Hello @Tooki57!
I am very interested in your project. This is another commercial option:
https://www.roj.com/prodotti/mechatronic-systems/pcs-w1/
I am planning a similar project where I will join custom seeder units and an old Nodet mechanical seed hopper on top. Electric motor on the hopper shaft should start/stop when AOG tells to, or when units are off the ground. After running a calibration phase, speed of the hopper shaft is matched with AOG tractor speed to supply correct kg/hectares. I think a motor with shaft-encoder would be most precise.
I have not looked fully into the rate controller of @SK21 yet, it looks complicated for this application.
Simple section control without rate control done by @MTZ8302 seems good and it is well documented: Section Control documentation for ferilizer spreader
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