基于单片机AT89C51的电子血压计的设计

毕业设计(论文)

基于单片机AT89C51的电子血压计的设计

姓名陈元邦

学号***********

专业班级通信08C

所在学院电子信息学院

指导教师（职称）王桓（讲师）

完成时间2012年4月

电子科技大学中山学院教务处制发

电子科技大学中山学院毕业设计（论文）任务书

电子科技大学中山学院毕业设计（论文）成绩评定表

基于单片机AT89C51电子血压计的设计

摘要

随着现代科技的快速发展，所带来的就是高强度、高压力的生活；而随着物质生活水平的提高以及城市老龄化比例的增长，医疗电子器件的家庭化逐渐成为了一种趋势,其中家用电子血压计就是典型的家庭医疗检测设备之一。血压作为人体重要的生命参数，对其精确测量具有重要意义，特别是在临床医学和人体保健工作中十分重要。

目前,血压计大致上可分为两种：第一种是汞柱式血压计，其优点为数值稳定，其缺点为肉眼观察误差极大，主观性强，而且体积较大不易携带，必须在专业人员操作下进行；第二种是电子式血压计，其优点为使用简易，操作简单，测量值便于记录，体积轻巧便于携带。电子式血压计确实具备了诸多优点，越来越受到大众家庭的欢迎。

本文设计的电子血压计是采用示波法测量原理，以AT89C51单片机为控制核心，辅以US9111-006-D型压力传感器与MCU之间模拟信号处理，通过ADC0808转换器完成数字信号转换以及液晶显示、报警、自动关机等电路来实现家用电子血压计的设计。在本次设计中，通过对模拟脉搏波的输入进行放大，通过AD转换器来进行模拟信号到数字信号的转换，最后通过单片机进行处理，来完成显示、比较、储存、查询等功能。

关键词：血压计；传感器；液晶显示；AT89C51单片机

Based on single chip microcomputer AT89C51 electronic blood pressure device

design

Abstract

With the rapid development in modern science and technology，the intensive strength and high pressure are brought to us in our lives.With the continuous improvement of living standards, as well as the increasing proportion of the aging of population,electronic medical equipment has gradually become a new trend in families,while electronic blood pressure monitor is a typical one of the family medical testing equipments.Blood pressure,being an significant life parameter for human boday,plays an important role in accurate measurement,particularly in clinical medicine and health protection areas.

At present,the blood pressure monitor can be roughly divided into two categories.The first one is mercury sphygmomanometer with its stable numerical value as advantage and its great visual observation error,high subjectivity,portable difficulty,necessity of being operated by health care professionals as shortcomings.The second type is electronic blood pressure monitors.Its advantages are included simple to use,convenient to operate,and easy to record the measured value,handy and portable. Electronic blood pressure monitor has so many advantages,which makes it more and more popular in public families.

The electronic blood pressure monitor,which is introduced in this paper,employs oscillographic testing principle,centralized by the AT89C51 single-chip microcomputer,supplemented by US9111-006-D type pressure sensor and analog signal processing between MCU,finishes the digital singal convertion,LCD,warning alarm,auto power off circuits etc. By AD converter to realize a homely used electronic blood pressure monitor.In this design,by amplifying the input from the analog pulse,converting the analog signal to digital signal via using AD converter and lastly operating by single-chip microcomputer,the features of displaying,comparing,storing and searching are finished.

Key words: blood pressure monitors; sensors; liquid crystal display; AT89C51 single-chip