The large circular room is split into multiple cells contains various equipment. In the center on the room, the eponymous ring is a conveyor controlled by Pressure plates. In the back of the room, a Blue door controlled by three Receivers block the passage to the Progress Wheel.
Hints
Solution
[ solution ]
Take the Connector near the Fan and place it on the conveyor.
Rotate the ring until the Connector reaches the section on the right.
Rotate the conveyor counterclockwise until the first Inverter reaches the left section. Connect it to the Emitter and place it down next to the Purple barrier.
Rotate the conveyor counterclockwise until the rest of the tools reach the left section. Take the Connector, link the blue Inverter to the blue Receiver by the Progress Wheel and place it down on the inside of the conveyor.
Take the second Inverter, connect it to the blue Connector and to the red Receiver by the Progress Wheel. Place it down on the outside of the conveyor, one segment to the left of the connector.
Take the RGB converter, connect it to the blue Connector, to the red Inverter and to the green Receiver by the Progress Wheel. Place it down on the insde of the conveyor, one segment to the left of the inverter.
Rotate the conveyor clockwise until all three tools line up with their respective opening in the grate, causing the Blue door to open.