目 录
摘要....................................................................................................................................I
ABSTRACT......................................................................................................................II
1 绪论 .............................................................................................................................1
1.1 脉搏测量仪介绍 ...............................................................................................1
1.2 脉搏测量仪的应用 ...........................................................................................1
1.3 本设计所要实现的目标 ...................................................................................2
1.4 本文的设计方案:采用以单片机为核心的控制方案 ...................................2
2 主要器件介绍 .............................................................................................................3
2.1 单片机的选择 ...................................................................................................3
2.1.1 AT89S52 简介.........................................................................................3
2.1.2 AT89S52 的特点.....................................................................................3
2.1.3 AT89S52 引脚功能说明.........................................................................4
2.2 传感器的选择 ...................................................................................................6
2.2.1 红外发光二极管简介 .............................................................................7
2.2.2 光敏三极管简介 .....................................................................................7
2.3 驱动芯片的选择 ...............................................................................................8
2.3.1 74LS245 简介 .........................................................................................8
2.3.2 74LS04 简介 ...........................................................................................8
2.4 显示器的选择 ...................................................................................................9
2.4.1 三位共阳八段数码管简介 .....................................................................9
2.4.2 八段数码管字形表 ...............................................................................10
3 系统硬件设计 .............................................................................................................11
3.1 设计原理 .........................................................................................................11
3.2 外围电路 .........................................................................................................11
3.2.1 电源电路 ...............................................................................................11
3.2.2 复位电路 ...............................................................................................12
3.2.3 晶振电路 ...............................................................................................13
3.2.4 脉搏信号采集放大电路 .......................................................................13
3.2.5 LED 显示电路 ......................................................................................14
4 系统软件设计 ...........................................................................................................16
5 软件调试及仿真 .......................................................................................................17