add a Notebook file with some of my thoughts about this project

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+2022.08.25
+- thinking about upgrading one side of the CSM84 to CL series feeders, which
+  operate pneumatically with a valve per lane that needs a FET switch to 
+  activate.  We have 42 mechanical 8mm feeder spaces per side, I'd hope to
+  end up with support for 42 CL feeders, all likely to be used exclusively
+  for 8x2mm 0402 lanes.
+
+- imagine a board with a 64-pin STM32L151 driving 21 dual FETs to operate
+  42 lanes.  processor powered by the USB interface that would be used to
+  interface with the board.  2-pin connector like the ones used on my USB
+  audio boards to bring in DC power for the valves.  low-side FET switches.
+
+- if we posit 2 50 pin headers, putting one on each end of a board and
+  assuming we'd mount the board in the center of the side with 2 pins of
+  each ribbon cable connecting to a valve seems to make sense?
+