Abstract:Aimed at the increasingly prominent security issues,this paper in view of the present community safety problems existing in the entrance guard system,puts forward an intelligent entrance guard management system based on LoRa spread spectrum modulation technology,the system with LoRa technology as support,on the server side,the cloud,and client,set up star network topology.On the server side,DCTT data monitoring software for data monitoring and management from each user terminals is deployed.On the terminal part, the LoRa module equipped with STM32L051C8T6 CPU is adopted to communicate with the user terminal through RS232 protocol.This method effectively reduces the module’s operating power.On the basis of ensuring the stable operation of the entire access control system,the cloud management and information transparency of the access control system are realized,and the security of the access control system is guaranteed.