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Smart Airlock!

Fully automated smart airlock (5C) with no extra buttons or overrides and is basically identical to the default manual airlock but opens/closes after filling/draining water that equalises pressure automatically based on when you first click the doors. So there's manual controls at all times on the 2nd click if you want to skip through. The doors do not lock if any of the doors or pump breaks so no override is needed. The airlock exit automatically closes when no player is nearby for convenience and allows you to increase the sub descent speed by closing the airlock entrance door. Ensure to adjust the motion detector range and connect power to the pump.

The circuit design unfortunately has a caveat of the auto closing airlock exit feature not working if you bypass the filling cycle on the 2nd door click. It works fine if you wait for it to auto open after water is filled. Optionally, unwire the left signal check's SET_OUTPUT to disable the feature.