade, that can react by circulating fluid though a hive-like arrangement of bubbles. One possible scenario is illustrated as:

Pre-Dawn: the facade is in its empty state with the matrix deflated
Daytime: Once the outdoor temperature is greater than that of the building the bubbles are inflated. Throughout the day, the fluid within the bubbles gather thermal energy. The Structure of the bubble-facade lends itself to the added benefit of increasing the surface area exposed to sunlight. In this way each individual bubble within the matrix acts as a mini-solar concentrator.
Nighttime: Once the outside temperature falls below that of hte building, the fluid is removed from the Bubble facade and moved into the building, acting as a "thermal battery", storing heat to be distributed as needed throughout the building.

Alternative: This system could be utilized in multiple ways, including inversely to store the cooler temperatures of the night for use as cooling throughout the day-

Self-Critique: The largest personal qualm I had throughout the entire two weeks was that i felt as though we were taking "the long way around". Meaning, I felt that there was a better solution to the problem we sought to answer. Better, like this blog, is a complete matter of perspective' mine being from the standpoint of simplicity, efficiency, as well as efficacy. I think that our group became fascinated with a mechanism then sought to apply it in a positive way. In this way, we doomed ourselves to creating something that addressed nothing, at least, directly speaking.


Me, assembling the servo-valve controls

Johanna, attaching the fabric to the bubble matrix