1 引言..............................................................................................................................................6
2 方案论证.........................................................................................................................................7
2.1 总体方案..............................................................................................................................7
2.2 温度测控系统结构设计......................................................................................................8
2.3 单片机温度测控系统硬件设计.........................................................................................9
2.4 单片机的选择...................................................................................................................10
2.5 传感器的选择....................................................................................................................11
2.6A/D 转换器的选择..........................................................................................................13
2.7A/D 转换电路模块..........................................................................................................14
3 单元电路的设计...........................................................................................................................15
3.1 单片机扩展部分的设计....................................................................................................15
3.2 信号测量功能模块............................................................................................................16
3.3 信号放大电路模块............................................................................................................18
3.4LED 显示器与键盘电路....................................................................................................20
3.5 上下限控制电路................................................................................................................21
3.6 串行通讯模块....................................................................................................................22
3.7 单片机组成下位机总图....................................................................................................23
4 软件部分设计...............................................................................................................................23
4.1 单片杌部分软件设计总体思想........................................................................................23
4.2PID 控制的算法 .................................................................................................................24
4.3 常规 PID 控制算法 ...........................................................................................................24
4.4 测控系统程序流程图........................................................................................................26
5 结论...............................................................................................................................................30
6 参考文献.......................................................................................................................................30
附录..................................................................................................................................................31