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[Reply #15 on:]

That is my mistake, I didn't read the right value the only thing about time is 1 Pulse width<=100ms, Duty ratio : 0.001

[Reply #16 on:]

I tried  signal to cathode and it works much better, now the servo rotates but it can't get into the right position  it moves back and forth between the correct position

[Reply #17 on:]

I got a 4N35 optocoupler and it behaves the same way, it can't get into the right position it moves back and forth between the correct position until it stops

[Reply #18 on:]

could be bad code, bad wiring, bad servo, power supply issues, or other things not provided for evaluation.

[Reply #19 on:]

I tried different servos, optocouplers, wiring is good, power supply is good. Don't know the problem, I am thinking of not using optocouplers.

Has any one used optocouplers to control servos?

[Reply #20 on:]

I am thinking of not using optocouplers.

I think that was suggested a long time back. You need to test your servo without the optocouplers to see if it works.