Hi Steve, thanks for the great reply.
I think homebrew encoders might be the next step - the mouse idea is something that I'll look into for sure.
You've highlighted many options for creating the analogs and it just goes to show how many different roads there are all leading to the same point.
The next trick for me is finding a way to power my laptop all night long from the middle of an open field.... where's Tesla when we need him??
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