Harish Makaram wrote:
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My doubt is if the target starts b/w the 2 steps there is possibility of an error of abt 1.8 deg for a half stepping.since i would want to have an accuracy of upto a .5 deg.


I hence assume that your motor has 100 steps/revolution ie 3.6 deg per step. If you need an accuracy better then 0.5 degrees you should either look for a stepper with a step smaller than or equal to .5 degrees/step or you could use a reduction gear.

Or you could use something else to measure the angle.

By the way, what will happen if your stepper motor slips (for whatever reason..)... will you notice?

regards
Patrick