thanks for the reply,
SO i consider azimuth angle need to be if tracker will move in horizontal axis, elevation / altitude angle for the vertical axis.
any other point need to be considered like Seasonal change ,shadow length during coding while calculations.
DO you know any link which gives information on calculating backtracking algorithms to avoid shadowing,increase efficiency
If i wanna run Nrel code. Which controller is best in arduino. Solar Position Algorithm (SPA)