目 录
第一章 绪论....................................................................................................................................1
1.1目的和意义.........................................................................................................................1
1.2国内外的发展概况.............................................................................................................1
1.3主要内容.............................................................................................................................2
第二章 数据采集的硬件设计........................................................................................................3
2.1单片机数据采集系统.........................................................................................................3
2.1.1基本组成...................................................................................................................3
2.1.2采集方式...................................................................................................................3
2.1.3硬件组成...................................................................................................................4
第三章 硬件电路设计....................................................................................................................5
3.1水位传感器的选择.............................................................................................................5
3.1.1浮子式水位传感器...................................................................................................5
3.1.2压力式水位传感器...................................................................................................5
3.1.3气泡式水位传感器...................................................................................................6
3.1.4超声波水位传感器...................................................................................................6
3.2传感器检测电路.................................................................................................................8
3.2.1超声波发射电路.......................................................................................................9
3.2.2超声波接收电路.....................................................................................................10
3.3 A/D转换电路设计...........................................................................................................10
3.3.1 A/D转换器工作过程.............................................................................................10
3.3.2 A/D转换单元电路设计.........................................................................................11
3.4单片机最小系统...............................................................................................................13
3.5 LED显示电路..................................................................................................................14
3.6 报警电路..........................................................................................................................16
3.7串行通信电路设计...........................................................................................................16
3.7.1 RS-485通信总线....................................................................................................17
3.7.2串行通信电路设计.................................................................................................18
3.8 电源电路设计..................................................................................................................19
第四章 软件设计..........................................................................................................................20
4.1数据处理程序设计...........................................................................................................20
4.2数据采集处理...................................................................................................................22
4.3数据显示...........................................................................................................................22
4.4报警程序设计...................................................................................................................23
4.5数据通信...........................................................................................................................24
第五章 系统的抗干扰及可靠性设计..........................................................................................25
5.1电磁干扰对系统的干扰...................................................................................................25
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