| Door Timer
Door Timers open and close doors at specific times in your regime. They are useful for automating certain doors (e.g. opening canteen doors during meal times).
They must first be connected to specific Door Servos in the utilities menu. Following the connection, you must click the Door Timer to bring up the schedule.
Since the door timer requires power to operate, you can use it to convert power flow in a cable, to a signal in a wire. Set the timer to always output a high signal (set it to "open" at every hour in the interface) and connect it to a status light. In case of a blackout, the door timer will stop working and the status light will turn off. The status light is needed because a door timer without power will not count as a signal output.
The Door Timer can be used in other complex automated systems as well, such as airlocks.