The sensor is what connects our otherwise isolated application to the outside world. The sensor will be connected to the GPIO pins of the Raspberry Pi. We can interface with the sensor through various different native libraries, which we will be looking into in the later chapters.

This is the starting point of our data. It is where all the data that is used by our application is created. If you think about it, every other component of our technology stack exists only to manage, manipulate, and display the data collected from the sensor.