Software Engineer and Graphic Designer based in Arlington, Virginia.
Raspberry PID: Building a Real-Time Metro Arrival Board with Raspberry Pi and LEDs Raspberry PID: Building a Real-Time Metro Arrival Board with Raspberry Pi and LEDs by John B. Hall June 18, 2015 When I'm leaving my apartment to ride the Metro, I often wish I could quickly know whether there's an incoming train worth hurrying to catch. I could pull up one of the DC Metro apps and look up my stop,…
Creating a Normal Star in Adobe Illustrator, American Flag Style
RailsConf5k Recap: Organizing a Successful 5k Race
An explanation of the CSS animation on Apple's iPhone 4S webpage -- John B. Hall An explanation of the CSS animation on Apple's iPhone 4S webpage October 25, 2011 The "phone stage" (blue-bordered box) contains all 6 "slides" of the animation sequence and has a transition css property with a duration and timing function (a cubic bezier curve). For the phone stage to cycle from one slide to the…