摘要本课题是人体脉搏测量仪的设计。由于脉搏信号的特殊性，在设计时必须要注意实现测量的准确。它是用来测量频率较低的小信号（传感器输出电压一般为几个毫伏），把脉搏信号转换为电信号，在单位时间内进行记数，并用数字显示其记数值，从而直接得到每分钟的脉搏数。本系统以89C52单片机作为中心，通过使用单片机来实现系统最核心的计算脉搏功能。在信号的前端处理上，使用压电陶瓷片采集人体脉搏信号，然后经过LM358放大和整形，将脉搏信号输入到单片机内，并利用单片机对其进行计数。计数结果将最终送至液晶屏1602来进行显示。虽然压电陶瓷片的性能并非很好，在信号的采集上不能实现非常精确的采集，但是它的价格低廉，并且在经过系统的信号调理电路后，也能比较满意的实现我们所要实现的目标。整个系统耗电低，体积小，具有便携性与精确性。经过多次调试和实验，本系统基本实现了设计所要求的指标。64176

毕业论文关键词  脉搏测量 压电陶瓷片 液晶显示屏 单片机

毕业设计说明书（论文）外文摘要

Title  Design of the Pulse Measurements Based on  Single-chip Microcomputer                     

Abstract This topic is a design of body pulse measuring instrument. Because of the specificity of the pulse signal, the design must pay attention to achieve an accurate measurement.The whole system is center on single-chip microcomputer 89C52,using the signle-chip to achieve the system core function of counting pulse.In the front-end of the signal, we use piezoelectric ceramics to collect the signal of the human body pulse.And then,after after amplification of the LM358,the signal will be converted to the pulse signal with the same frequency,and this signal will be input to the single-ship.The single-ship will count to this.The final result of the count will display in the 1602 LCD screen.Although the performance of the piezoelectric ceramics is not very good,in the signal collection,it can’t do it very precise.But its price is very low,and after the signal conditioning circuit of the system,the signal can be quite satisfactory to achieve our objectives.The entire system works with low power consumption,small size,with the portability and accuracy.After repeated testing and experiments,this system can achieve the basic requirements of this design.

Keywords:Pulse measurement  piezoelectric ceramics  LCD  single-ship  

1   引言 1

1.1   设计背景及意义 1

1.2   国内外发展现状与前景 1

1.3   设计的任务及要求 2

2   系统总体设计 3

2.1   确定方案 3

2.2   总体设计框图 3

3   系统硬件设计 4

3.1   脉搏信号的采集 4

3.2   信号调理单元 7

3.3   信号整形单元 9

3.4   单片机单元 10

3.5   显示单元 15

4   系统软件设计 18

4.1   系统总流程图 18

4.2   中断程序流程图 19