Light curve analysis of XX Cygni from data taken using DSLR

XX Cygni belongs to the SX Phoenicis class of short period variable stars. The pourpose of this paper is to analize data taken by the authors with a common Digital Single Lens Reflex (DSLR) and try to understand the capability of this type of camera in photometric measurements. From data taken during summertime and from the AAVSO International Database, we try to determine the behaviour of the main period of the star and research for other important frequency component by periodigram and Observed-Calculated (O-C) diagram.