Google engineers J.J Barrons and Joe Fernandez have developed this lawn irrigation system. Dubbed Irrduino it uses Android, Ardiuno, Python, Dart and the Google App Engine.
The project hardware details can be found on JoesHacks blog. The source code can be downloaded from Google code. The files include an Arduino based controller using an Android ADK board and an Arduino Ethernet Shield; an Android application that can control the Arduino; and a Python, Google App Engine application that can control the Arduino module as well as communicate with the Droid app. There’s also a game written in Dart called Lawnville that is a bit like Farmville, but it results in a real lawn being watered.