Using the TB6600 stepper motor driver in MobiFlight - MobiFlight/MobiFlight-Connector GitHub Wiki

MobiFlight supports both stepper driver electronics with a separate power supply, and also direct connection of very small (mostly automotive gauge) stepper motors connected directly to the arduino pins. For heavier steppers there are options like the TB6000 controller that on its own end has some flexibility on how it can be connected with differemt types of electronics.

Here is an example of the wiring to connect an Arduino, TB6600 and a Nema 17 Stepper motor:

In MobiFlight, use "EasyDriver" mode for setting up the stepper device pins. This mode is selectable from MobiFlight 9.7 onwards.