AT89C52单片机煤矿井下安全监控分站的设计
毕业论文关键词: 安全监控 AT89C52 单片机 RS-485 总线 通信协议
Abstract As a large coal country, China’s coal’s demand is increasing. Theprimary problem of coal mining process is safety. In order to solve thisproblem, the coal mine safety monitoring system must be designed withhigh qualities.In order to make the coal mine safety monitoring system with lowpower and high reliability, this design uses MCS-51 series single-chipAT89C52 micro-controller as the core and RS-485 bus for monitoringsubstation communication. AT89C52 MCU has low power consumption,simple operation and other advantages. The ability of the RS-485 bus’santi common mode interference is very strong, and it’s transmitter candrive a plurality of loads.The design is carried out to build the system framework, anddevelop a system diagram, the selection of equipment and hardwarecircuit designs on the system diagram. The software part and thecommunication circuit begin to be designed after the design of hardwarecircuit. Because mod-bus protocol and RS-485 for matching can ensurethe high stability and high number of communication in the process oftransmission, so communication circuit uses mod-bus as thecommunication protocol. Finally, I use Proteus software to simulate thecircuit design, simulation results show that the underground monitoringsystem’s design can make sure the measure value exceed alarm, andfinish the alarm when avoiding the problem, it has certain feasibility.
Keywords: safety moni toring AT89C52 MCU RS-485 buscommunication protocol
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目录
摘要I
AbstractII
1绪论.1
1.1课题的研究背景及其意义1
1.2国内外的现状与趋势1
1.2.1国内的研究现状.1
1.2.2国外的研究现状.2
1.2.3煤矿监测系统的发展趋势.2
1.3目前系统存在的问题3
1.4本文主要工作4
2系统总体设计方案.5
2.1系统总体结构图5
2.2系统的工作原理5
2.3系统的设计内容6
2.4本章小结6
3元器件的选型与硬件电路的设计.7
3.1单片机的选型7
3.2传感器的选型9
3.2.1模拟量输入输出信号处理电路的设计.9
3.2.2开关量输入输出信号处理电路的设计.11
3.3其它器件的选型13
3.3.1数模转换所用芯片.13
3.3.2通讯收发芯片的选型.15
3.3.3外部数据锁存器的选型.15
3.3.4井下继电器的选型.16
3.3.5蜂鸣器的选型.16
3.3.6矿用防爆电子显示屏的选型.17
3.3.7矿用直流供电电源箱的选型.17
3.4硬件电路的总概述17
3.5单片机辅助电路的设计18
3.6监控信号采集电路的设计18
3.7声光报警电路的设计20
3.8实时数据显示电路的设计21
3.9键盘控制电路的设计22