河南理工大学毕业设计（论文）说明书
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 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,
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河南理工大学毕业设计（论文）说明书
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
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河南理工大学毕业设计（论文）说明书
cardiovascular function, health status analysis and gives related medical solution Release.
Now pulse testing is no longer confined to the traditional manual testing or stethoscope test, only use electronic devices can be obtained more accurate data. In today's society, most of electronic measuring instruments has been directed towards the digitization, automation development direction. Pulse measuring instrument is not only good performance, simple structure, and has good value of application and popularization. In general, the pulse measurement instrument development is mainly the following trends: first, in the absence of human can automatically analyze the measurement of pulse value; the pulse of the traditional instrument need after experienced doctor pulse signal of the first initial analysis and then make a comprehensive analysis to final To confirm the results, this method of total said to not only waste a lot of manpower and by factitious error is relatively large. The second: the wide application of digital technology and other advanced technology; pulse measuring instrument integration to want to achieve a higher degree, and are more convenient to carry must rely on the rapid development of digital science and technology; at the same time digital signal processing application will enable interference becomes smaller measurement result is more accurate. The third: multi function of more and more obvious. The fourth: cheap, easy to carry and application and popularization value better, to the general public convenience.
Has always been in the hospital for basis for clinical diagnosis and treatment of most source extracted from the human pulse wave in physiological and pathological information. In China, feeling the pulse is old doctor of traditional Chinese medicine is the most commonly used to diagnose disease, has been in use ever since. The pulse signal emitted by human body contains the velocity of heart rate, full waveform, period and amplitude, a full range of integrated information, in a large extent can reflect human body each part information (for example blood viscosity, blood velocity). Although these biological signals exist in the human body, the signal intensity relative to said is relatively weak; if in a noisy environment effect is more obvious.
This graduation design principle is the use of single-chip microprocessor
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河南理工大学毕业设计（论文）说明书
STC89C52 as the center processor; pulse signal is collected by the sensor, through the microcontroller chip in the interior of the system timer to set the time; finally get the heart rate beat numerical by STC89C52 microcontroller to signal accumulation can be. Normal heartbeat is about 60-100 per minute times, circuit diagram of key module can through the button to set the scope of people's heart rate, above or below the setting range of possible heart there will be risks, buzzer driver module will drive buzzer alarm; the final measurement results Will be displayed on the LCD. The design can by viewing the IR indicates whether the lights and flashing, if sustained, stable flashing that test results are correct and error is small. With the assumption that the display results back and forth rock and numerical difference between the larger, there may exist error. Through the above steps, can roughly determine the body's own health, and is particularly suitable to be used to the individual or family, is also sometimes used in nursing homes and healthcare center.
The design of the selection of SCM is STC89C52。STC89C52 is STC company production of a low power, High Performance CMOS 8-bit microcontroller, with 8K bytes
of
in
system
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classic
MCS-51
core
flash
memory
programming.STC89C52, but lots of improvements make the chip with traditional 51 microcontroller does not have the function. In a single chip, has a versatile 8-bit CPU with in system programmable flash. STC89C52 makes for many embedded control application system provides a highly flexible, super efficient solution. With the following standard features: 8K bytes of flash, 512 Bytes of ram, 32 I / O lines, watchdog timer, built-in 4KB EEPROM and max810 reset circuit, three 16 bit timers / counters, four external interrupt, a 7 vector 4 level interrupt structure (compatible with traditional 51 5 vector two-level interrupt structure), a full duplex serial port. Also STC89X52 can be reduced to 0 Hz static logic operation, support two software selectable power-saving mode. In idle mode stops the CPU and allowing the ram, timer / counter, serial port, and interrupt system to work. Power down protection, the RAM contents is Save, the oscillator is frozen, the microcontroller all work to stop until the next interrupt or hardware reset so far. The maximum operating frequency of 6T/12T, 35MHz optional.
STC89C52 has the following characteristics: STC89C52with MCS-51 series
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河南理工大学毕业设计（论文）说明书
single chip microcomputer in instruction system and the pin is fully compatible with; on-chip 4K byte online can repeat programming flash program memory; static job, scope of work: Hz ~ 24MHz; three level program memory encryption; 128 x 8-bit internal RAM; 32 bit bidirectional input and output lines; two 16 bit timer / counter five interrupt sources, two-level interrupt priority; a full duplex asynchronous serial port; intermittent and power down two work strong anti-interference: High anti-static ESD protection, easy 2KV/4KV fast pulse interference; wide voltage, power supply are not afraid of jitter; wide temperature range, - 40 DEG C to 85 DEG C; prohibit the ale output;; ultra low power consumption: power down mode: typical power consumption < 0.1 Mu A; idle mode: typical power consumption 2mA. In normal operation mode: typical power 4mA-7mA; off electric mode can be by external interrupt awaken, applicable for battery powered systems, such as a water meter, gas meter, portable equipment, etc.。
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基于单片机的外文翻译
