目 录
摘 要 .................................................................I
Abstract .............................................................................................................................II
1 概论.................................................................................................................................1
1.1 课题研究背景及意义............................................................................................1
1.2 国内外研究现状....................................................................................................1
1.3 本文主要工作........................................................................................................2
2 恒温硬件控制设计 ...................................................................................................3
2.1 主控制系统............................................................................................................3
2.2 温度传感器选择....................................................................................................4
2.2.1 温测元件介绍及比较选择..........................................................................4
2.2.2 DS18B20 数字式温度传感器 .....................................................................5
2.3 键盘设置电路........................................................................................................7
2.4 数码管显示............................................................................................................7
2.5 蜂鸣器和 LED 灯 ..................................................................................................8
2.6 硬件部分总结........................................................................................................9
3 控制系统 ....................................................................................................................11
3.1 系统的主程序设计..............................................................................................11
3.2 功能实现模块设计..............................................................................................12
3.2.1 温度传感器 DS18B20 设计 ......................................................................12
3.2.2 中断控制设计............................................................................................14
3.2.3 键盘控制设计............................................................................................15
3.2.4 PID 控制程序设计.....................................................................................16
3.2.5 总的程序流程图及设计............................................................................17
3.3 运算控制模块设计..............................................................................................18
3.3.1 PID 控制算法.............................................................................................18
3.4 软件部分总结......................................................................................................19
