发布时间：2015-01-21 来源：人大经济论坛

自动化专业论文范文 目 录 摘 要II AbstractIII 目 录V 第一章 绪论1 1.1 引言1 1.2 系统任务1 1.3 系统芯片的选择2 1.3.1 单片机的选择2 1.3.2 温度传感器的选择3 1.3.3 显示器的选择4 1.2 系统性能4 第二章 AT89C51简介5 2.1 AT89C51的主要特征5 2.2 AT89C51的管脚6 2.3 AT89C51的振荡器特性8 2.4 AT89C51的芯片擦除功能8 第三章 温度传感器9 3.1 DS18B20基本知识9 3.2 DS18B20产品的特点9 3.3 DS18B20的内部结构10 3.4 DS18B20的封装及引脚介绍10 3.5 DS18B20的温度计算11 3.5.1 DS18B20的9位存储方式11 3.5.2 DS18B20的12位存储方式11 3.6 DS18B20的工作过程及时序11 3.6.1 初始化12 3.6.2 ROM操作品令12 3.6.3存储器操作指令12 3.6.4 时序13 第四章 硬件电路设计15 4.1 单片机温度采集系统的结构15 4.1.1 单片机最小系统15 4.1.2 温度采集模块16 4.1.3 LCD液晶显示电路16 4.1.4 按键设置16 4.1.5 报警电路16 4.2 硬件电路总体设计17 4.3温度采集模块18 4.3.1 温度传感器特点18 4.3.2 DS18B20使用注意事项18 4.3.3 温度测量领域和优点19 4.3.4 多路温度采集显示的实现19 4.4LCD显示模块20 4.4.1 LCD1602简介20 4.4.2 LCD1602技术参数21 4.4.3 字符的显示22 4.4报警电路24 4.5按键设置25 第五章 软件设计26 5.1 温度采集系统的主程序流程图26 5.2 各模块的程序流程图28 5.2.1 温度采集模块流程图28 5.2.2. 液晶显示模块流程图29 5.2.3. 按键模块流程图29 第六章 系统仿真与调试30 6.1 PROTEUS软件简介30 6.2 PROTEUS的工作过程30 6.2.1 PROTEUS工作界面31 6.2.2 PROTEUS的调试32 6.2.3PROTEUS调试结果33 结 论34 参考文献35 致 谢37 附录138 附录241 摘 要 单片机是指一个集成在一块芯片上的完整计算机系统。尽管他的大部分功能集成在一块小芯片上，但是它具有一个完整计算机所需要的大部分部件：CPU、内存、内部和外部总线系统，目前大部分还会具有外存。同时集成诸如通讯接口、定时器，实时时钟等外围设备。而现在最强大的单片机系统甚至可以将声音、图像、网络、复杂的输入输出系统集成在一块芯片上。自20世纪70年代问世以来，以其极高的性能价格比，受到人们的重视和关注。它体积小、重量轻、抗干扰能力强、环境要求不高、价格低廉、可靠性高、灵活性好、开发较为容易，广泛应用于智能生产和工业自动化上。 本课题通过MCS-51单片机来设计一个温度采集显示系统，采用汇编语言进行编程，可以实现以下一些功能：实时温度以及现场时间的显示，定时报警功能。本次设计的温度采集显示系统由温度采集电路，LCD显示电路，定时报警电路，按键调整电路四部分组成。51单片机通过软件编程，在LCD1602液晶屏上实现XXX℃的显示；利用温度传感器DS18B20来实现温度采集转换的功能；通过两个按键开关，一个用于预设温度的调节，两个用于温度上下限的调节，来实现参数设置和调节功能；当现场温度超过上下限的时候，由蜂鸣器发声，起报警作用。本次设计的温度采集显示系统，所采用的温度传感器精度可达0.0625℃，所以适用于很多场合。本文详细介绍了AT89C51单片机的基本原理，分析了AT89C51各个管脚的功能及它在设计电路中的作用。同时论述了LCD1602液晶屏和温度传感器DS18B20的工作原理及其软件设计过程。 最后，我们还使用PROTEUS软件对本系统进行了仿真调试，以测量系统的可靠性。关键词：单片机 温度采集 DS18B20 PROTEUS 报警 Abstract Single-chip micro-computer is an integrated on a single chip a complete computer system. Even though most of his features in a small chip, but it has a need to complete the majority of computer components: CPU, memory, internal and external bus system, most will have the Core. At the same time, such as integrated communication interfaces, timers, real-time clock and other peripheral equipment. And now the most powerful single-chip microcomputer system can even integrate voice, image, networking, input and output complex system into a single chip. It has been published since the 70's of 20th century and has high performance, so it attracts lots of people’s attention. Its volume is small，the weight is light，the capacity of resisting disturbance is strong，the environmental challenge is not high，the price is not expensive and the development is easy, for that, it is widely used in the intelligent production and the industrial automation. This topic designs a temperature acquisition system through the MCS-51 single-chip microcomputer and the assembly language is adopted in this design. The electronic clock can achieve these functions: real-time and on-site time temperature display, time alarm functions. The design shows the temperature acquisition system by the temperature acquisition circuit, LCD display circuit, timing alarm circuit, four-button adjustment of circuit components. 51 single-chip software programming, in the realization of the LCD1602 display XXX ℃; the use of temperature sensor DS18B20 to achieve the function of conversion temperature acquisition; through two button switches, one for the pre-set temperature regulation。The two upper and lower limits for temperature regulation, to achieve the parameter setting and regulatory function; when the temperature exceeds the upper and lower limits at the scene of the time, the buzzer sends out the sound which can react the effect of alarm. The design shows the temperature acquisition system, the precision temperature sensors up to 0.0625 ℃, so for a number of occasions. This paper introduces in detail the basic principles of SCM AT89C51, AT89C51 analyzed the function of each pin and its role in the design of the circuit. This article also discourses the working principles of the LCD1602 and Temperature Sensor DS18B20, we can understand their software design procedure from this passage. Finally, we also use the PROTEUS software to simulate the system to measure the reliability of the system. Key words：single-chip Microcomputer；Temperature Acquisition；DS18B20； PROTEUS; Alarm