Constant combinator reading full belt, decider combinator sending an activation signal to an inserter with a filter determined by how much you want to keep. Inserter dumps off the side. It's how my space platform is running right now.
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This is great, and totally works, but I'd like to optimize and somehow get stuff down to a planet rather then chucking over the side.
There are many ways to solve for this problem. For my science platform, I have a priority splitter on iron plates going to science production. Anything that takes the other path goes into cargo and gets sent down.
I couldn't find a vanilla method to limit sending stuff down though, so that can be an issue. For iron, it isn't a problem. I was making far more space science packs than I could consume though and they started building up in my logistics storage. I downloaded Earendel's AAI Signal Transmission mod to allow sending requests to the station. If anyone know a vanilla method to handle this, I'd love to know it, but I couldn't find it. It feels like it should exist.
I think that would require more circuit wizardry than I know how to apply, but the new selector combinator is probably where you want to start. You'll want to try to set a request at the drop platform based on the contents of the space platform.
I thought of a terrible solution. But I don't like it.
On the space platform, depending on what I have too much of, set a predetermined signal on say fish. 1001 equals smelters. On the ground, from a rocket silo, examine the fish request signal, and if I see 1,001, request smelters until the 1001 signal goes away.
Of course, this means maintaining a lookup table numbers to items. I don't like this at all, I will not implement it. But it would work
Use the fish signal, together with a circuit network cpu, to encode and transmit a digital stream of item ids that need to be sent down to the surface... I would go with the inserter over the edge method!
Drop off the edge with an inserter. I feed everything into the hub. Then I have an inserter set to read the hub for each chunk type. If it's greater than 5 it gets thrown overboard. For production it's the same just disable the factory when there is enough. That prevents build ups.
Not from the platform, but you can control what the landing bay on the surface requests with circuit connections.
Do you know of a way to get circuit data from the platform to the planet?
Not at all. I don't even know if the devs have already considered it and decided against releasing it with such functionality.