目 录
摘 要...........................................................................................................................................................I
....................................................................................................................................................................I
ABSTRACT.............................................................................................................................................II
目 录........................................................................................................................................................III
1 引言.........................................................................................................................................................1
2 电热水器控制系统整体设计方案.........................................................................................................1
2.1 电热水器控制系统功能说明.........................................................................................................1
2.2 系统整体设计方案.........................................................................................................................2
3 硬件设计.................................................................................................................................................2
3.1 微控制器模块.................................................................................................................................2
3.2 温度测量.........................................................................................................................................4
3.2.1 Pt1000
铂电阻温度传感器
......................................................................................................4
3.2.2
温度信号放大电路
..................................................................................................................4
3.2.3
模数转换电路
..........................................................................................................................5
3.3 实时时钟.........................................................................................................................................6
3.4 温度、时钟显示电路.....................................................................................................................7
图 7 CH451 引脚图...................................................................................................................................8
CH451 与 LED 连接的显示电路如图 8 所示。.....................................................................................8
....................................................................................................................................................................8
图 8 CH451 与外部电路连接图...............................................................................................................8
3.5 看门狗复位电路..............................................................................................................................9
4 软件设计...............................................................................................................................................10
4.1 整体软件设计...............................................................................................................................10
4.2 模数转换软件设计........................................................................................................................11
5 结论.......................................................................................................................................................12
参考文献..................................................................................................................................................13