Watching the weather nationwide at a glance, see temperatures rise and fall, watch the rain fall, all from a wireless, wall mounted installation.
A node.js script talks to the weather underground API and asks for the temperature and precip status of the 100 latitude/longitude points mapped to the LEDs and sends the spark core a list. The spark then changes the led colors based on the list it receives.
Great work, Dan! Do you know how much the updates have to be slowed down when using a free API key?