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The radio frequency identification technique has been known since decades ago, however due to some important advances in technology, the amount of micro devices built-in on a chip and the cost of manufacturing, this technology has been implemented in many applications nowadays. A radio frequency identification system used to security check in a University is presented in this work. In this system several autonomous embedded sub-systems are included, which are placed at different entrances at school. Every embedded sub-system has a link up to a master control that registers every event at the entrance. This master control has the command to close or open any entry at any time if a case of emergency is occurred.A detailed analysis about the elements that are included in this autonomous access control is presented. Some important aspects of this system are also presented. Conclusions and perspectives are presented at the end of this work.