Author: Pi

Intel DevTech Demo: Fractured Future

     I helped out one of my good friends, Moheeb Zara (the best hacker/maker I know) with some design work for his installation, Fractured Future. The piece comprised of some really lovely LED Infinity Pyramids and were networked with Intel Edisons and the whole thing was stuck together with Octoblu. Here are some pictures of the pyramids (designed by… Read more →

Silver Sound Wave Bracelet

Inspired by the concept of a sound wave, and the beauty of poured silver, I designed a bracelet based on a waveform. First, I uploaded the file that I wanted to see the waveform of. Wavesurfer was a great tool for visualizing the sound. Then, I imported that file and vector traced it in Adobe Illustrator (and I made the thick… Read more →

Optically Clear Electrochromic Film Displays

I came up with an idea for an electrochromic film display (similar to LCD, but big enough to put on windows) and Moheeb Zara has been helping me out with building the device. Below is the latest update from the project (some little 0.8 inch squares) which is a prototype for a demo 5 x 5 (or larger) square with little… Read more →

Ferro Technologies Logo

This is my first time designing for a startup, but I really believe in their mission. This logo and business card was for Ferro Technologies, their website is at Their product is a watch which can be used instead of credit cards with credit card readers. Inductive coils produce the electromagnetic signature, allowing the user to pay at any… Read more →

Fick’s Laws of Diffusion

I’ve realized that Fick’s Laws for diffusion are very important for a lot of different fields, but aren’t very easily searchable. Below is a short compilation of my *favorite* problems and their solutions. Just for fun!   Steady State Diffusion through the Walls of a Cylindrical Pipe (From Jeff Hoyt’s MSE 103 Course at UC Berkeley) Consider hydrogen diffusing through an… Read more →

Material Etching and Etch Rates

Here’s a partial list of materials and their etch rates!     Isotropic Etch Mode Rate (Å/Min) Selectivity (:1) Anisotropic Etch Mode Rate (Å/Min) Selectivity (:1) Silicon Nitrate (Si3N4) SF6/O2 RIE/PE >1000 2-3, Resist CHF2/O2 DRIE 400+ 2-3, Resist >7, SiO2 >10, GaAs >20, GaAs, Al >10, Ti, W, Al 1, Si Silicon Dioxide (SiO2) BHF 100 CHF2/O2 DRIE 300-400 2-3,… Read more →

Introduction to Soft Lithography

This is the second part to my first post about Hard Lithography (Wafer Fabrication). I’m going to just briefly cover soft lithography techniques.   Polymer Materials vs. Glass for BioMEMs Glass has well known surface and electro-osmotic properties for microfluidic applications. Polymers also have some similar properties, such as optical transparency and biocompatibility, but also have a few advantages and disadvantages.… Read more →

“Smart” Polymers and their Stimuli

Smart Polymers are polymers that respond to characteristics of their environment such as pH, temperature, calcium, magnesium, organic solvents, magnetic field, electrical potential, IR radiation and UV radiation. Polymer responses can include altering color or transparency, becoming conductive or permeable to water or changing shape (shape memory polymers).   Below is a table I made of common polymers and their stimuli, based… Read more →

Hog Redesign

When I was taking CS 61a at UC Berkeley (Python, Scheme, and SQL) I had to do a project called Hog. The game of Hog has a few interesting rules (which I detailed below in a handy PDF) but notably the GUI we were provided was much too ugly to go un-redesigned. Here’s my redesigned GUI, with the “before” below.… Read more →