Taking action after servo has completed move?

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i'm trying have laser fire after servo has pointed @ something.  way know how (since i'm noob), use delay function give servo time move.  there way once servo has completed it's move, can take next action, or have guesstimate delay() function how long servo take?

most hobby servos not provide actual position feedback, although can modified reading internal pot. such, short delay easiest way allow servo position.


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