i control the digital camera (Nikon coolpix 4300) with Snappix via serial cable.
my linear laser is powered by USB connector, it only need 3 volts.
my rottating platform will be (hopefully) done this year and will use another com port to control.
I plan to use a simple stepper motor (like in floppy drives 5.25) and control it with uIC.
Why I use so many ports?
So that you can use what you have and not to be locked on mine gadgets.