V diplomskem delu je predstavljena registracija delovnega časa z uporabo krmilnika ESP32, preko katerega zaznavamo identifikacijo z MAC naslovom. V uvodnih poglavjih smo se posvetili teoretičnemu delu naloge. Predstavili smo osnovno delovanje sistema, opisali uporabljene platforme ter predstavili različne vrste identifikacije. Nadaljujemo s podrobno predstavitvijo delovanja aplikacije in potekom dela. Predstavljena je tudi povezava in komunikacija krmilnika z mobilno aplikacijo. Na koncu dela sledi diskusija rezultatov in sklep.The diploma thesis presents the registration of working hours using the ESP32 controller, which allows the identification with MAC address to be detected. In the introductory chapters we focused on the theoretical part of the thesis. We presented the basic operation of the system, described the platforms used and presented different types of identification. The following chapters give a detailed presentation of how the application works and how the work was organized and carried out. The connection and communication of the controller with the mobile application is also presented. This is followed by a discussion of the results and a conclusion in the final part of the thesis