Operating an airlock

A lever in the chamber is fine to start with. But whoever stands outside cannot reach it, and whoever waits in the base cannot see whether the airlock is busy. A good airlock has buttons on both sides, a display and an announcement.

Buttons inside and outside#

Each button calls the airlock to its own side:

Whoever wants to go out calls the airlock with “Innen”, steps in and presses “Aussen” in the chamber. A batch with Average reads buttons with the same name together: if one is pressed, the value is greater than 0.

A button reports Activate 1 while it is held. For the direction only the new press counts, the edge from 0 upwards:

lbn inner BUTTON HASH("Innen") Activate Average
slt tmp oldInner inner       # 1 = just pressed
select dir tmp 0 dir
move oldInner inner          # for the next tick

Without an edge the one who presses longer wins: if someone outside holds “Aussen”, “Innen” would never get through. With an edge the latest new press wins.

The panel writes the direction into a logic memory “Richtung”. The chip that drives doors and vent reads it just like the lever before – the define then says StructureLogicMemory instead of StructureLogicSwitch. That way you spread the work over two chips, and neither hits the 4096 characters.

Status lights#

Wall lights and flashing lights only know On – no colour and no dimming. Colour is available on the LED display through Color:

select colour ready Color.Green Color.Yellow
select colour ok colour Color.Red
sbn DISPLAY HASH("Status") Color colour

Green: the airlock is ready on the chosen side. Yellow: it is changing over, please wait. Red: the sensor is missing. The flashing light “Warnlicht” runs as long as it is not green.

Announcements with sound#

The speaker (StructureKlaxon) picks its sound through SoundAlert – that is the same number as Mode. On 1 plays, On 0 is silent. The game has announcements made for airlocks:

select sound dir Sound.Depressurising Sound.Pressurising
lbn tmp HORN HASH("Ansage") SoundAlert Average
beq tmp sound same_sound
sbn HORN HASH("Ansage") SoundAlert sound
same_sound:
sbn HORN HASH("Ansage") On warn

The chip only writes the sound when it changes: every write of SoundAlert triggers the sound again, even with the same value.

At a number position a name needs its namespace: Sound.Depressurising, Color.Green. The bare name alone is not a number there.