keywon's htmstmaa 2009
Keywon Chung, Tangible Media Group
How to Make Something That Makes (Almost) Anything, Spring 2009
Work Summary

Three areas I worked on:

Digital Assembler
Initial Design

With Scott Greenwald and Marcelo Coelho, I conceived the initial funnel + puncher design.

Initial Assembler Design circa 3/17/2009
Part Design Documentation

As we moved away from the Legos and continue with custom designed parts, I also focused on visually documenting the disucssions so that 1) we are all on the same page, and 2) we can communicate the concepts to other people.

Part Design and Size Specs, 4/27/2009
Exploded View of Part Assembly, 5/18/2009
Pick and Place

With the custom parts, I worked on the vacuum pickup scheme, first using the vacuum pen, and then next using a syringe with a vacuum engine.

Vacuum Pen Button Pressing Housing for XYZ Machine, 4/27/2009
Vacuum Engine + Syringe
Testing the Vacuum + Syringe Tip

Modified Syringe Tip, Connected to Vacuum Engine and Mounted on XYZ Machine, 5/4/2009
GIK Assembler

Personally, I was interested in making a GIK assembler using this vacuum pickup and the cam shaft Scott had already made. I also looked at Solder Gun as a way to integrating pressfit with vacuum pickup. I didn't get to make one though.

Conductive + Nonconductive GIK Paths
Solder Gun
Sensing/Feedback aka Evil Bottle
Learning to Fab

Since I hadn't taken HTMAA, I had to first learn the "fab way" of PCBing and programming... First I tried capacitive sensing with hello.step.45. Jonathan Ward guided me throughout, thank you!

Fabbing the hello.step.45 Board and the Programming Cables, Reading the Results
Evil Bottle

Fun Sensing/Feedback exercise: On average Americans are exposed to 300,000 logos and brand impressions a day. Imagine a bottle whose branding and marketing label follows you, as you twist open the bottle...

Evil Bottle: Turning the Bottlecap Triggers The Branding to Follow You
Optical Encoder
Version 1: Disc with Teeth

I started with the hello.light.45 board, but used two optical interruptors/Photomicrosensors (Transmissive) EE-SX1103 instead of the usual phototransistor.

Became messy pretty soon -- needed a bigger board with more traces.

Next, I extended the board to accommodate 2 optical interruptors.

Lasercut Disc Version
Version 2: Greycode for Starbot

For the active elements (aka Starbot) team, I fabbed the optical encoder PCB which was integrated to the bot's main PCB. Worked with Skylar Tibbits, Ara Kranian, Forrest Green, Kenny Cheung, Taro Narahara and David Dalrymple.

Kenny suggested reflective sensors, so I picked a photosensor QRE1113 and designed the Grey Code thanks to Adam Kumpf's help.

Reflective Photosensor Used
Greycode and PCB Layout

Taro and I milled out the PCB, and I tested the collector voltage with lasercut black and white stripes.

Optical Encoder PCB Fab and Test

Ara and I mounted it on a Starbot and tested the signal out...

Optical Encoder PCB Fab and Test

After the test, we up'ed the resistor from 49.9K to 100K and then I soldered total 8 of them.