摘 要
脉搏心率测量仪在我们的日常生活中已经得到了非常广泛的应用。为了提高脉搏心率测量仪的简便性和精确度，本课题设计了一种基于52单片机的脉搏心率测量仪。系统以STC89C52单片机为核心，以红外反射式传感器ST188为检测原件，并利用单片机系统内部定时器来计算时间，由红外反射式传感器ST188感应产生脉冲，单片机通过对脉冲累加得到脉搏心率跳动次数，时间由定时器定时而得。系统运行中能显示脉搏心率次数和时间，系统停止运行时，能够显示总的脉搏心率次数和时间。经测试，系统工作正常，达到设计要求。 关键词：脉搏心率测量仪；STC89C52单片机；红外反射式传感器
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Abstract
Pulse meter in our daily life have got the very extensive application.In order to improve the simplicity and accuracy of the apparatus used to measure the pulse, this topic has designed a pulse measuring instrument based on 52 microcontroller.System with STC89C52 single-chip microcomputer as the core, with original ST188 infrared reflection type sensor for the detection, and use the single chip microcomputer system internal timer to measure time, pulse generated by the reflecting type of infrared sensor ST188 induction, microcontroller pulse is obtained by the pulse accumulation number, time by the timer timing.System can display the pulse frequency and time, the system stops running, can display the total pulse frequency and time.After the test, the system works well, to meet the design requirements. Keywords：
The
pulse
measuring
instrument;STC89C52
single-chip
microcomputer;The infrared reflection type sensor
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目 录
摘 要............................................................... I Abstract........................................................... II 第1章 概述......................................................... 1
1.1 选题的背景和意义 ............................................ 1 1.2 脉搏心率测量仪的发展与应用 .................................. 2 第2章 脉搏心率测量仪系统结构....................................... 4
2.1 光电脉搏心率测量仪的结构 .................................... 4 2.2工作原理..................................................... 5 2.3光电脉搏心率测量仪的特点..................................... 5 第3章 硬件系统..................................................... 7
3.1 控制器 ...................................................... 7
3.1.1 STC89C52 简介.......................................... 7 3.1.2 STC89C52 的特点........................................ 7 3.1.3 STC89C52 的结构........................................ 8 3.2脉搏心率信号采集............................................ 10
3.2.1光电传感器的原理 ...................................... 11 3.2.2光电传感器的结构 ...................................... 11 3.2.3 光电传感器检测原理.................................... 12 3.2.4信号采集电路 .......................................... 12 3.3信号放大.................................................... 13
3.3.1放大器的介绍 .......................................... 13 3.3.2 放大电路.............................................. 14 3.4 波形整形电路 ............................................... 15 3.5单片机处理电路.............................................. 17 3.6 显示电路 ................................................... 17
3.6.1 LCD1602 的综述........................................ 19 3.6.2 LCD1602 的结构........................................ 19 3.6.3 LCD1602指令集 ........................................ 19 3.6.4 脉搏心率测量仪电路原理图.............................. 21
第4章 软件系统.................................................... 24
4.1 主程序流程： ............................................... 24 4.2 定时器中断程序流程： ....................................... 24 4.3 INT中断程序流程：.......................................... 25
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4.4 显示程序流程： ............................................. 26 4.5 软件说明 ................................................... 27 第五章 抗干扰措施及使用方法........................................ 27
5.1抗干扰措施.................................................. 27
5.1.1环境光对脉搏心率传感器测量的影响 ...................... 27 5.1.2电磁干扰对脉搏心率传感器的影响 ........................ 28 5.1.3 测量过程中运动噪声的影响.............................. 28 5.2测量仪使用方法.............................................. 28 第6章 系统调试.................................................... 30
6.1 系统调试 ................................................... 30 6.2 系统检验 ................................................... 31 6.3 误差分析 ................................................... 32 第七章 总结与展望.................................................. 34 参考文献........................................................... 36 附 录............................................................ 38 致 谢............................................................ 44
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