基于单片机的电子血压计设计

基于单片机的电子血压计设计

基于单片机的电子血压计设计

摘要

单片机以其卓越的性能，得到广泛的应用，以深入到各个领域，已经成为一种比较成熟的技术，在医学方面更是得到了较好的应用。血压是极为重要的健康指标，血压测量的准确与否直接关系到人们的健康。现代人患心血管疾病呈低龄化趋势，所以随时关注我们的血压状况对我们百利无害。

本论文讨论了以AT89C51单片机为核心的电子血压计测量原理。气泵给气囊充气后通过感器传的电压经放大、滤波得到脉搏信号，计算出收缩压、舒张压和脉搏。重点介绍了单片机及滤波电路的设计。

首先依据示波法和脉搏波理论设计了血压测量系统的总体设计方案。该方案硬件电路以AT89C51单片机为核心，包括信号采集处理电路，A/D转换电路，控制按钮电路和显示电路等几大部分。本文对以上几个部分的软硬件设计作了详细的阐述，介绍了核心芯片的选型，外围电路的连接，芯片与芯片之间的连接电路，程序设计方法和相应的软件程序。讨论说明了各部分电路点的工作原理，以及其软硬件的具体设计。

关键词：单片机；血压；血压计；示波法；脉搏波

The design of portable blood pressure monitor

Abstract

Single chip with its superior performance, are widely used to drill in various fields has become a mature technology, in medicine all the more yes get a better application. Blood pressure is extremely important health indicators; blood pressure measurement accuracy is directly related to people's health. Modern cardiovascular disease trends showed younger age, so keep an eye on our blood pressure Bailey us harmless.

This paper studies in blood pressure measurement method and wave method, on the basis of pulse wave theory, discusses with AT89C51 measuring principle of electronic device. After the air to air pump, the voltage sensor through enlargement, filtering, calculate the pulse signal obtained systolic pressure, diastolic pressure and pulse. Mainly introduces the design and the entire circuit chip.

First of all, and the pulse wave based on oscillometric blood pressure measurement system design theory design project. The program hardware with AT89C51 microcontroller as the core, including signal acquisition and processing circuit, A / D converter circuit, memory expansion circuits, LCD circuits, Automatic Filling and Releasing circuit, most of the keyboard circuit a few. In this paper, several parts of the above detailed description of hardware and software design, introduced the selection of core chips, the external circuit connection, the connection between the chip and the chip circuit, program design methods and corresponding software program. Discussion illustrates the point of all parts of the circuit works, and the specific design of its hardware and software.

Keywords: Single-chip；blood pressure；Sphygmomanometer；Oscillometric method；pulse waveform

目录

摘要........................................................................................................................................... I Abstract................................................................................................................................. II 1 绪论 (1)

1.1 背景 (1)

1.2 血压测量方法 (1)

1.3 血压计测量现状 (2)

2 血压计设计原理 (3)

2.1 示波法测量血压原理 (3)

2.1.1 示波法概述 (3)

2.1.2 示波法原理 (3)

2.2 设计的总体思路 (4)

3 滤波电路设计 (6)

3.1 传感器 (6)

3.1.1 压力传感器简介 (6)

3.1.2 压力传感器的选用 (6)

3.2 滤波器设计 (7)

3.2.1 滤波器概述 (8)

3.2.2 低通滤波器设计 (9)

3.2.3 带通滤波器设计 (12)

4 单片机系统设计 (15)

4.1 单片机AT89C51 (15)