Design Of Access Card Reader And Controller Based On Mobile Bluetooth And CAN Bus

The access control system is a kind of security systems of Intelligent System.As a new modern safety management system,the system involves automatic identification and modern safety measures,including electronics,machinery,optics,computer technique,communication technique,biology technique and other new technologies.As a symbol of modern intelligent buildings,there are three common types of current access system :password access control systems,non-contact IC card(IC card sensors)access control systems,fingerprint biometrics access control systems.By comparison these access control systems,we find that the first type of system has been eliminated through selection,because the password is easily given out and the safety coefficient is very low.The Biometric Access Control System has a good safety,but a high cost.Due to there no good solution to some bottlenecks as recognition rate and storage capacity,coupled with high costs,it has got a low market approval.Along with the development of intelligent building and the strengthen of defensive work for intelligent uptown,this paper intends to use Bluetooth technology,STC89C52 RC microprocessor,CAN bus,KEIL-C51 and other technical means to design a high security coefficient of a set of intelligent access control system.The major working contents are as follows:1)In the aspect of hardware design,by using user's mobile phone bluetooth as the identification card,STC company's STC 89C52 RC microcontroller as the main controller,based on both of the access control system in the card reader controller design.First of all,because each bluetooth equipment factory is a curable with a global unique 48 digit BD-ADDR code,it is a public address code,CAN be used for query by technical means.Secondly,the system CAN implement the CAN bus data communications through the use of the company PHILIPS SJA1000 CAN controller and achieve the network function to manage various kinds of information and enhance the security of the whole system.2)In the aspect of software design,the system uses the modular design methods to program design and debug of the main function modules and related auxiliary devices function modules with KEIL C51 SCM software development system.The main function modules include CAN communication modules,memory modules,supporting devices function modules which containing the clock modules,keyboard modules,voice modules,etc.Finally,the system CAN write monitoring proceduresand achieve the variousmodules of the scheduling process according to the functional module priority.3)After the completion of related hardware and software design,we debug the functional prototype for whole and unit,which has verified the functionality and correctness of this design work.Figure [44] table [5] reference [58]...