[Kyle] plans on a follow up tutorial to cover timer based interrupts, which can come in handy when generating frequencies and stuff. Looking for more Arduino Basics? How about Basic on an Arduino.

Also, this module focuses on how to time events using Arduino’s built-in function millis (). It is designed to be used with a pre-built ramp that can be provided if used in a classroom environment.

Droplet and StackAR, developed by MIT’s Media Lab, allow users to set timers or program an Arduino using light-based communication. By pressing the tool against a screen, flashes of light can ...