This code can be used to depict a small example of Home-Automation that can also be used as a security system.

Here, when there is low light or complete darkness
in the room, and any motion is observed on pir sensor,
Light bulb, connected to a 9V Source battery will 
light up, as it is connected to relay module which is
set to power it up when motion is detected in brightness
level less than 5%.
Also, there is a sound buzzer, which can be used as an 
alarm system in case the user is not in the house, which
can be controlled by a switch.

Case 1: User wants the light to automatically turn on
    as soon as he enters the dark room.
        
Solution: He turns of buzzer switch, so when he enters
      the room, the buzzer sound doesn.t annoy him/her.
          
Case 2: User is not in the house and he don't want any
    person to enter his house.
        
Soultion: He turns on the buzzer switch, so when someone
      enters the room, the buzzer/Alarm system will 
          turn on and inform the neighbours that something 
          is not right. Also, this system can be modified
          to send notification to the user about the 
          intrusion.
        

For the convinience of user, LCD display will show the
current brightness of the room, with number of motions
detected previously.

Improvements: Multiple Photoresistive sensors can be used
        instead of one. That will give more precise
              idea of darkness inside the room.

This project is created by: Anshul Nigam.
CLUB: INNOGEEKS.
College: KIET Group of Institutions, Ghaziabad- 201206.
Semester: 3rd