'Simple' and properly working system for automatic sunscreens

Thanks for showing! My usecase and the approach is very different.

Before there was domotics, in our previous family house, we had a Somfy wind and sun sensor outside and a switch for sun / wind speed / timerdelay inside. For a sun screen of 7 meters long, with 2.5 meters arm length on the south really a good thing to keep it from sailing away!
Now I have two adjacent roller blinds on the east side of an apartment building and I use Suncalc and the lux measurement of a Sensor6. When a certain angle of entrance is passed, the the “down” response comes fairly quickly after we reach a lux value above Lux_Max_Living room. The signal “up” after some time delay when back under Lux_Min_Living room or a “sunset-x” angle. We had some knowledge exchange on this last year @ Slack.

All this shows that there are opportunities here for a sunscreen maker or an app wizard to create a truly versatile solution.