
(click for larger image)
The red arrows indicate the contact points. What happens when the button is pressed, is that a contact is made and the door opens. What we want to achieve is simulate that the button has been pressed by creating the contact ourselves (no, not by creating a robot with wi-fi that presses the button on command, there is an easier way ;-)). We can do this simply by the means of a transistor and it would look like this:

This diagram is made with KTechlab (linux users), by the way. If you're a Windows user and want to simulate a circuit, try getting your hands on a student license for Multisim if your university offers this. You can also download a trial.
Come to think of it, I wasn't entirely accurate about the "simply" part. It was possible in my situation to use a (NPN) transistor, but I had to account for the following:

But, if I send a direct current (DC) in the right direction, the door opens anyway. Lucky me! I found this out while doing measurements with the "Diode and buzzer" setting on my multimeter. What this setting does is, that it allows a DC to pass, and when it does, the buzzer sounds to indicate that the two points are connected. (If this doesn't work for you, you need a relay instead of a transistor, which allows for AC to flow. Mirror in case of failure.) So when putting the transistor in place, I have to take notice that the DC that activates the door switch is allowed to pass.
Later on, we will see that interfacing this IC to a computer, will need some precautions that are not yet shown here.
If you want to learn more about transistors, Wikipedia is always a good place to start and Google (click for search results on "Transistor") is your best friend.
I set up a webpage about the 2n3904 transistor if anyone is interested.
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