One of the basic functionalities of a smart home is to turn on the lights for you whenever you are around. It is one of the most basic things that any system can do for you. We will start off by turning on the light as soon as you come inside the room, thereafter, we will make the system more and more intelligent.

So, the first thing we need to do is recognize whether you are in a room or not. There are multiple ways to do that. One important characteristic of life is the presence of movement. You may say plants don't move, well they do; they grow, don't they? So detecting movement can be a key step in detecting whether someone is there or not!

This step will not be so difficult for you, as we have already interfaced this sensor previously. We are talking about the good old PIR sensor. So the sensor will sense any movement in the area. If there is any movement, then Jarvis will switch on the lights. I am sure this is something you can do by yourself by now. You can...