Dave,
Great video! It's a nice one particularly since there's a lot for viewers to try at home (assuming they have appropriate kit).
This is actually the sort of thing that lured me back into the hobby from the software side of things. In software, everything
is so perfect and pristine--i.e, the ones and zeroes don't ring, reflect or otherwise distort. But that's only because some EE
made sure they were that way in the end product. At the bottom, the electronics are entertainingly messy, and there is physics
involved, not just logic.
I suppose it's normal practice when debugging something complicated to try your probing setup against known voltages, etc.
to make sure you are seeing real data and not an artifact of your measuring arrangement?
Anyway,