part-specs: drive wheel — verified Hall pinout, gearbox ratio from tooth count, encoder resolution

[IKsares]

Opened #55 with a measured spec sheet for the drive wheel module.

I have an aftermarket Roborock S5 Max-family module on the bench (CDM GM-RS360-16248 motor),
so I opened it up and measured the things that were still open:

• Hall sensor pinout verified experimentally — orange = VCC, brown = GND, blue = OUT.
  Careful: this is not the usual industrial colour convention, brown is not +. This
  confirms the mapping @Scowt had flagged as tentative.
• Gearbox 65.36 : 1 from counted teeth, and the magnetic ring looks like 4 pole pairs,
  not the ~32 poles previously assumed — the two items @OsakaTX listed as needing physical
  access.
• That works out to 0.859 mm per rising edge at the wheel (0.430 mm counting both edges).

One honest caveat: I counted the encoder edges by hand with a multimeter, no scope. That
makes 4 pole pairs a lower bound, and the reconciliation above can't separate it from 8 pole
pairs with both-edge counting. If someone has a scope handy, one shaft revolution on the
blue line settles it — and it halves or confirms the mm-per-edge figure.

Also still open and easy for anyone with the same module: the wheel-drop sensor (markings
MG01-13 / 5P30-M55-W8W, needs nothing but a multimeter), motor currents, and the module
connector model.

[makers-pet]

IKsares - thank you very much, this is really helpful!