目 录
摘 要 ..................................................................................................................................I
ABSTRACT .....................................................................................................................II
第一章 绪论......................................................................................................................1
1.1 选题概况.............................................................................................................1
1.1.1 课题研究的背景及意义..........................................................................1
1.1.2 国内外的研究状况..................................................................................2
1.1.3 本文的主要研究内容..............................................................................2
第二章 总体方案设计......................................................................................................6
2.1 具体方案选择.....................................................................................................6
2.1.1 传感器......................................................................................................6
2.1.2 A/D 转换器...............................................................................................7
2.1.3 显示器的选择..........................................................................................8
2.1.4 键盘的选择..............................................................................................9
2.1.5 单片机的选择........................................................................................10
2.2 总体方案框架图...............................................................................................10
第三章 硬件电路设计....................................................................................................12
3.1 采集电路的设计与实现...................................................................................12
3.1.1 传感器电路............................................................................................12
3.1.2 放大电路................................................................................................14
3.1.3 A/D 转换电路.........................................................................................15
3.1.4 采集电路................................................................................................17
3.2 显示电路...........................................................................................................18
3.3 键盘模块.........................................................................................................21
3.3.1 矩阵键盘................................................................................................21
3.3.2 矩阵键盘中的键功能............................................................................21
3.4 蜂鸣器模块.....................................................................................................21
3.5 电源电路.........................................................................................................22
