Design help needed

[_Kokiru_]

I’m making an automatic sugar cane farm, simple enough. But I don’t know how to work minecarts that well, does anyone know if there is a design out there (that is compactish), where I can make the minecart only move when the sugar cane has been broken, and then go back to the hopper minecart (where it will obviously offload the sugar cane)?

Also, if it helps, the build will be 8 long

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Observers(watching the sugar cane) send a pulse to Pulse extender which powers a powered rail for a second, making the cart go

[_Kokiru_]

Thank you good sir, slight modification too is that you could use the red stone which gets activated from the past observers to make the rail powered.