A 12V servo has a 12V supply, you still route ground and signal to the Arduino to
control it. In other words the 12V and 5V supplies share a common ground, preferably
at a single common point (such as at the servo).
A 12V servo has a 12V supply, you still route ground and signal to the Arduino to
control it. In other words the 12V and 5V supplies share a common ground, preferably
at a single common point (such as at the servo).