基于对单片机的脉搏测量仪的设计详解.doc

 摘 要 脉搏波所呈现出来的形态、强度、速率和节律等方面的综合信息，能反映出人体心血系统中许多生理疾病的血流特征。根据人体脉搏信号特征，本论文设计了一种基于单片机的脉搏测量系统。 系统采用红外发射与接收二极管充当脉搏传感器来采集脉搏信号。首先将采集到的信号通过低通滤波与放大电路对脉搏信号进行处理，然后，将放大的脉搏信号通过整形电路进行电压基准变化，在经过一次放大电路对整形后的脉搏信号进行放大，将信号转换为AT89S52单片机易于处理的脉冲信号。通过单片机编程对脉冲信号进行处理，测量出一分钟内的脉搏次数，最终在数码管中直观的显示出来。 为了节省时间，一般不会作一分钟的测量，通常是测量10秒钟时间内的脉搏数，再把结果乘以6即得到每分钟的脉搏数。发光二极管可以通过发光的形式显示脉搏的跳动。 关键词：脉搏测量仪；AT89S52；LED；信号处理 The Design of Pulse Measurement Instrument Based on Single Chip Microcomputer ABSTRACT Comprehensive information form, strength, speed and rhythm of the pulse wave show, can reflect the human cardiovascular system flow characteristic in many physiological diseases. According to the characteristics of the human pulse signals, this paper designed a pulse measurement system based on mcu. System uses infrared emitting and receiving diode acts as a pulse sensor to collect the pulse signal. Firstly, the collected signal through low-pass filtering and amplifying circuit for pulse signal processing, then, the pulse signal amplification of the voltage reference change through the shaping circuit, after an amplifying circuit amplifies the pulse signal after shaping, the signal is converted into AT89S52 microcontroller manageable pulse signal. Processing through the MCU programming on the pulse signal, measured the pulse of one minute, times, finally in the digital tube display. In order to save time, generally not as a measure of a minute, often is the number of pulse measurement 10 seconds, then the result is multiplied by 6 to obtain the pulse number per minute. Light emitting diode can be displayed by light pulse. Key words: Pulse measuring instrument; AT89S52; LED; Signal processing 目 录 摘 要 I ABSTRACT II 第一章 绪论 1 1.1 脉搏测量仪介绍 1 1.2 脉搏测量仪的应用 1 1.3 本设计所要实现的目标 2 1.4 本文的设计方案：采用以单片机为核心的控制方案 2 第二章 主要器件介绍 3 2.1 单片机的选择 3 2.1.1 AT89S52简介 3 2.1.2 AT89S52的特点 3 2.1.3 AT89S52引脚功能说明 4 2.2 传感器的选择 6 2.2.1 红外发光二极管简介 7 2.2.2 光敏三极管简介 7 2.3 驱动芯片的选择 8 2.3.1 74LS245简介 8 2.3.2 74LS04简介 8 2.4 显示器的选择 9 2.4.