The project that I chose for finish my degree was “Home Security System”. The reason that I chose this project was because I’m very interesting in PLCs and would like to learn about theme. And in this case, about the Home Security is very interesting for me, because is something that involves the common life, and I would be very happy of being able to build a system that can be used in commonness of the day by day. The project basically is based on the simulation of people within its house; that is to say, without truly there is nobody inside the house to be able to carry out common actions that any person could do. Truly they could have manifold common actions that anyone can do in its house, is for that reason that in the present project will solely be carried out three common actions. - Switch ON/OFF the LIGHT. - Switch ON/OFF the RADIO. - OPEN/CLOSE the CURTAINS. With these three actions already it is possible to be simulated that truely there is somebody inside the house, become the home more safe in case that in absence of the inhabitants of the house, because they are on vacations or simply to go the work.