Presented in this paper is a design of pulse measuring instrument based on MCU, as the circuit module plays an important role in the system, such as heart rate acquisition circuit, display circuit and STC89C52 microcontroller through the serial port to realize the connection. This design with STC89C52 microcontroller as the central control unit, through ST188 as infrared photoelectric sensor to collect the pulse signal, after the lm358 for op amp; again through before and after filtering, magnifying, shaping, and get stable signal; functions to achieve the rapid detection of heart. You can also through the button to set the pulse value scope; buzzer driver module In the range beyond the scope of the alarm prompt, the measurement results in the liquid crystal display.
Experimental results show that the test results of the design and practical requirements are basically the same, STC89C52 MCU strong anti-interference ability and LCD1602 display control the advantages of more convenient so that these features can be successfully completed. The production cost less than 100 yuan, with low price, easy manipulation, low power consumption, high reliability, very applicable to families and individuals.
Heart rate) in professional terms is used to describe the human heart beat cycle. Pulse of modern Chinese will be interpreted as "heart beating frequency value; so the heart rate can also said in a unit of time, heart rhythm speed.
Everyone's heart rate signals mostly contains rich physiological and psychological information. This is due to the health of internal organs of the body can reflect in the pulse information. This discovery has gradually attracted the attention of many clinicians. In our country, pulse diagnosis has been regarded as the essence of Chinese medicine; so far the clinical practice has about 2600 years. However due to the use of fingers often there will be some sweat glands refers to pulse diagnosis in the presence of errors can not be ignored; and leads to inaccurate measurement. Then perhaps you would say and the ear vein measurement, instead of the previous is often used. Although by measuring ear ripple come to pulse signal relatively comparison Clean, but because the ear pulse signal is weak, especially when the seasonal changes, the measurement signal is vulnerable to the influence of environmental temperature,
resulting in inaccurate measurement values.
With the development and progress of world science and technology and economy, cherish life, health care has become a common pursuit of mankind throughout the world. According to the Health Bureau statistics, every year because of cardiovascular and cerebrovascular diseases death of the highest number of human deaths first, not only the high cost of health care, back to the family, the government and the society caused great burden. In recent years, due to the accelerated pace of life, unreasonable eating habits and many junk food impact and other reasons, the incidence of cardiovascular and cerebrovascular is showing a trend of rising year by year. How to scientifically and harmless reduce cardiovascular disease morbidity and mortality, effectively reduce cardiovascular and cerebrovascular diseases and social Family burden, has become a very serious problem faced by human beings all over the world.
World first lever type pulse scanner is Vierordt was founded in 1854. It is a lever and a pressure drum scanner uses the notation to record the pulse waveform, also is the human for the first time through non invasion of recording the human body pulse, then caused a great sensation. However the starting point for the development of domestic relatively is relatively low, in the early 50s of the 20th century Zhu Yancai will pulse instrument reference to objective study on the pulse diagnosis in traditional Chinese medicine. In recent years, non invasive vascular function detection gradually attracted the eyes of the medical professionals. Since about 1980, no trauma vascular function detection by using the small range, its principle is roughly Based on hemodynamic rheology theory and elastic chamber theory. Characterized in it by the module temperature, blood pressure cuff module, blood oxygen module of multi physiological signal acquisition module combination by of brachial artery blocking opening in the process of finger end temperature signal, oxygen saturation and pulse wave signal changes of the parameters of the, again according to the clinical trial data acquisition and through the method of signal processing and statistical analysis, establishment of vascular function quantitative evaluation formula and blood vessel function evaluation. It has noninvasive, simple operation, accurate, good repeatability and convenient for clinical application and automatically generates diagnosis of
