CN104305985A - Low-power-consumption heart rate monitor and monitoring method thereof - Google Patents
Low-power-consumption heart rate monitor and monitoring method thereof Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
- A61B5/02455—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals provided with high/low alarm devices
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
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Abstract
The invention discloses a low-power-consumption heart rate monitor and a monitoring method thereof. The low-power-consumption heart rate monitor comprises a three-operational-amplifier five-stage low-power-consumption electrocardio extracting circuit, a single chip microcomputer, a display module, a low-power-consumption Bluetooth chip module and a moving terminal. The ultralow-power-consumption single chip microcomputer based on MSP430F5529 uses a differential method to detect R waves to realize heart rate calculation and display by extracting I-lead electrocardio signals, can display wave forms and give alarms and transmits data and electrocardio images through a serial port or Bluetooth. The low-power-consumption heart rate monitor can be powered by a battery of 3V-4.5V, and the three-operational-amplifier five-stage low-power-consumption electrocardio extracting circuit and the Bluetooth 4.0BLE module which are in active and passive combining are adopted, thereby being low in power consumption. Test results show that electrocardio signals extracted by the low-power-consumption heart rate monitor are low in distortion, and the monitor is accurate in heart rate measuring and calculating and has good popularization and utilization prospect.
Description
Technical field
The present invention relates to low-power consumption heart rate monitor field, particularly relates to a kind of low-power consumption heart rate monitor and monitoring method thereof.
Background technology
Rhythm of the heart is that life neutralization is conventional clinically, and it has important use in motion strength detection, physical examinations, medical diagnosis on disease etc.Ecg wave form then has larger clinical value.If heart rate and cardiac electrical data collection can be got up, do long-term analysis, then have larger clinical and scientific research value.But, because electrocardiosignal is the periodicity small-signal of low signal-to-noise ratio, in gatherer process, be easily subject to the impact in instrument, human body etc., and be mixed with very strong Hz noise, so need the signal extracting circuit of certain extractability.
Existing commercially available heart rate measuring instrument, often function singleness, lacks the additional function of some practicalities outside heart rate; Data can only show and can not transmit or record, narrow application range; If realize more multi-functional, then power consumption is easily higher again.Thus it is of great value for developing a kind of Cardio kickboxing that can overcome above-mentioned shortcoming.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of portable, daily low-power consumption heart rate monitor, is more suitable for people's routine health measurement at ordinary times necessary for monitoring.This low-power consumption heart rate monitor structure is simple, carry out the switching of monitoring function by three buttons that manipulation display is other, provide the too low or too high prompting of the real-time number of times of heart rate, heart rate 30 seconds average times, ecg wave form, ST wave spacing, heart rate etc. multiple to user
Utilitarian function.
Technical scheme of the present invention is as follows:
Low-power consumption heart rate monitor comprises three amplifier Pyatyi low-power consumption electrocardios and extracts circuit, single-chip microcomputer, display module, low-power consumption Bluetooth chip module and mobile terminal, the I conducting wire connecting human body is enclosed within three amplifier Pyatyi low-power consumption electrocardios and extracts on the copper pin of circuit, the output stage that three amplifier Pyatyi low-power consumption electrocardios extract circuit is connected by Du Pont's line with single-chip microcomputer, EGC parameter after single-chip microcomputer process and waveform, be presented on display module on the one hand, pass through serial ports or bluetooth module transmission EGC parameter and waveform on the other hand to mobile terminal.
Described single-chip microcomputer is MSP430F5529 single-chip microcomputer, and display module is Nokia5110 display module, and low-power consumption Bluetooth chip module is CC2540/2541 low-power consumption Bluetooth chip module.
Three described amplifier Pyatyi low-power consumption electrocardios extract circuit and comprise power transfer module connected in turn, differential amplifier circuit module, 1Hz high-pass filtering module, 100Hz low-pass filtering module, 50Hz notch filter module and amplify and level lifting module.
Described power transfer module adopts TPS60400 charge pump voltage reversal device, what the amplifier in differential amplifier circuit module adopted is INA126 difference instrument amplifier, the operational amplifier that 100Hz low-pass filtering module adopts is OPA227 operational amplifier, and amplifying the operational amplifier adopted with level lifting module is OPA333 operational amplifier.
What described 100Hz low-pass filtering module adopted is second order active Butterworth filter, and what 1Hz high-pass filtering module adopted is the passive Butterworth filter of single order, and what 50Hz power frequency danger mode block adopted is passive double-T shaped notch filter.
The software processes of described MSP430F5529 super low power consuming single chip processor comprises timing and sampling, 50Hz digital filtering, calculus of finite differences R ripple detects, the calculating of instant heart rate and average heart rate, the self study of R ripple detection threshold, system initialization setting and low power consumption control, button detects, ST wave spacing detects, liquid crystal drive, heart rate interface and heart rate export, rippled interface display and alert interface display, the display at setting interface, alarm lamp switch sets, backlight switch sets, UART serial ports transmit button sets, UART serial data is encoded, UART serial data is sent to low-power consumption Bluetooth chip module.
Described mobile terminal APP/HeartRate can receive data that low-power consumption Bluetooth chip module sends, carries out data decoding, shows instant heart rate, average heart rate, ST interval data and ecg wave form.
It is based on bluetooth 4.0 agreement that described low-power consumption Bluetooth chip module and mobile terminal APP carry out that data transmit.
The low-power consumption heart rate monitoring method of described Cardio kickboxing, it is characterized in that utilizing I conducting wire to extract I to lead electrocardiosignal, extract circuit through three amplifier Pyatyi low-power consumption electrocardios and carry out advance signal process, carry out the amplification of electrocardiosignal, filtering and level lifting, then circuit output signal is imported into single-chip microcomputer, single-chip microcomputer adopts the sample frequency of 500 times/s, detect with button, and 50Hz digital filtering is carried out to the electrocardiosignal of input, single-chip microcomputer utilizes the detection of calculus of finite differences R ripple to carry out heart rate calculating, the display of waveform and data is carried out on display screen, finally by low-power consumption Bluetooth chip module, EGC parameter and ecg wave form are transferred to mobile terminal APP show.
In the low-power consumption heart rate monitoring method of described Cardio kickboxing button detect by the main button of P1.2(), P1.3 and P1.4(two modifier keys) interruption come.Corresponding I/O port ground connection when button is pressed, produces trailing edge and interrupts.Resetted by interrupt identification immediately afterwards, information of being pressed by button is saved in intermediate variable, intermediate variable is resetted after processing button again.
In the low-power consumption heart rate monitoring method of described Cardio kickboxing, timing is realized by the Timer_B timer that MSP430 carries, and every 1/500s, the MCU waken up under low-power consumption mode LPM0 state by timer interruption carrys out work.Count up from 0 to 29999 circulations with a timing variable, obtain the time in 1 minute.
In the low-power consumption heart rate monitoring method of described Cardio kickboxing, R ripple detects is utilize the many feature more precipitous than other waveform rising edges of R ripple rising edge in ecg wave form, and employing second order difference method detects the R ripple in ecg wave form.
It is the UART serial ports (configuring its baud rate is 115200) that MSP430F5529 carries that the low-power consumption heart rate monitoring method communication of described Cardio kickboxing exports what adopt, with certain string format, exports instant heart rate, average heart rate and cardiac electrical data.
The invention has the beneficial effects as follows, in people's daily life, detecting & monitoring easily can be carried out to its EGC parameter normal condition, and there is the features such as structure is simple, power consumption is lower and easy to use.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is low-power consumption heart rate monitor structural representation;
Fig. 2 is the circuit diagram of the high pass filter of pre-differential amplifier circuit of the present invention and 1Hz;
The circuit diagram of Fig. 3 to be cut-off frequency of the present invention be low pass filter of 100Hz;
Fig. 4 is that the present invention finally amplifies the circuit diagram with level lifting circuit;
Fig. 5 is the circuit diagram of 50Hz power frequency notch filter of the present invention;
Fig. 6 is the circuit diagram of negative supply modular converter of the present invention;
Fig. 7 is that heart rate of the present invention calculates core algorithm schematic diagram;
Fig. 8 is APP interfacial structure figure of the present invention.
In figure: three amplifier Pyatyi formula low-power consumption electrocardios extract circuit 1, MSP430F5529 single-chip microcomputer 2, power supply 3, Nokia5110 display module 4, user operation button 5, connecting line 6 between parts, heart rate data display 7, ecg wave form display 8.
Detailed description of the invention
Below in conjunction with accompanying drawing 1, to Fig. 8, the invention will be further described.
Fig. 1 illustrates the ultimate principle of native system.Native system is amplified by three amplifier Pyatyi signals of active and passive combination and extracts signal with filter circuit, detects the R ripple in ecg wave form by five points difference method, carries out display afterwards and data are transmitted, and realizes some additional functions.Power supply can be two joint 1.5V aneroid battery.
In Fig. 2, the three amplifier Pyatyi formula low-power consumption electrocardios that a kind of low-power consumption heart rate monitor comprises Fig. 2 upper left extract circuit, the supplying cell of Fig. 2 upper right quarter, the single-chip microcomputer calculation and control modules of Fig. 2 lower left quarter, and the display screen of Fig. 2 right lower quadrant and control knob.Fig. 2 upper left three amplifier Pyatyi formula low-power consumption electrocardio extract circuit by pre-differential amplifier circuit, cut-off frequency be the high pass filter of 1Hz, cut-off frequency is the low pass filter of 100Hz, 50Hz power frequency notch filter and final amplification form with level lifting circuit.The power pack of Fig. 2 upper right quarter adopts 2 joint 1.5V aneroid battery to realize, and the negative supply that wherein electrocardiosignal extracts circuit used is realized by TPS60400 charge pump voltage reversal device.The single-chip microcomputer calculation and control module of Fig. 2 lower left quarter adopts MSP430F5529 chip microcontroller.MSP430 series monolithic is a kind of 16 single-chip microcomputers of low-power consumption, and 3V can be adopted to power, and peripheral module enriches, and is applicable to the realization of this cardiotachometer.Heart rate can be further divided into again calculate and system flow control two large divisions.Fig. 2 lower right-most portion is output.Comprise display to export and communication output.Display exports instant heart rate, average heart rate, ecg wave form, warning message and some configuration informations.The display adopted is Nokia5110 module.What communication exported employing is the UART serial ports that MSP430F5529 carries, and with certain string format, exports heart rate (instant, average) and cardiac electrical data.If UART serial ports is turned UART module with USB be connected, just data can be sent to computer.If be connected with bluetooth serial ports transparent transmission module by UART serial ports, just heart rate can be seen on the bluetooth equipments such as mobile phone.What native system adopted is a module based on TI company CC252541 low-power consumption Bluetooth chip---the HM-11 bluetooth 4.0 BLE low-power consumption bluetooth serial ports transparent transmission module that Jinan Hua Mao company produces.And on Android system, achieve the display of instantaneous heart rate and average heart rate.
In Fig. 3, Fig. 4 and Fig. 5, a kind of low-power consumption heart rate monitor importation comprises, first human body I lead electrocardio extract circuit.Its two be user key-press operation input, for switching each function.Human body I lead electrocardio extract circuit be made up of Pyatyi.The first order is pre-differential amplifier circuit.Carry out enlarge leadingly, the signal after processed has the performances such as low common mode, low noise, low drifting signal.INA126 difference amplifier is adopted to realize.The high pass filter of to be cut-off frequency be in second level 1Hz.Process baseline drift.RC passive filtering is adopted to realize.The low pass filter of the third level to be cut-off frequency be 100Hz.Process High-frequency Interference.Adopt second order Butterworth active filter to realize, amplifier is accurate amplifier OPA227.The fourth stage is 50Hz power frequency notch filter.Reduce Hz noise as far as possible, the ecg wave form that can distinguish could be shown on oscillograph like this.Double-T shaped passive filtering is adopted to realize.Level V is final amplification and level lifting circuit.Form in-phase proportion adder with an OPA333 single supply op, electrocardiosignal is finally amplified to about amplitude 1V, and superpose with power supply dividing potential drop, be lifted to the interval of 1 ~ 2V.3.3V single supply op plays the effect of protection ADC simultaneously.Send into ADC module afterwards.In order to ensure signal quality, take the method for right lower limb ground connection, being connected with the GND of system by RL.System design input impedance 40M Ω, emulates total magnification when recording 25Hz step by step and is about 500 times.
The process that a kind of low-power consumption heart rate monitor heart rate calculates is illustrated in Fig. 6.
Heart rate Computing Principle is as follows.
Electrocardiosignal inputs from ADC with the sample frequency of 500 times/s.
Carry out 50Hz Wave-Smoothing Digital Filtration afterwards.Filtering method is smothing filtering method, by the meansigma methods of this and front 9 ADC sampled result as this electrocardiogram (ECG) data.ADC sampled result is represented with x, the electrocardiogram (ECG) data that y obtains after representing process, then y (n)=[x (n)+x (n-1)+x (n-2)+x (n-3)+x (n-4)+x (n-5)+x (n-6)+x (n-7)+x (n-8)+x (n-9)]/10.
In addition five points difference process is carried out afterwards.Represent difference result with z, then have z (n)=2y (n)+y (n-1)-y (n-3)-2y (n-4).
Five points difference value is compared with threshold value m, often namely be designated as a R ripple more than a m, in this, as judge ecg-r wave according to (if but detect two R wave spacings are too short (is less than 0.16s, namely heart rate is greater than 375 beats/min), just think that secondary R wave is pseudo wave, do not count) afterwards according to calculating instant heart rate the interval time of 3 R ripples, formula is instant heart rate=90000/ (time differences of 3 R ripples); Average heart rate is calculated according to the R ripple number of times within certain hour (15s, 30s, 60s).
Threshold value is obtained by self-learning algorithm, and computing formula is electrocardiogram (ECG) data minima in electrocardio data maximums-2 seconds in threshold value m=(2 second) * 0.5.
Fig. 7 illustrates the Row control of system.System flow controls by realizing MSP430F5529 mcu programming.During system idles, single-chip microcomputer enters LPM0 low-power consumption mode to save electric power.By the functional mode of 1 main button and 2 modifier key control system, heart rate and average heart rate display mode, ecg wave form pattern, alarm mode can be selected, and the switch of backlight, alarm lamp and communication function can be set.Under arbitrary pattern, the collection of electrocardiosignal and the calculating of heart rate are carried out all in real time.
The heart rate display be on Android system of Fig. 8 displaying, comprises the function such as instantaneous heart rate, 15 seconds average heart rates.
Claims (9)
1. a low-power consumption heart rate monitor, it is characterized in that comprising three amplifier Pyatyi low-power consumption electrocardios extracts circuit, single-chip microcomputer, display module, low-power consumption Bluetooth chip module and mobile terminal, the I conducting wire connecting human body is enclosed within three amplifier Pyatyi low-power consumption electrocardios and extracts on the copper pin of circuit, the output stage that three amplifier Pyatyi low-power consumption electrocardios extract circuit is connected by Du Pont's line with single-chip microcomputer, EGC parameter after single-chip microcomputer process and waveform, be presented on display module on the one hand, pass through serial ports or bluetooth module transmission EGC parameter and waveform on the other hand to mobile terminal.
2. a kind of low-power consumption heart rate monitor according to claim 1, it is characterized in that described single-chip microcomputer is MSP430F5529 single-chip microcomputer, display module is Nokia5110 display module, and low-power consumption Bluetooth chip module is CC2540/2541 low-power consumption Bluetooth chip module.
3. a kind of low-power consumption heart rate monitor according to claim 1, is characterized in that three described amplifier Pyatyi low-power consumption electrocardios extract circuit and comprise power transfer module connected in turn, differential amplifier circuit module, 1Hz high-pass filtering module, 100Hz low-pass filtering module, 50Hz notch filter module and amplify and level lifting module.
4. a kind of low-power consumption heart rate monitor according to claim 3, it is characterized in that described power transfer module adopts TPS60400 charge pump voltage reversal device, what the amplifier in differential amplifier circuit module adopted is INA126 difference instrument amplifier, the operational amplifier that 100Hz low-pass filtering module adopts is OPA227 operational amplifier, and amplifying the operational amplifier adopted with level lifting module is OPA333 operational amplifier.
5. a kind of low-power consumption heart rate monitor according to claim 3, what it is characterized in that described 100Hz low-pass filtering module employing is second order active Butterworth filter, what 1Hz high-pass filtering module adopted is the passive Butterworth filter of single order, and what 50Hz power frequency danger mode block adopted is passive double-T shaped notch filter.
6. a kind of low-power consumption heart rate monitor according to claim 1, it is characterized in that the software processes of described MSP430F5529 super low power consuming single chip processor comprises timing and sampling, 50Hz digital filtering, calculus of finite differences R ripple detects, the calculating of instant heart rate and average heart rate, the self study of R ripple detection threshold, system initialization setting and low power consumption control, button detects, ST wave spacing detects, liquid crystal drive, heart rate interface and heart rate export, rippled interface display and alert interface display, the display at setting interface, alarm lamp switch sets, backlight switch sets, UART serial ports transmit button sets, UART serial data is encoded, UART serial data is sent to low-power consumption Bluetooth chip module.
7. a kind of low-power consumption heart rate monitor according to claim 1, is characterized in that data that described mobile terminal APP/HeartRate can receive low-power consumption Bluetooth chip module and send, carries out data decoding, shows instant heart rate, average heart rate, ST interval data and ecg wave form.
8. a kind of low-power consumption heart rate monitor according to claim 1, it is characterized in that described low-power consumption Bluetooth chip module and mobile terminal APP carry out that data transmit is based on bluetooth 4.0 agreement.
9. the low-power consumption heart rate monitoring method of a Cardio kickboxing as claimed in claim 1, it is characterized in that utilizing I conducting wire to extract I to lead electrocardiosignal, extract circuit through three amplifier Pyatyi low-power consumption electrocardios and carry out advance signal process, carry out the amplification of electrocardiosignal, filtering and level lifting, then circuit output signal is imported into single-chip microcomputer, single-chip microcomputer adopts the sample frequency of 500 times/s, detect with button, and 50Hz digital filtering is carried out to the electrocardiosignal of input, single-chip microcomputer utilizes the detection of calculus of finite differences R ripple to carry out heart rate calculating, the display of waveform and data is carried out on display screen, finally by low-power consumption Bluetooth chip module, EGC parameter and ecg wave form are transferred to mobile terminal APP show.
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Inventor after: Li Chaohao Inventor after: Huang Zhongyi Inventor after: Tong Xinhan Inventor before: Li Chaohao Inventor before: Huang Zhongyi Inventor before: Tong Xinhan |
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Application publication date: 20150128 |
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