Sorry about no updates for ages... But that's because nothing much has happened.
First off, I had difficulties soldering the micro onto the breakout board I'd made, eventually trashing the board (I've no idea about the chip), and I haven't made another board.
Then I had another project that I wanted a good (and true RMS) multimeter for, so I ended out buying one. That kind of removed much incentive for this project.
So I haven't got anything done, and probably won't either... I'll gladly help anyone who wants to take it from where I've left off, and I might have another go at doing the micro and proceed with the experiments on that end. We'll see...