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目 录
1 引言 ...............................................................................................................................3
1.1 目的和意义.........................................................................................................3
1.2 研究概况及发展趋势.........................................................................................3
1.3 本系统主要研究内容.........................................................................................4
2. 总体方案论证与设计 ..................................................................................................5
2.1 主控模块的选型和论证.....................................................................................5
2.2 显示模块的选型和论证.....................................................................................5
2.3 温度检测模块的选型和论证.............................................................................5
2.4 系统整体设计概述.............................................................................................6
3. 总体方案论证与设计 ..................................................................................................7
3.1 主控模块.............................................................................................................7
3.1.1 STC89C52 单片机主要特性....................................................................7
3.1.2 STC89C52 单片机的中断系统..............................................................10
3.1.3 单片机最小系统设计 ............................................................................10
3.2 LCD 液晶显示器简介......................................................................................10
3.2.1 液晶原理介绍 ........................................................................................10
3.2.2 液晶模块简介.........................................................................................11
3.2.3 液晶显示部分与 STC89C52 的接口.....................................................12
3.3 键盘模块设计...................................................................................................12
3.4 蜂鸣器模块设计...............................................................................................13
3.5 温度检测模块设计...........................................................................................13
3.5.1DS18B20 简介.........................................................................................13
3.5.2 温度传感器工作原理.............................................................................14
3.5.3 DS18B20 相关介绍................................................................................15
3.5.4 DS18B20 使用中的注意事项................................................................16
3.6 加热和冷却模块设计.......................................................................................16
4.系统软件设计 .............................................................................................................17
4.1 主程序...............................................................................................................17
4.2 读出温度子程序...............................................................................................17
4.3 温度转换命令子程序.......................................................................................18
4.4 计算温度子程序...............................................................................................19
4.5 显示数据刷新子程序.......................................................................................19
4.6 1602 的液晶显示..............................................................................................20
4.7 程序设计原理...................................................................................................20
5.系统调试 .....................................................................................................................21
5.1 硬件调试...........................................................................................................21
5.2 软件调试...........................................................................................................21
5.3 调试结果...........................................................................................................21
6.结论 .............................................................................................................................22
附录 ................................................................................................................................24
系统整体原理图 ............................................................................................................24
系统 PCB 图...................................................................................................................24