This project has to optimize the brightness rate of a place.
A photo-resistor is connected to an Arduino which decides when the parasol has to go up, or go down.
This action depends on the wind and the luminosity : when wind rate is LOW and brightness too HIGH, the motor is launched and the status of the parasol changes.
There is two limit switches sending a HIGH state when pressed.
They stop the progression of the parasol.

Thanks to Lucas and PATT

Code here.