I have just build the hardware from scratch of a 737 compass. I am using a stepper motor ripped from an old printer. All of it linked to an opencockpits usbstepper card. I have tried everything I could read and thought about but it does not work.
The 12 V I am feeding the the card simply do not rach the stepping motor. I guess the problem is coming from either software or wrong device indication.
Anyone have had similar issues? Any help most wellcome.

Best regards,
Jose A Costa