To see the visualizations:

Go to https://github.com/kgerst/hack-the-gap-2015
Install node.js (https://nodejs.org/)
Open terminal
Type:
git clone https://github.com/kgerst/hack-the-gap-2015.git
[If error, make sure developer tools are installed]
cd hack-the-gap-2015
sudo npm install -g bower
sudo npm install -g gulp
npm install
bower install
gulp
npm start
[If error, make sure that the Arduino is connected via serial port]
open new browser tab, type in ‘localhost: 3000’ and hit enter