Haha, I remember that drawing. Someone stressed the importance of labeling your signals and you took it to the next level…
There is no need to use dashed lines with a label repeatedly repeated along its length.
Otherwise, your diagram gives us something to work with.
Solid unlabeled lines between clearly labeled points woukd be easier on the eyes.
Part of the diagram is off the screen, and I think you’ve to,d us the C cells aren’t in your diagram but are attached to the motor shield - not sure what’s going on/represented by the block furthest on the left.
How much current will the motors draw when full on? How does the C cell battery stack do with that load? Do you have a meter you can use to spcheck voltages and currents?
a7