目录
摘要
................................................................. 3
英文摘要
............................................................. 3
1
引言
.............................................................. 4
1.1
心率计的研究背景和意?/p>
........................................... 4
1.2
心率计的研究现状及发展动?/p>
....................................... 4
2
方案论证及元器件选择
............................................... 5
2.1
研究内容及设计指?/p>
............................................... 5
2.2
方案设计与论?/p>
................................................... 5
2.2.1
传感器的选择与论?/p>
............................................. 5
2.2.2
信号处理方案选择和论?/p>
......................................... 7
2.2.3
单片机系统选择和论?/p>
........................................... 8
2.2.4
显示模块选择和论?/p>
............................................. 9
2.3
元器件选择及其功能介绍
............................................ 9
2.3.1
单片?/p>
AT89S52 .................................................. 9
2.3.2
红外传感?/p>
..................................................... 11
2.3.3
双运算放大器
LM358N ............................................ 11
2.3.4 LCD12864 ...................................................... 12
3
硬件系统设计
...................................................... 13
3.1
系统设计框图
.................................................... 13
3.2
信号采集电路
.................................................... 14
3.3
信号放大电路
.................................................... 15
3.3.1
一级信号放大电?/p>
............................................... 15
3.3.2
电源模块设计
.................................................. 16
3.4
信号比较电路
.................................................... 17
3.5 LCD
显示电路
.................................................... 18
3.6
记忆电路
........................................................ 18
3.7
键盘电路
........................................................ 19
4
软件设计
.......................................................... 19
4.1
测量计算原理
.................................................... 20
4.2
主程序流程图
.................................................... 20