In the following section, we will explain how the security system works and how it will be operated. The hardware connections of the system are as follows:

• The button (works as the doorbell of the system)
• A relay module that controls the lock or unlocks the door
• Connects the web camera that will detect the person that wants to enter the house
• Speakers that will notify the messages about the system
• When the button is pressed, it will request the image taken by the camera
• The Raspberry Pi 3 is connected to the internet by Ethernet interface

The following diagram shows the elements of the system: