Signal Generator
Tsunami - Arachnid Labs (arachnidlabs)
The Tsunami is a powerful and flexible signal generator built on the Arduino platform. It's the best way to get started experimenting with analog signals, and a great tool for a huge variety of tasks, too. With its highly accurate crystal, you can use the Tsunami to generate signals - sine, triangle, and square waves - all the way from DC up to around 2 megahertz. A versatile analog frontend allows you to adjust amplitude from 0 to 6 volts peak to peak, and DC offset by up to 2 volts either side of ground.