The most complicated thing is not the design, but the programming.
We need a system that can really orient the blades according to the position of the sun and not in relation to a theoretically calculated position of the sun.
It is this system and its programming that drive up the price.
The orientation of the slats according to the climatic conditions (wind, sun, etc.) is optional. There are cranks to orient the blades yourself manually.
Even with the crank, we are indeed in the price orders mentioned by David.
I'm also interested in the project but unfortunately not good enough in DIY.
The system of adjustable slats is not complicated in itself.
Bent-metal or commercial metal blades, tensioning cables connected to the blades to rotate them.
A steel frame for the structure and voila.
For orientation, either manual with a crank, either a theoretical orientation as mentioned above, or a module with light detection but it costs an arm and a leg...
Then as far as bio-climatic is concerned, I don't know much about it... But it's just a question of insulation, trawler transmission etc...
The orientation of the blades is especially interesting when they are closed. Imagine a summer evening a family meal on the terrace with the weather getting rainy. You tilt the slats which when closed form a waterproof cover. No need to pack everything up. How many times has this situation ruined a good evening.
Then the piloting according to the sun personally not useful.
I find the price of 15,000€ quite exorbitant. Ok, the software for the automatic management of the sun's position takes time to be developed, but then it costs nothing. An electronic board with a few components, especially made in large series, even with the amortization of the software study over 3 years is derisory.
They must be making room for themselves on that.
It remains to be seen whether it is the manufacturer, the wholesaler or the dealer who benefits the most.
You forgot to take into account the cost of the advertising brochures that had to be redone to add the term "bio-climatic" in order to stick to the current ecological fashion. :D :D
Indeed, the price does not include this option. The base price is around 600€/m² and it can go up to 900€ to tell you that they are making money.
The term bioclimatic is indeed marketing but still has its meaning because it is about regulating the ambient temperature on the terrace by simply exploiting the air circulation and the protection of the sun.
But we can say that it is almost a pleonasm to say that a pergola is bioclimatic.
In short, it will remain organic if the control remains manual