Becky Stern is up to some really cool stuff over at Adafruit. This GPS Dog Collar (as shown on her adorable dog, Olive) uses a a GPS sensor, OLED display, and Adafruit’s Atmega32u4 Breakout Board to track your pet’s progress towards a goal distance. Everything you need to know to make your own is beautifully organized in their new tutorial site, the Adafruit Learning System, which I really dig. Nice work on all fronts!
GPS-Based Puppy Pedometer