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目 录
1 设计来源及设计意义.................................................................................................3
2 设计方案.....................................................................................................................3
2.1 总体设计..........................................................................................................3
2.1.1 智能水表的硬件组成部分...................................................................3
2.1.2 智能水表应具有以下功能: ..............................................................3
2.1.3 智能水表实现方式...............................................................................4
2.2 理论基础.........................................................................................................4
2.2.1 AT89S51 单片机................................................................................4
2.2.2 AH44E 霍尔传感器...............................................................................5
2.2.3 1602LCD 液晶显示屏 ..........................................................................6
2.2.4 水流计..................................................................................................7
3 硬件设计....................................................................................................................8
3.1 设计方案.........................................................................................................8
3.2 电路图的设计..................................................................................................9
3.2.1 信号采集电路.......................................................................................9
3.2.2 数据显示电路.....................................................................................10
3.2.3 复位电路.............................................................................................10
3.2.4 报警灯电路........................................................................................11
4 软件设计..................................................................................................................12
4.1 主流程框图....................................................................................................12
4.2 按键扫描子程序框图....................................................................................14
4.3 流水量计数程序框图.................................................................................15
4.4 报警子程序框图............................................................................................15
5 系统调试..................................................................................................................17
6 总结...........................................................................................................................17
致谢..............................................................................................................................17
附录:..........................................................................................................................18
附录一:1602LCD 简介........................................................................................18
附录二:霍尔元件简介及应用...........................................................................22
附录三:按键扫描子程序...................................................................................30