目 录
第一章 绪论 .............................................................................................................1
1.1 国内外的发展概况 .............................................................................................1
1.2 目的和意义 .........................................................................................................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
