Design And Development Of Fingerprint Lock For Smart Campus Dormitory Based On NB-IoT

Student dormitories are the most difficult areas for management on campus with high population density and many hidden safety hazards.With the advancement of smart campus construction,traditional campus dormitory management methods can no longer meet the needs of intelligent management.Therefore,the intelligent upgrade and transformation of traditional campus dormitory management methods which will make the integration of dormitory management into the smart campus management system,is an indispensable part of the construction of a smart campus.The main problems of traditional campus dormitory management methods are: key management problems of mechanical locks and dormitory information management problems.It is understood that most college dormitories still use old mechanical locks.The keys of mechanical locks are not only easy to lose,easy to copy,and there are hidden dangers in reporting the loss,but also unable to carry out effective traceability management for unlocking personnel.Dormitory management is an important task of the logistics department.At present,many logistics departments still use the primitive method of establishing a large number of documents and rely on a large amount of manpower to complete the collection and change of information.Based on the above situation,this subject combines NB-IoT technology,fingerprint recognition technology and embedded technology to design a smart campus dormitory fingerprint lock based on NB-IoT communication technology for smart campus dormitory management scenarios.The specific research content is as follows:(1)According to the needs of campus dormitory intelligent management,combined with the current mainstream Internet of Things technology,a smart campus dormitory fingerprint lock with NB-IoT technology as the core was designed and developed.(2)According to the proposed fingerprint lock scheme,in terms of hardware design,the master MCU and peripheral function circuit modules of the fingerprint lock were selected and the schematic diagram of the hardware circuit was completed.In terms of software design,the communication protocol between the lock terminal and the server terminal was drawn up,and the software driver design of each module such as the NB-IoT module,fingerprint recognition module,and power management module was completed.Finally,test and analyze the overall function and power consumption of the system.(3)An improved remote incremental update scheme based on the BSDiff differential algorithm is proposed.The solution optimizes the firmware management method of the update server,uses the BSDiff differential algorithm to instantly generate a unique incremental update package to reduce the amount of update data that needs to be transmitted,and uses the Div Suf Sort suffix array construction algorithm to improve the BSDiff algorithm to speed up the generation of the incremental update package.According to the results of simulation experiments,the improved incremental update scheme can reduce the time by 31.19% on average when generating incremental update packages.Compared with the full update scheme,using the incremental update scheme can reduce the amount of update data transmission by about 61.17%.