> All the emitters go to PIC ground, along with the negative of your wall
> wart. Positive of the wall wart goes to the common(5 wire) or commons(6
> wire) of your stepper. The four collectors each get a stepper lead. Put
> resistors between PIC and base! Let's say 220 ohms.

Another note here, don't try to run the stepper from the supply that feeds
the micro.
Separate supply (common ground) or batteries is easier to get working.