Arduino issues, continued.

The problem was that I was programming the Arduino the same way I would program a computer, even though they are not the same thing. The entire concept of program flow, just to choose one example, is vastly different between the two platforms.

Once I got my head wrapped around that bit of obviousness, the program wrote itself. It works just fine on the prototyping platform; now I just need to build up the hardware and change a few parameters in the software.