Description
Centauri Carbon 2 Mainboard - 50.204.0305
It is the central processing hub of the machine, responsible for running the operating system, calculating high-speed motion, and coordinating all the sub-PCBs you've mentioned (like the extruder and sensor boards).
Unlike the Marlin-based boards in older Elegoo printers, this is a sophisticated All-in-One Klipper Controller.