Ellipto: a DIY fitness tracker and dashboard in 70 lines

InternetOfJim writes: This is one of the most fun weekend projects I've done in a while — a fitness tracker for my elliptical trainer. But the real agenda was to figure out how lazy I could be via web services (Keen IO and Brace IO) and development platforms (Electric Imp). Quite lazy, as it turns out. I wound up with a working device and a nice realtime dashboard with no soldering, no backend to manage, and surprisingly little original code needed beyond the sensing and power conserving parts of the firmware and a little javascript to customize the dashboard.