Sine wave library for Arduino. Produces a sine signal and passes the output to a DAC pin.

Features:

• Produces a sine wave using a high sampling frequency.
• Uses a 50 microsecond sample time as the default.
• Uses DAC0 as the default output pin.
• Can produce two tones at once.
• Can produce very low frequencies (below 1 Hz, low enough to blink an led) by increasing the sample time.

A neat thing to try is to connect the sine wave DAC output pin to an ADC input pin to demonstrate data conversion full circle.