4 wheels drive (skid steering mode) wiring between Flight controller and driver boards

ArduRover Rover 4.6
1

Hello,

I have a question on what wiring is best to build a 4 wheels ski steering ardurover when using two driver boards (in my specific case : two Cytron MDDS30 boards).

I see indeed two wiring possibilities : are they equivalent or is one better or recommended ?

Common for both wiring :
-CH1 output of the flight controller is emitting the LEFTmotor control signal,
-CH3 output of the flight controller is emitting the RIGHT motor control signal
-A, B are the left motors
-C, D are the right motors

MDDS boards boards have two RC inputs, each controlling two motor ports
So let’s name these RC inputs as follows for the two MDDS30 boards:
-MDDS board 1 : inputs RC-A and RC-B
-MDDS board 2 : inputs RC-C and RC-D

So,

Wiring possibility n°1 :

-MDDS board 1 manages the two left motors : CH1 is connected to RC-A and RC-B
-MDDS board 2 manages the two right motors : CH3 is connected to RC-C and RC-D

Wiring possibility n°2 :

-MDDS board 1 manages the two front motors
-MDDS board 2 manages the two back motors
-CH1 is connected to RC-A and RC-D (A & D being respectively the front Left and front right motors)
-CH2 is connected to RC-B and RC-C (B & C being respectively the back Left and front right motors)

What is the best /recommended wiring ? Or is there no differences ?

2

Technical there is no difference. Maybe the length of wiring could be an argument, mechanical layout.
But as these modules are only normal (brushed) DC motor driver you can connect both motors of one side to the same driver output in parallel dependig of motors power consumption. If this is possible you only need one module at all

3

Ok.
One module is not enough in terms of amps delivered. That is why I need two motor drivers.