VE3POA published his DIY signal generator control project:
I built a step attenuator, highlighted in 2 previous posts, and quite some time ago I experimented with the AD8307 logarithmic amplifier chip and have a couple of prototype circuits for measuring low power signals sitting around in the junk box. I have the prototype SigGen as well the Arduino board I used for those experiments was still in one piece with the original program. So, why not put all the pieces together and see what happens.
More details on VE3POA’s blog.