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毕业论文 基于单片机的多路温度采集系统设计 共49页，19369字
摘要：单片机系统的开发应用给现代工业测控领域带来了一次新的技术革命，自动化、智能化均离不开单片机的应用。单片机是一种集CPU、RAM、ROM、I/O接口和中断系统等部分于一体的器件，只需要外加电源和晶振就可实现对数字信息的处理和控制。单片机由于其微小的体积和极低的成本，广泛的应用于家用电器、工业控制等领域中。
温度控制系统是利用下位机设置温度上下限和实时温度的采集，并将结果传输到上位机。以达到对温度的比较、控制。本设计用MCS-51单片机为主要硬件，设计了包括温度采集，温度显示，系统控制，串口通信等外围电路。而且对所设计电路给出了相应的软件设计，包括定时器初始化，串行口初始化和数据传输等程序。在温度测量部分采用具有“一线总线”接口的数字传感器DS18B20，实现单线多点数据的采集。
多点温度检测与控制系统是典型的集散式控制系统。由下位机、上位机、和通讯网络三部分组成。下位机是基于单片机AT89C52和DS18B20的高精度温度采集系统，功能是对温度的检测与输出控制。上、下位机之间通过RS-232总线构成网络系统。
关键词：MCS-51；DS18B20；温度采集；RS-232
Based on Single Chip Multi-channel Temperature Acquisition System Design
Abstract：The development and application of MCU (Micro Control Unit) have made a great change in many fields of modern industrial detect and control. Adopt Single-Chip Microcomputer is it control convenient, simple, flexibility advantage such as being heavy to have not merely to control to go on to temperature to come, and can raise by technical indicator not to accuse of temperature by a large margin, thus can big improvement quality and the quantity of products. Because of the small scale, low price and high efficiency of MCU, it is widely used in home appliances and industrial control.
The temperature control system is uses in the lower position machine establishment temperature the lower limit, with real-time temperature gathering, transmits to on position machine. By achieves to the temperature comparison, the control，This design uses MCS-51
The monolithic integrated circuit is the main hardware, In order to realize design goal this design including temperature gathering, the temperature demonstrated that, the systems control, strung together periphery electric circuit and so on mouth correspondence. Moreover to design the electric circuit to produce the corresponding software design, including timer initialization, serial procedure and so on mouth initialization and data transmission. The 1-Wire bus digital thermometer DS18B20 is used to measure temperature. It can realize the 1-Wire multi-point collection.
Several points of temperature examination and control system is typically concentrate-disperse system. It consists of up a machine, bottom a machine, and communication network. Bottom a machine is a high accuracy data collection system that bases on the microcontroller AT89C52 and the DS18B20 system. Its function is to temperature and output the control. The up machine and bottom machines constitute of network system, via RS-232 bus.
Key words: MCS-51；Temperature gathering；DS18B20；RS-232
目录
摘要 Ⅰ
Abstract Ⅱ
引言 1
第一章 多路温度采集显示系统的设计要求与设计方案 2
1.1系统设计任务和要求 2
1.2 课题分析 2
1.3 方案比较与方案论证 3
1.4 方案论证和选定 5
第二章 多路温度采集系统硬件的设计 7
2.1 总体分析 7
2.2 AT89C52单片机的性能及应用 7
2.3 DS18B20芯片简介 10
2.4 DS18B20与单片机的典型接口设计 14
2.5 DS18B20使用中注意事项 16
2.6 温度检测系统设计 16
2.7 硬件电路设计 18
第三章 多路温度采集系统的软件设计 20
3.1 程序流程图设计 20
3.2 程序设计 20
3.3 单通道显示 23
3.4 串行通信 24
第四章 系统的抗干扰技术 25
4.1 硬件抗干扰技术 25
4.2 软件抗干扰技术 25
结论 27
致谢 28
参考文献 29
附录1：DS18B20温度测量程序 30