本课题设计了一种基于51单片机的脉搏测量仪。系统以AT89C51单片机为核心，以红外发光二极管和光敏三极管为传感器，并利用单片机系统内部定时器来计算时间，由光敏三极管感应产生脉冲，单片机通过对脉冲累加得到脉搏跳动次数，时间由定时器定时而得。传感器把采集到的用于检测脉搏跳动的红外光转换成电信号，这些电信号通过信号处理系统进行滤波、放大、整形得到符合要求的脉搏电信号，传给单片机，并通过单片机进行处理，最后由数码管显示每分钟的脉搏次数。系统停止运行时，能够显示总的脉搏次数和时间。经测试，系统工作正常，达到设计要求。

 

 

关键词：AT89C51单片机；脉搏测量仪；传感器；信号采集

 

 

In this paper, a pulse measuring instrument based on 51 single-chip microcomputer is designed. System to AT89C51 microcontroller as the core, with infrared light-emitting diodes and phototransistor as the sensor, and the use of single-chip system internal timer to calculate the time, by the photosensitive transistor induction pulse, single-chip pulse by adding the number of pulse beat, the time from the timer And so on. The sensor converts the infrared light collected for detecting the pulse beat into an electric signal. The electric signal is filtered, amplified and shaped by the signal processing system to obtain the required pulse electrical signal, which is transmitted to the single chip computer and processed by the single chip computer. Finally, The number of pulses per minute is displayed by the digital tube. When the system is stopped, the total number of pulses and time can be displayed. After testing, the system is working properly, to meet the design requirements.

The design of the pulse meter must be through the collection of human pulse changes caused by some of the biological signals, and then the biological signal into a physical signal, making these changes in the physical signal to express the pulse of the human body changes, and finally to the number of pulses per minute , It is necessary through the corresponding hardware circuit and chip to deal with physical changes and store the pulse frequency. In the hardware design in general the physical signal is the voltage change. The system consists of photoelectric sensors, signal processing, single-chip, digital display, power and other parts.

 

Key words: AT89C51 single chip; pulse measuring instrument; sensor; signal acquisition