Space Engineers Explained: Easy Vanilla Airlock using a Single Event Controller

Easy airlock setup that only takes a single Event Controller, Doors, and an Air Vent.
SEE BELOW FOR WRITTEN STEPS AND HOW IT WORKS
I will show you the blocks needed, how to setup the event controller, the logic behind the events, and how to operate manually, using a button, or automating with a sensor. I also create a valve between the air tank and the O2/H2 generator so we don't overfill our system. This is a redo with more detail of an older video with, most importantly, better audio!

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Airlock Steps:
Initial State:
Outer door on and open
Inner door closed and off
Airlock vent depressurize on
Event Controller:
Event = Door Finished Open/Close
Selected Blocks = both inner and outer doors
Select Actions:
Toolbar 1, 2nd slot (close) = inner door toggle on/off
Toolbar 2, 2nd slot (close) = outer door toggle on/off
Toolbar 3, 2nd slot (close) = airlock vent depressurize on/off
Airlock Vent:
Setup Actions:
1st slot (pressurized) = open inner door
2nd slot (depressurized) = open outer door
Buttons:
Inside Button = close outer door
Outside Button = close inner door
Sensor (with sensor outside the airlock):
Inside the range = close inner door
Outside the range = close outer door

For all the door controls you can replace the single door with a group of doors or hangar doors to control more complex setups.

How it Works:
The closing of the doors triggers the Event Controller airlock cycle. So initial condition setup is important. One door is closed and off, the other open and on. The vent is either depressurized or pressurized depending on which door is open.

Pressurize (outer door is open and on, inner door closed and off, vent is depressurized)
Closing the outer door manually, by button, or through the sensor triggers the Event Controller.
The EC tells the the inner door to flip to on (so it can open), the outer door to flip to off (so it's locked closed), and the vent to flip from depressurize to pressurize. The vent's 1st action slot opens the inner door when the space is up to pressure.

Depressurize (outer door is closed and off, inner door is open and on, vent is pressurized)
Closing the inner door manually, by button, or through the sensor triggers the Event Controller.
The EC tells the the inner door to flip to off (lock), the outer door to flip to on (to open), and the vent to flip from pressurize to depressurize. The vent's 2nd action slot opens the outer door when the space is fully depressurized

I use the term flip because the controller doesn't know the states, just flips the switch. So setting up your initial state is important. You could go beyond and have 2 event controllers, 1 for pressurize and 1 for depressurize. Then you could explicitly tell the doors to be closed or open and the vent to be either pressurized or depressurized.

0:00 Blocks and Basic Layout
0:18 Initial Conditions
0:35 Event Controller Setup
1:30 Air Vent Setup
1:55 Operating the Airlock
2:53 Sensor Setup
3:57 Automating the O2 Generator
4:52 Connector Valve and Control

Corrections:
0:42 Keen changed the name to *Door Finished Open/Close*. Same function and slots used, just better naming of what it does!
4:05 By 'overfill' I mean the tank gets completely full and the airlock has no where to depressurize the air to. Airlocks need empty space in the tank to operate.