Function (or signal) Generator


you should add a R-2R layer on the Arduino board to use Arduino as a programmable function generator.
See for example :


This sounds like it would be a better fit for either a shield or a portion of a dedicated daughter/application specific board that also had (for example) a reconstruction filter and an output buffer.


ladyada has a blog post here describing a one-chip synthesizer by Linear technologies that puts out 1hz to 68 Mhz…
and it’s SPI too.


Here’s more on signal generators

You are kindly invited to visit my blog ;) which includes a detailed description of a simple and pretty efficient DDS