now,
i think, had success with visualizing a bargraph by arduino nano..
and the logic for checking sections is the same as is for the one-track barrier
i'm building at this time in H0 (Gauge 1:87) also controlled by ardiuno nano.
but learning is a long process..so for using ardiuno nano..perhaps for some
projects a different type of A. may be the better solution..as time goes by
thank you all so far.. 