Arduinos and Cake V

The new bits are all happily blinking away, waiting to be turned into all manner of inventions. What will we build this time?

Usual rules - bring an Arduino or a Cake (preferably the latter actually, as we now have at least half a dozen spare Arduinos. Arduini? Arduinae?). No expertise required, if you've never done anything like it we'll have you making strange flashing bleeping machines in no time. Those with more expertise can help with any of the projects we've got suggested thus far up at http://wiki.makespace.org/Arduino_and_Cake#Projects or just come along and play with the contents of the Big Box(es) of Breakout Boards and Bits (see http://wiki.makespace.org/Arduino_and_Cake/Big_Box)

Let's make this one extra noisy :)