STC89C51单片机心率计设计
将经过整形放大的红外光电传感器部分，所生成一个脉冲信号来对单片机进行输入控制，因而能迅速方便地检测出相应的心率。该系统可用于用户测量脉搏速率的时间，但也可以设置一个上限频率和下限频率时测量范围超过该范围设定蜂鸣器报警，脉冲信号可以被收集作为最后的结果显示在1602LCD显示器上。
毕业论文关键词： STC89C51 脉搏检测仪 LCD显示器
heart rate pulse meter based on 51 single-chip computer
Abstract：Pulse detector in everyone's daily life has been quite widely used, by observing the pulse of the image change, people's health can be detected, it is often used in health centers and hospitals. In order to make the pulse detector accuracy and ease of upgrade, this issue is designed based on 51 single pulse detector. System STC89C51 microcontroller core, photoelectric sensors use an internal microcontroller timer system to calculate the time, caused by the generation of light sensor sensing signal microcontroller can accumulate the signal obtained pulse beats, the timer set timer time . The system is run by watching flashing lights, flashes to indicate accurately detect even worth the result. When the system stops running, it will always pulse frequency and duration of display. After testing, the system is working properly, meet the design requirements.
Design of infrared photoelectric sensor generates a pulse signal, after plastic surgery to enlarge, proper control of the pulse signal input in the microcontroller, thereby detecting the pulse beats in one minute, quickly and easily. This system could be used to measure the pulse rate of the user time, but can also be set to a maximum frequency and minimum frequency range exceeds the range set alarm buzzer, In addition, a user can also set an alarm to remind measured daily, this time can be by their own setting, the pulse signal can be collected in 1602LCD displayed on the monitor as the final results.
Keywords：STC89C51 photos ens or LCD display Pulse measuring instrument
目 录
1 绪论 5
1.1 市面上心率计脉搏仪系统现状 5
1.2 该论文的主要内容 5
2.设计方案及选择元器件 7
2.1 研究内容及设计规范 7
2.2 方案设计与论证 7
2.3.1单片机AT89C2051 11
2.3.2红外传感器 11
2.3.3双运算放大器LM358N 12
3. 硬件系统设计 13
3.1 系统设计框图 13
3.2 信号采集电路 13
3.3信号放大电路 13
3.4信号比较电路 14
4. 系统软件设计 16
4.1测量计算原理 16
4.2主程序流程图 16