herbschwarz:
No, that will not work. A servo needs a special signal to work correctly.
can I ask, what is that special signal? I thought Arduino can send either digital or analog, and it has to rotate 90 degrees then Arduino is controlling it. If I want 360 after 360 then?
Just get a servo tester if you want to manually drive a servo or ESC. Servo signals
use a particular PWM scheme with pulse widths typically ranging from 1ms to 2ms,
and at a rate of 50Hz or sometimes more.
Using the Servo library on an Arduino is the equivalent of this.
Hobby servos normally have a rotation range of 90 to 180 degrees or so, depending on
the model, this is often not made explicit in the documentation as these devices are not
precision parts, and designed solely for RC model control.
And if your servo is a continous rotation version (sometimes misleading called 360 degree) you have no real chance of getting to turn exactly 360. It has no position control, that's what is taken out to make it continuous. The servo control signal just changes speed and direction.