目录
第一章：绪论...............................................................................................................................2
1.1 课题的目的及意义...................................................................................................2
1.2 国内外的研究状况...................................................................................................3
1.3 本课题的研究内容与目标...................................................................................3
第二章：总体设计.....................................................................................................................4
第三章：硬件设计部分...........................................................................................................5
3.1 系统硬件结构及原理..............................................................................................5
3.2 AT89S52 单片机与其扩展....................................................................................6
3.3 传感器的选用 ............................................................................................................7
3.3.1 DS18B20 的特性.........................................................................................7
3.3.2 DS18B20 的结构.........................................................................................8
3.3.3 DS18B20 在温度测量方面的应用....................................................10
3.4 前置放大滤波电路的设计 .................................................................................11
3.5 模数转换电路的设计...........................................................................................12
3.6 复位电路设计 ........................................................................................................13
第四章：软件设计及调试 ...................................................................................................14
4.1 单片机软件设计.....................................................................................................14
4.2 读温度子程序..........................................................................................................15
4.3 温度比较报警子程序..........................................................................................16
4.4 RS-485 串口通信模块程序设计.....................................................................17
第五章：结论与展望 .............................................................................................................18
5.1 主要结论 ...................................................................................................................18
5.2 展望.............................................................................................................................18
致 谢 ..........................................................................................................................................20
参考文献......................................................................................................................................21
附 录 ..........................................................................................................................................23
