Adafruit Schrittmotor 200 steps/rev, 12V 350mA with SainSmart L293D Motor Drive

Hello together,

i want to build a camera slider with an Arduinu Uno and these two articles.

But i'm new on this area and have no idea how i can realize that.
What for a external power i need?
What things i have to observe by the exteral power?

Thank you in advance

Julian

It would be better to use a specialized stepper motor driver such as the Pololu A4988 as that will allow the use of a much higher motor supply voltage for better performance. it will also make the programming much simpler.

See these links for more info.
Stepper Motor Basics
Simple Stepper Code

...R