Design And Implementation Of Building Control System Based On The Cortex-A8 Embedded Platform

Architecture is an important invention of human survival,intelligent building has been promoted after thousands of years of civilization development.With the use of communication,control and computer technology,intelligent building could monitor and manage internal electrical equipment uniformly,also including the collection,analysis and handle of each subsystem.In order to get better energy saving and the improvement of modern management and service,control system using effective control algorithm for mechanical and electrical equipment.In the background of combination of communication and database technology,this paper promotes an embedded system technology to build a building automation system.Based on this platform,it has achieved emote control and monitor of inner lighting,AC system and water supply,drainage system.The system is mainly includes Cortex-A8 embedded terminal and Android operating system.The core controller of hardware part is the DDC controller which is based on the Cortex-A8 embedded platform.System connects to other mechanical and electrical equipment,instrumentation and various sensors through the bus and network cable while sensors collect all kinds of information that system required(Such as temperature,humidity,pressure,etc).DDC sends control instructions to the mechanical and electrical equipment after analysis and judgement.The platform will collect the information classification and storage,while part of the information through the network cable to the background server;The server is primarily responsible for network communication with the Android client and the embedded platform.Also storing the data in the database.The Android APP which is responsible for monitoring and display software,collecting and displaying local data,APP provides a good user interface for the user of building control system.The operator can also control part of the electromechanical equipment through APP to view all kinds of instrument sensor information and manage the overall operation of the building.This paper described in the building automation system design and implementation in four parts,which is hardware,software,background server and system function test use.The system firstly build hardware development platform including the design of power,serial communication,RTC real-time clock,A / D and D / A,USB module,network port communication module and other circuits.Based onthe success of platform test,transplanting the Android operating system.After that,introducing Android system and its transplantation steps in the software design part,detailed description of the application structure level and its development steps will also be provided.Finally,the background server and the development of the database will be briefly introduced.In this paper,after the completion of the system hardware and software design,the overall performance and function of the system were tested.Finally,the research system of this paper is summarized,and the shortcomings are pointed out,and the direction of system improvement and future improvement is put forward.