The main purpose of the electronic security systems is to identify the possible threats of intrusion and/or fire, in order to start the pre-defined protocols and avoid or minimize the potential consequences. On one hand, this project includes a selection of various security systems we can find in the market, a reference guide for people who are interested in this topic. To apply this knowledge I make a proposal based in a real case and close for us: Castelldefels School of Telecommunications and Aerospace Engineering Moreover, taking advantage of the university has an old security system installed I compare it with the proposed solution.