CN202981972U - Piezoelectric buzzer based wireless pulse device - Google Patents
Piezoelectric buzzer based wireless pulse device Download PDFInfo
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- CN202981972U CN202981972U CN 201220719558 CN201220719558U CN202981972U CN 202981972 U CN202981972 U CN 202981972U CN 201220719558 CN201220719558 CN 201220719558 CN 201220719558 U CN201220719558 U CN 201220719558U CN 202981972 U CN202981972 U CN 202981972U
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Abstract
The utility model discloses a piezoelectric buzzer based wireless pulse device which comprises a piezoelectric buzzer, a signal conditioning circuit, an air sac, a pressure sensor, a main control data acquiring chip, a signal transmitting antenna, a data receiving chip, a receiving end power source and a signal receiving antenna. The piezoelectric buzzer is used for measuring pulse, and the pressure sensor is used for measuring pressure of the air sac. The main control data acquiring chip and the data receiving chip are connected through the wireless network, the main control data acquiring chip acquires output signals of the piezoelectric buzzer through the signal conditioning circuit, controls the air sac to generate rated pressure and acquires output signals of the pressure sensor, the data receiving chip receives pulse signals transmitted by the main control data acquiring chip through the ZigBee network, and the signal transmitting antenna and the signal receiving antenna form a hardware interface for wireless network communication. The piezoelectric buzzer can quickly and accurately measure pulse signals and perform wireless transmission and receiving.
Description
Technical field
This utility model relates to a kind of wireless pulse meter device based on piezoelectricity singing piece, is mainly used in sports heart rate statistics, the old man of community pulse monitoring and other medicine and hygiene fields.
Background technology
Flourish along with medical industry, the traditional Chinese medical science is widely used in worldwide, and the measurement of pulse signal has great application prospect in the tcm clinical practice diagnosis, and the electronic sphygmograph of for this reason developing a low-cost and high-precision has a very big significance.Usually at present, the sensing element of electronic sphygmograph is divided into two classes, and a class is electro-optical pickoff, and another kind of is piezoelectric transducer.Usually the selected material of piezoelectric transducer is the PVDF piezoelectric membrane, and this material is usually very expensive, and its output signal need to be equipped with the sophisticated signal modulate circuit simultaneously, is unfavorable for the application of product.For this reason, find the simple sensing element that substitutes of a kind of low cost and exploitation extremely to be necessary, just in time satisfy this requirement based on the wireless pulses measure instrument apparatus of piezoelectric ceramics buzzing sheet, can also carry out remote wireless transmission simultaneously.
The utility model content
The technical problem that (one) will solve
The technical problems to be solved in the utility model is to provide a kind of wireless pulse meter device based on piezoelectricity singing piece, and it can measure pulse signal quickly and accurately, and carries out wireless transmission and the reception of data.
(2) technical scheme
For solving the problems of the technologies described above, the technical scheme that this utility model adopts is:
A kind of wireless pulse meter device based on piezoelectricity singing piece comprises for piezoelectricity singing piece, signal conditioning circuit, air bag, the pressure transducer of the described gasbag pressure of measurement, major control data acquisition chip, signal transmitting antenna, data receiver chip, receiving terminal power supply, the signal receiving antenna of measuring pulse; Described major control data acquisition chip connects by wireless network with the data receiver chip; Described major control data acquisition chip gathers the output signal of described piezoelectricity singing piece by described signal conditioning circuit; Described major control data acquisition chip is controlled the rated pressure that described air bag produces to be needed; Described major control data acquisition chip gathers the output signal of described pressure transducer; Described data receiver chip receives the pulse signal of described major control data acquisition chip transmission by ZigBee-network; Described major control data acquisition chip connects described signal transmitting antenna, and described data receiver chip connects described signal receiving antenna, and described signal transmitting antenna and signal receiving antenna consist of the hardware interface of described wireless communication.
Wherein, also be provided with micro air pump between described major control data acquisition chip and air bag, described micro air pump is controlled by described major control data acquisition chip the pressure that described air bag is produced and is finely tuned.
Wherein, described major control data acquisition chip also is connected with LCD display and button, the systematic parameter of the described major control data acquisition chip of described button operation, the pulse wave of the real-time display measurement of described LCD display and beat pulse frequency.
Wherein, described major control data acquisition chip is CC2530 major control data acquisition chip, and described data receiver chip is CC2530 data receiver chip.
Wherein, after described signal conditioning circuit carries out filtering, amplification, secondary filtering and secondary amplification to the output signal of described piezoelectricity singing piece, be converted into the voltage signal that changes in the 0-3.3V scope, the voltage signal of output is by AD (AIN0～AIN7) the sampling pin sampling of described CC2530 major control data acquisition chip.
Wherein, described CC2530 data receiver chip is connected with display lamp and serial ports, and described indicating light sign shows transmission status, and described serial ports is connected to host computer and the transmission of data.
Wherein, described piezoelectricity singing piece is two electrode type vicarious circular piezoelectric buzzing sheets, comprise the internal layer of being made by piezoceramic material and the skin of being made by metal material, can push piezoelectricity singing piece during beat pulse, and will produce the Voltage-output of 0.01～0.015V at its two electrode.
Wherein, described CC2530 data receiver chip connects the receiving terminal power supply of promising its power supply.
Wherein, described CC2530 data receiver chip also is connected with the receiving terminal switch.
(3) beneficial effect
This utility model is compared to prior art, has following beneficial effect: this utility model extracts useful signal in order to reduce interfering signal, adopts different filtering and interference protection measure for different interference, can be good at eliminating noise; Piezoelectric ceramics buzzing sheet is a pressure sensor component cheaply, after the hardware and software Filtering Processing to its output signal, output signal can satisfy the needs of actual measurement, therefore utilizing piezoelectric ceramics buzzing sheet is feasible to measuring of pulse signal, add the ZigBee wireless transmission, make the wireless pulse meter device based on piezoelectricity singing piece that commercial application prospect preferably be arranged.
Description of drawings
Fig. 1 is the hardware block diagram of this utility model embodiment.
Fig. 2 is the schematic diagram of the main measurement component of this utility model embodiment.
Fig. 3 is the hardware connection layout of the signal conditioning circuit of this utility model embodiment.
Fig. 4 is the circuit block diagram of the signal conditioning circuit of this utility model embodiment.
Fig. 5 a is the measured waveform one of the pulse signal of this utility model embodiment.
Fig. 5 b is the measured waveform two of the pulse signal of this utility model embodiment.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is described in further detail.Following examples are used for explanation this utility model, but are not used for limiting scope of the present utility model.
As shown in Figure 1, a kind of wireless pulse meter device based on piezoelectricity singing piece comprises for piezoelectricity singing piece, signal conditioning circuit, air bag, the pressure transducer of the described gasbag pressure of measurement, major control data acquisition chip, signal transmitting antenna, data receiver chip, receiving terminal power supply, the signal receiving antenna of measuring pulse; Described major control data acquisition chip connects by wireless network with the data receiver chip; Described major control data acquisition chip gathers the output signal of described piezoelectricity singing piece by described signal conditioning circuit; Described major control data acquisition chip is controlled the rated pressure that described air bag produces to be needed; Described major control data acquisition chip gathers the output signal of described pressure transducer; Described data receiver chip receives the pulse signal of described major control data acquisition chip transmission by ZigBee-network; Described major control data acquisition chip connects described signal transmitting antenna, and described data receiver chip connects described signal receiving antenna, and described signal transmitting antenna and signal receiving antenna consist of the hardware interface of described wireless communication.
Also be provided with micro air pump between described major control data acquisition chip and air bag, described micro air pump is controlled by described major control data acquisition chip the pressure that described air bag is produced and is finely tuned.When pressure is excessive, micro air pump will be exitted, and when pressure was too small, micro air pump will be given airbag aeration.
Described major control data acquisition chip also is connected with LCD display and button, the systematic parameter of the described major control data acquisition chip of described button operation, the pulse wave of the real-time display measurement of described LCD display and beat pulse frequency.
Described major control data acquisition chip is CC2530 major control data acquisition chip, and described data receiver chip is CC2530 data receiver chip.
As Fig. 1, Fig. 3 and shown in Figure 4, after described signal conditioning circuit carries out filtering, amplification, secondary filtering and secondary amplification to the output signal of described piezoelectricity singing piece, be converted into the voltage signal that changes in the 0-3.3V scope, the voltage signal of output is by AD (AIN0～AIN7) the sampling pin sampling of described CC2530 major control data acquisition chip.Here the AIN0 of the CC2530 that selects is as the input of AD sampling, analogue signal during due to sampling exists unstability of base line and other interference, CC2530 major control data acquisition chip needs the data after sampling are made further date processing, data through Digital Signal Processing finally will be passed to CC2530 data receiver chip by the ZigBee wireless network, and CC2530 data receiver chip can be passed to computer or other upper computer software by serial ports.
Described CC2530 data receiver chip is connected with display lamp and serial ports, and described indicating light sign shows transmission status, and when transfer of data was arranged, display lamp will constantly glimmer, and described serial ports is connected to host computer and the transmission of data.
As shown in Figure 2, described piezoelectricity singing piece is two electrode type vicarious circular piezoelectric buzzing sheets, comprise the internal layer of being made by piezoceramic material and the skin of being made by metal material, can push piezoelectricity singing piece during beat pulse, and will produce the Voltage-output of 0.01～0.015V at its two electrode.When piezoelectric ceramics buzzing sheet is applied in DC voltage, produces alternately repeated mechanical bend distortion, thereby produce sound wave in air, be often used as microphone device; Yet piezoelectric ceramic piece also can produce electric wave under the effect of external force, mechanical energy is converted into the signal of telecommunication, and just can be used as a kind of sensor to piezoelectric ceramics buzzing sheet and use this moment.As sensor its have highly sensitive, good reliability, the characteristics such as the life-span is long, and thin thickness is lightweight, and volume is little.Measure faint pulse signal in order to satisfy, through lot of experiment validation, select two electrode type vicarious circular piezoelectric buzzing sheets can better meet measurement requirement, this is wireless, and pulse transducer measurement critical piece buzzing sheet is made by lead zirconate titanate or lead magnesio-niobate piezoceramic material.Two sides at potsherd plates silver electrode, after polarization and burin-in process, then sticks together with latten(-tin) or stainless steel substrates.Usually with finger extruding piezoelectricity singing piece, will produce the Voltage-output of 0.01～0.015V at its two electrode, in the situation that the voltage value of the identical buzzing sheet output of pressure is higher, its sensitivity is also just higher.
This utility model has designed signal conditioning circuit for piezoelectric ceramics buzzing sheet, the mechanical signal of beat pulse is converted into the signal of telecommunication through piezoelectric ceramics buzzing sheet, after amplifying through amplifying circuit of differential type, be admitted in the wave trap of a 50Hz, after the filtering power frequency interference signals, signal is again through a band pass filter circuit, and further other interfering signal of filtering is finally by within the sampling voltage scope of crossing a secondary amplifying circuit signal is amplified to AD converter and output.Piezoelectric ceramics buzzing sheet is when measuring the such small-signal of beat pulse, and its output voltage considers that the noise of various frequencies on the impact of sensor output signal, taked different filterings and braking measure generally below 15mV.Should select 0.1% high-precision metal membrane resistance for using resistance in trap circuit and time constant circuit, electric capacity should select tantalum electric capacity to make building-out capacitor.Should take the measure of hardware notch filter to the 50Hz industrial frequency noise, experiment showed, that the method is better to the inhibition of power frequency interference signals; Electromagnetic signal is suppressed should take holding wire is shielded and design the methods such as 2 rank low pass filters that cut-off frequency is 40Hz.Although it is constant that people's body temperature keeps substantially, the temperature of wrist position skin surface is subjected to impact that ambient temperature changes still very greatly, and the temperature difference of wrist position skin and sensor surface also can bring very large impact to measurement, in order to eliminate the temperature effects noise.Can utilize between human pulse (1Hz left and right) and thermoelectricity noise signal (0.5Hz is following) and have frequency difference, design the high-pass digital filter that lower frequency limit is 0.5Hz, the harmful effect of having avoided temperature effects to bring to pulses measure.
Described CC2530 data receiver chip connects the receiving terminal power supply of promising its power supply.
Described CC2530 data receiver chip also is connected with the receiving terminal switch.
As shown in Fig. 5 a and Fig. 5 b, baseline correction method of the present utility model adopts is a kind of non-linear low pass filter that can fine inhibit signal local edge.Be the selection of filtering window width based on the key of the baseline correction method of medium filtering.If window selects narrowly, useful wave may be by filtering, and namely the part that reduces the wave filter filtering along with window width just increases, and the information of loss has also increased with regard to corresponding; If select widely, window does not only obviously improve treatment effect, and has increased operand, even also might not reach treatment effect, does not reach the purpose that suppresses baseline drift.The sample frequency of selecting due to the CC2530 chip is 100Hz, and the width of the window of median filtering algorithm should be (80～90) Hz as can be known, and window width is 85.Wdata[170] be the pulse original data storage array that gathers, mdata[85] be the storage array of the intermediate value after calculating, new_data is the storages of last samples data, the current deal with data index of i, f_pos is the index position of a legacy data will deleting in by sequence array tmp_data after gathering when a new data.Program can be revised data and update displayed one secondary data after 85 data of every sampling.In order to realize the quicksort to the wdata after new interpolation data, the ranking function that subprogram has realized the wdata sequence is processed in the tmp_wdata sequence.Fig. 5 a can find out that for not using the measured pulse wave of median filtering algorithm there is fluctuation in the baseline of output waveform from Fig. 5 a.Fig. 5 b can find out that for adopting median filtering algorithm pulse wave afterwards the pulse baseline is basically on the same axis.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from this utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (9)
1. the wireless pulse meter device based on piezoelectricity singing piece, is characterized in that: comprise for piezoelectricity singing piece, signal conditioning circuit, air bag, the pressure transducer of the described gasbag pressure of measurement, major control data acquisition chip, signal transmitting antenna, data receiver chip, receiving terminal power supply, the signal receiving antenna of measuring pulse; Described major control data acquisition chip connects by wireless network with the data receiver chip; Described major control data acquisition chip gathers the output signal of described piezoelectricity singing piece by described signal conditioning circuit; Described major control data acquisition chip is controlled the rated pressure that described air bag produces to be needed; Described major control data acquisition chip gathers the output signal of described pressure transducer; Described data receiver chip receives the pulse signal of described major control data acquisition chip transmission by ZigBee-network; Described major control data acquisition chip connects described signal transmitting antenna, and described data receiver chip connects described signal receiving antenna, and described signal transmitting antenna and signal receiving antenna consist of the hardware interface of described wireless communication.
2. the wireless pulse meter device based on piezoelectricity singing piece according to claim 1, is characterized in that: also be provided with micro air pump between described major control data acquisition chip and air bag.
3. the wireless pulse meter device based on piezoelectricity singing piece according to claim 2, it is characterized in that: described major control data acquisition chip also is connected with LCD display and button.
4. the wireless pulse meter device based on piezoelectricity singing piece according to claim 3, it is characterized in that: described major control data acquisition chip is CC2530 major control data acquisition chip, described data receiver chip is CC2530 data receiver chip.
5. the wireless pulse meter device based on piezoelectricity singing piece according to claim 4, it is characterized in that: after described signal conditioning circuit carries out filtering, amplification, secondary filtering and secondary amplification to the output signal of described piezoelectricity singing piece, be converted into the voltage signal that changes in the 0-3.3V scope, the voltage signal of output is by the AD sampling pin sampling of described CC2530 major control data acquisition chip.
6. the wireless pulse meter device based on piezoelectricity singing piece according to claim 5, it is characterized in that: described CC2530 data receiver chip is connected with display lamp and serial ports.
7. the wireless pulse meter device based on piezoelectricity singing piece according to claim 6, it is characterized in that: described piezoelectricity singing piece is two electrode type vicarious circular piezoelectric buzzing sheets, comprise the internal layer of being made by piezoceramic material and the skin of being made by metal material, piezoelectricity singing piece can be pushed during beat pulse, and the Voltage-output of 0.01～0.015V will be produced at its two electrode.
8. the wireless pulse meter device based on piezoelectricity singing piece according to claim 7, is characterized in that: the receiving terminal power supply of promising its power supply of described CC2530 data receiver chip connection.
9. the wireless pulse meter device based on piezoelectricity singing piece according to claim 8, it is characterized in that: described CC2530 data receiver chip also is connected with the receiving terminal switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719558 CN202981972U (en) | 2012-12-21 | 2012-12-21 | Piezoelectric buzzer based wireless pulse device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719558 CN202981972U (en) | 2012-12-21 | 2012-12-21 | Piezoelectric buzzer based wireless pulse device |
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| CN202981972U true CN202981972U (en) | 2013-06-12 |
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| CN 201220719558 Expired - Lifetime CN202981972U (en) | 2012-12-21 | 2012-12-21 | Piezoelectric buzzer based wireless pulse device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103799999A (en) * | 2012-12-21 | 2014-05-21 | 常州先进制造技术研究所 | Wireless pulse meter device based on piezoelectric buzzer |
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- 2012-12-21 CN CN 201220719558 patent/CN202981972U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103799999A (en) * | 2012-12-21 | 2014-05-21 | 常州先进制造技术研究所 | Wireless pulse meter device based on piezoelectric buzzer |
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Granted publication date: 20130612 |