Heartbeat of burgeoning intelligence human body detects the design program of device

  • Time:
  • Click:124
  • source:DALLMAN CNC Machining
0 foreword heartbeat is a very important life information in human body, and traditional diagnosis by feeling the pulse because its are qualitative change the precision that affected heartbeat test with subjective sex, become application of diagnosis by feeling the pulse of doctor of traditional Chinese medicine, development and communication to restrict an element mediumly. To raise the test precision of signal of pair of medicine of this kind of biology, must combine modern science and technology. Use at detecting at present the instrument of the heartbeat is very much, have the test unit that is based on the type such as sensor of pressure sensor, photoelectricity, capacitance sensor and electroacoustic sensor commonly, but the choice that checks place to pulse does not have too big distinction, the instrument that measures accurately to can showing end undertakes pulse is less still. The heartbeat of intelligent human body that introduces here detects device can realize what human body points to end to not have achieve measure, test procedure is simple, can measure a palpitant number accurately, implementation data shows and go up, floor level warning function. If 1 device composition and composition of working principle system pursue 1 is shown. This design with sheet piece machine AT89C2051 is core, collect pulse signal by photoelectricity sensor, the pulse signal related to pulse gets after circuit of enlarge of the buy before the course, filter wave circuit, integral and comparator, this pulse signal serves as interrupt signal to hand in by sheet piece machine the consideration that has pulse cycle. Reach next minutely pulse beating frequency (namely heartbeat) , show a heartbeat on digital canal, use warning function of the floor level on software implementation at the same time, measuring data to exceed normal range (if be more than 180 times / Min or be less than 45 times / undertake calling the police to notice in order to warn a doctor when Min) . Graph heartbeat of 1 intelligence human body detects circuit of 2 device hardware designs device principle block diagram 2.

Because 1 sensor and signal processing circuit organize medium arterial composition content in human body finger tip tall, and finger tip ply is organized relative to someone else body and character is compared thin, detect through finger hind.

light intensity is opposite bigger, because of sensor of pulse of this photoelectricity type measure place to be in human body finger tip. a pair infra-red blast off with receive probe park hand to point to two side, follow the systole with periodic heart and diastole when arterial blood-vessel, when the haemal volume of arterial blood-vessel produces change subsequently, infra-red receive probe to be received contract periodicly along with the heart and the signal of arterial beating smooth pulse of diastole, collect heart throb signal thereby. Detect the sensor of the heartbeat is used infra-red one 05Y2 of pair of tubal HRl068C and PT331C. Because show from human body hand the physiology signal that collects is very faint, its extent arrives in small bend over commonly the quantitative class limits of millivolt, and be disturbed as a result of limbs movement and stronger labour frequency in checking a process and produce many noise. Level of the put before the pulse signal that wants to will be collected at the same time is passed magnifies circuit undertakes magnifying times higher, this has tall gain and Gao Gongmo to restrain with respect to requirement circuit than, be in at least 80 DB above, namely compositive carry is put should have very tall in all the model is restrained extremely lower than mixing 0 float etc, chooses resistor parameter wants as far as possible accurate. Magnify circuit is comprised by resistor network and OP07, the buy before sensor is reached magnifies circuit is shown 2 times like the graph. Graph circuit of enlarge of the buy before 2 sensor are reached because the element such as noise of inside and outside and interference of frequency of 50 Hz labour, although circuit is had very tall in all the model is restrained than, but pulse signal is very faint, flood in depending on faze signal, because frequency of pulse signal the highest peak in a mountain range is controlled in 1 Hz, the heft with stronger energy also is under 20 Hz, the design is so low the upper limit that understands filter ends frequency is 40 Hz. To be versed in frequency is disturbed, use block of symmetry double T to allow active defect wave implement special to its filter is divided. Sheet can receive after plastics of repass integral, comparator piece the signal of pulse of 0 ～ 5 V of the standard that machine place needs. If circuit of filter wave, defect wave and integral comparator pursue 3 are shown. Graph circuit of 3 filter wave, defect wave and integral comparator 2.

2 sheet piece engine control and indication circuit is odd an engine control and indication circuit is shown 4 times like the graph. Use dynamic indication means, use sheet piece the P1 of the P1 mouth of machine.

0 ～ P1.

The 6 inputs that run 7 paragraphs of yards as the number. Use P3.

0, p3.

1, p3.

2, p3.

The 3 pitch on signal that provide as 4 numbers (4) seeing a picture. The heartbeat pulse that outputs from photoelectricity sensor serves as interrupt signal to receive sheet directly piece the 9 feet of machine 89C2051 (namely T1 carries) . Time by T0, t1 computation. P1.

Of 7 output heartbeat go up, floor level alarm signal, warning apparatus of classics diode drive calls the police. When the heartbeat under floor level 45 / call the police when Min give out long sound to call the police. Be careful to lead prep above upper limit 180 times / the warning apparatus when Min gives out short sound to call the police. Graph 4 sheet piece engine control and flow chart of software of system of 3 software design is like indication circuit the graph is shown 5 times. Will show a heartbeat thousands of, 100, 10, digit is deposited respectively in 89C2051 sheet piece the 41H of machine interior, 42H, 43H, inside 44H unit. Use dynamic scanning, every other 5 Ms shows 1000 by turns respectively, 100, 10, . When sheet piece when the 9th foot of machine has one ascendant follow, t1 base count 1, t0 time 50 Ms, time circularly 1 200 second, t1 computation is heartbeat frequency namely. Return a main program to continue to execute indication order next. Graph 4 circuit debug flow chart of 5 systems software the pulse signal that reaching noise to analyse circuit to debug basically is pair of inputs undertakes filter wave and enlarge, debugged effect matters to the accuracy that data collects directly. Pass a test to be able to be informed, serious noise exists to disturb in pulse signal, put level magnifies before the design of circuit is crucial. The signal generator of DFl405 number synthesis that uses limited company of electron of peaceful wave the second best plan comes imitate pulse signal, signal frequency is taller, signal handles circuit to high frequency signal (106 Hz is controlled) have very good attenuation effect, when signal frequency moderate when, signal can undertake enlarge according to the need of the design. Wave of 50 Hz defect implement very good to was versed in arrive since frequency interference inhibition. Can receive sheet to pulse signal plastics through integral, comparator piece the pulse signal of machine need. Through overall debug, the system achieved expectant design demand. In measuring a process, the pulse signal that sensor collects is very faint, be disturbed easily by outside ambient, because this needs the interference of pair of pulse sensor,noise undertakes an analysis. Of sensor of photoelectricity type pulse basically have measure ambient light interference, electromagnetism interference, measure process motion noise to disturb. To reduce the effect that ambient light measures to pulse signal, consider the convenient sex that sensor uses at the same time, use the packing means of sealed fingertip type, whole case uses not pervious to light medium and color, reduce the effect of outside ambient light as far as possible. The contains pulse information telegraphic order that through photoelectricity changeover receives is compared commonly faint, get easily the interference of outside electromagnetism signal, because this undertakes proper screen processing to hardware circuit. Pulse signal change is slow, be versed in particularly easily the interference of frequency signal, use defect wave implement solved this one problem effectively. Measuring a process in the center, the contact that makes fingertip and finger closer reduced the opposite motion between them, reduced athletic noise. 5 epilogue heartbeat detects medium crucial technology depends on sensor make and the enlarge problem of faint pulse signal. Make through actual design, the result confirmed the rationality of this design and feasibility, the transmission type sensor that the specification designs with science can realize the nondestructive of finger pulse to detect. But in small signal enlarge technology respect remains at further research. Compare with other heartbeat detector, the volume of this device is minor, weight is light, cost is low, use convenient, measure accurate etc, have very good application perspective. CNC Milling CNC Machining