The Access Control System Used In Intelligent Visitor Management

With the development of science and technology and economy,not only does people's activities expanded,but also the contacts between people is becoming more and more closely.At the same time,the visits between large businesses,universities,government and so on is more and more frequent.But there are some confidential departments or units within the protection area that is not allowed to enter any visitors.Therefore,in order to limit the scope of the activities of visitors,protect people's property and life safety,the application of visitor management access control system also arises.This paper analyzes the history and current situation of the domestic and international access control system,and presents an access control system for intelligent visitor management for the communication between the people of the world is becoming more frequent and diverse.This is in the implementation of large enterprises,government,etc...First of all,visitors need to register personal information,the person being interviewed at the gate,and then the administrator sent the visitor a RFID card,which has been checked in.According to the information registered by visitor,the cardholder can only access the door control of the registered and designed building,for the entrance guard of other buildings,the RFID card doesn't work.In addition,as the visitors can only be distributed a card,if visitors want to visit other personnel who is not in the building which the RFID card is registered,they need to register at the door again.This is not only a waste of time,but also not conducive to the corporate image.Therefore,by adding a GSM module,the syetem can realize that the person being interviewed could open the access control themselves by the mobile phone.As a result,you can achieve the function of dual access,including card access and the phone access.Firstly,this paper introduces the basic theoretical knowledge of the access control system used in the intelligent visitor management.It selects LoRa technology to form a radio frequency Network,which belongs to the category of Low Power Wide Aera Network(LPWAN).LoRa technology has the characteristics of low power consumption,ultra long distance transmission,which meets the requirements of power and distance of the system.After determining the network technology suitable for the intelligent visitor access control system,the overall design scheme of access control system for intelligent visitor management is also proposed.It mainly introduces the overall architecture of the system,specific function,and the selection of chips which realizes the main function,etc.The access control system is divided into two layers,the upper is the conrtrol center,the lower is the access terminal.Then,the specific hardware circuit design of the access control terminal is given,and the software driver program of the hardware of the access control system is realized.At last we should debug the hardware and software of the intelligent visitor access control system,analyze the results of the program running and the realization of hardware function.According to the problems in the debugging,we conduct the analysis and study,and gradually solve the problem,optimize the program,finally realize the intelligent access control system for the visitor management.