In the previous chapter we have used a PIR sensor to sense any human activity, however the problem with the sensor is, that no matter who comes or leaves it would deliver the same message. That basically means that even when you come home after a long day, it would end up asking the same question. Pretty dumb huh? 

So in this chapter we would use the previous repository and integrate the vision and the voice together to make an amazing duo. In this, the camera would identify who is on the gate and would recognize if it is a human and a stranger, if so then, it would deliver the message you intend to give. On the other hand if its you then it would simply let you pass with a simple greeting. However if the face is detected but not recognized then it would give a set of instructions to the person standing in-front of the camera. 

To implement it all you need to do is to set up a camera on the gate of your door along with the PIR. The PIR is basically...