Slooow movement with RC servo

Other Hardware General Electronics
1

Greets! I'm building a ships-heading indicator for the battleship NJ museum ship. To turn the ships heading synchro, I'll tie a continuous-rotation RC servo to it. I'm using VarSpeedServo as my driver, and would like to get VERY slow rotation. This driver uses an integer as the speed angle variable, and I'd like to be able to control things in with fractional steps - 72.1, 72.5... and so on.

Is it even possible to have such fine control on a servo? If so - i'd have to make a custom version of the driver library to accept floats as the rotation angle/speed.

To do a full 180 turn, at 30 kts, the New Jersey would take 85 seconds. I may not run it THAT slow (visitors would quickly get bored!), but do need to move it quite slowly.

Are there any other servo libraries that give this sort of fractional control? :o

2

Hi, A stepper motor would be better. Any slow speed you want...

See THESE

3

A "continuous rotation servo", so called, is not a servo, its a DC motor with a controller.

A servo mechanism requires feedback, and the feedback circuit is what's ripped out from a servo to
make a "continuous rotation servo".

Model yacht servos are available which do position control over a couple of full rotations (used for
controlling sail winches). That's closer to what you want, but that stepper is good too, assuming
the mechanical load isn't too high.