AngeloGomes:
2048 steps for 360 degrees gives 5.688 steps/degree.I would like to have this precision of 1 degree, at least.
Somebody already asked you what accuracy you need. You haven't told them yet.
Somebody else mentioned mentioned 0.2 degree per step, or 0.176 deg per step for 2048 steps over 360 degrees.
Could possibly - look into half-stepping .... maybe.
'Precision' is something like a variance around some kind of averaged angle value (from repeatability measurements - like..... if you measure a something, and you measure and again, and again, and again and again...... you'll get an average...and a spread around that average.... giving some idea about repeatibility). So, at this point, you'll probably need to say what you need... like +/- 0.2 degree maximum uncertainty (relative to the value).