以AT89S52单片机为核心油井远程数据采集系统的设计.doc

摘要 石油资源是世界各国的重要资源，它关系到国民经济的正常运行，所以油井的管理和监控成为备受关注的大事。本论文设计了一个油井远程数据的采集的系统。 本系统以AT89S52单片机为核心构建硬件平台，对进行检测。并将传感器输出的电流信号转换为电压信号后经A/D转换器件，由AT89S52进行数据的分析处理。由于AT89S52单片机自身I/O口有限，系统通过扩展片855芯片，实现了采样、键盘设定、显示、报警等功能。在软件的设计上，CAN总线将分布在现场的数据采集模块连接在一起，通过网络进行远程数据采集和控制的功能，实现作业现场环境的远程监控和操纵。 关键词：AT89S52；CAN总线；数据采集系统 Abstract Oil resources are the important resources of all countries in the world, it is related to the normal operation of the national economy, Therefore,wellss management and monitoring are big matter which were concerned. This paper designed of a oil well remote datat system. This system takes the AT89S52 as the core of the hardware platform, to detect the temperature, pressure and flow. And the output signal of sensor into voltage signal after filtering and amplification are sent to A/D converter, for data analysis and processing by AT89S52. Since the AT89S52 I/O Export Co, system by extending a 8255 chip, realizes the functions of sampling, keyboard, display, alarm. In the software design, the use of C language programming, including the main program module, CAN bus interface data communication module, display module, data acquisition module, display module, keyboard module and A/D conversion module design. The design achieved that lower machine gathering temperature signal, pressure signal and the flow of signal on site, data acquisition module will be distributed at the scene through CAN bus are connected together, the remote data acquisition and control through the network functions, realizing on-site environmental remote monitoring and control. Key words：AT89S52；CAN bus；DA 目 录 第1章 绪 论 1 1.1 课题的来源及意义 1 1.2 CAN总线 2 1.3 国内外研究现状 2 1.4 论文研究的内容 3 第2章 方案论证 5 2.1 概述 5 2.2 方案论证 5 2.2.1 控制器模块论证 5 2.2.2 电源模块论证 6 2.2.3 压力采集模块论证 7 2.2.4 流量采集模块论证 7 2.2.5 温度采集模块论证 8 2.3 远程数据采集系统设计方案 8 2.4 系统总体设计方案 9 第3章 硬件设计 11 3.1 AT89S52单片机 11 3.2 复位电路 12 3.3 晶振电路 12 3.4 A/D转换电路 13 3.5 电源电路 15 3.6 报警电路 17 3.7 显示电路 18 3.8 CAN总线接口电路 19 3.9 I/O口扩展电路 20 3.10 滤波电路 21 3.11 放大电路 22 3.12 键盘电路 23 3.1