Before the lecture, go through the following material:
The Raspberry Pi
This one is a bit of a childish video, but contains some useful information. Feel free to skip it:
Connecting Hardware to the Raspberry Pi
In this video you see how the Raspberry Pi can connect to external electronics. The GPIO pins are the electrical pins which are directly connected to the processor. GPIO stands for general purpose input output. We will use the same breadboard as in the video.
PIR (Passive Infrared) Sensor
The following video contains a good description of a passive infrared sensor, which we will use.
We also have Sense Hat extension boards, which are explained in the following video: