Hardware Prototyping

Cycle Atlanta: Seeing Like a Bike

The Cycle Atlanta project aims at creating sensor systems that allow a bike to "see" its environment and collect data as a participatory effort so that we can help the City of Atlanta to make informed decisions about biking infrastructures. Specifically, a sensor box equipped with sonars, lidars, PM sensors, gas sensors, gyroscope, accelerometer, and others was developed to detect environmental factors that can give rise to bicyclers' stress level. I participated in this project as a Data Science for Social Good (Atlanta's DSSG) Summer fellow in 2017.

Wireless Price Display System

This project was my final team project for "Electrical Engineering Laboratory 3" class in 2004 (when I was junior in college). The goal was to make a wireless system that substitutes price tags with electrical displays in grocery stores. The base station manages a list of products in the database, and it sends out price information to receiver units. Receiver units are simple character displays having unique IDs. When any products' prices change, the system can easily update new prices on these displays. 

Human-Robot Interaction via Sound

This prototype was an intermediate result of a robot-human interaction project conducted at Torooc Inc., a start-up company where I was a co-founder and Director of Software Development, in 2011. I first designed microphone amplifier circuits using transistors and amplifier chips, respectively. Then, I connected 3 microphones to Texas Instruments' Stellais LM4F embedded board. On top of that, I implemented a Time-Difference of Arrival (TDOA) algorithm in C language.