CN105758896A - Water testing pen - Google Patents
Water testing pen Download PDFInfo
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- CN105758896A CN105758896A CN201610305239.9A CN201610305239A CN105758896A CN 105758896 A CN105758896 A CN 105758896A CN 201610305239 A CN201610305239 A CN 201610305239A CN 105758896 A CN105758896 A CN 105758896A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
- G01N27/046—Circuits provided with temperature compensation
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention provides a water testing pen which interacts with a user terminal and comprises a TDS acquisition module, a control module and a short distance wireless communication module, wherein the TDS acquisition module is used for transmitting corresponding output frequency of a solution to be tested to the control module so as to enable the control module to process the output frequency; the control module is used for processing the output frequency so as to obtain a value of TDS, and used for transmitting the value of TDS to the short distance wireless communication module. The short distance wireless communication module is used for transmitting the value of the TDS to the user terminal so as to be checked by a user. Compared with a conventional water testing pen, the water testing pen provided by the embodiment of the invention is beneficial for the user to intuitively understand the quality of tested water.
Description
Technical field
The present invention relates to fields of measurement, in particular to a kind of Pen type humidometer.
Background technology
Water is Source of life, and the mankind be unable to do without water in productive life.In earth hydrosphere, available freshwater resources just only have a part for river, fresh water lake and subsoil water, less than the 1% of total amount.Nowadays along with the raising of socioeconomic development, the progress of science and living standards of the people, environmental pollution is increasingly severe, and wherein, water environment pollution is the most serious.In today of water resource worsening shortages, quality problem receives and increasingly focuses on, and therefore water quality carries out test and can make our water conservation better.
And existing Pen type humidometer often needs to go artificially to check after being measured and obtains the reading that this Pen type humidometer is particularly shown, owing to reading and water standard corresponding to reading are often more complicated, it is unfavorable for that user understands the water quality of measured water intuitively.
Summary of the invention
In view of this, a kind of Pen type humidometer is embodiments provided, to improve the problem that existing Pen type humidometer is unfavorable for that user understands the water quality of measured water intuitively.
For achieving the above object, embodiments provide a kind of Pen type humidometer, interact with user terminal, Pen type humidometer includes: TDS acquisition module, control module, short-range wireless communication module, described TDS acquisition module and short-range wireless communication module are all connected with described control module, output frequency corresponding for solution to be measured is sent to described TDS acquisition module described control module so that described control module processes, the value of the TDS that described control module obtains after being processed by described output frequency is sent to described user terminal by described short-range wireless communication module.
Preferably, above-mentioned Pen type humidometer, described TDS acquisition module includes multi-resonant oscillating circuit, described multi-resonant oscillating circuit includes probe, described probe contacts with solution to be measured, the equivalent resistance that described multi-resonant oscillating circuit is constituted with probe according to described solution to be measured, it is thus achieved that the output frequency corresponding with described solution to be measured, described output frequency is sent to described control module by described TDS acquisition module.
Described probe and solution to be measured may be constructed an equivalent resistance, multi-resonant oscillating circuit can obtain the output frequency of this equivalent resistance, namely being equivalent to obtain the output frequency of solution to be measured and probe, then TDS acquisition module can be sent to control module for controlling resume module output frequency.
Preferably, above-mentioned Pen type humidometer, described control module receives described output frequency and obtains the value of TDS according to the value of predetermined capacitance in the long-pending and described multi-resonant oscillating circuit in effective cross section of described output frequency, the effective length of described probe, described probe.
Specifically, the value that described control module can be amassed according to the effective cross section of output frequency, the effective length of probe, probe and in multi-resonant oscillating circuit, the value of predetermined capacitance obtains TDS.Wherein, the effective length of probe, probe effective cross section is long-pending and in multi-resonant oscillating circuit, the value of predetermined capacitance is known, therefore the value of TDS is only relevant with output frequency.So the value of TDS just can be directly obtained after acquisition output frequency.
Preferably, above-mentioned Pen type humidometer, described control module obtains the value of TDS according to TDS=(0.55～0.70) * f*L*C/0.722*S, and wherein, f is the output frequency corresponding with described solution to be measured；L is the effective length of described probe；C is the value of predetermined capacitance in described multi-resonant oscillating circuit；The effective cross section that S is described probe is amassed.
Specifically can obtain the value of TDS according to above-mentioned formula, the corresponding formula of typing can so that controlling module to calculate the value of TDS according to the output frequency that TDS acquisition module obtains in the control module.
Preferably, above-mentioned Pen type humidometer, described multi-resonant oscillating circuit also includes intervalometer, and the pin of described intervalometer is connected with described probe.
Specifically, described intervalometer can be 555 intervalometers, DIS pin and the THR pin of 555 intervalometers can be connected with probe, and probe and solution to be measured can form equivalent resistance, therefore 555 intervalometers and include the multi-resonant oscillating circuit of intervalometer and can obtain the output frequency of this equivalent resistance.
Preferably, above-mentioned Pen type humidometer, described control module includes A/D converting unit, and the value of described TDS is carried out A/D conversion by described A/D converting unit, and the value of the TDS after conversion is sent to described short-range wireless communication module.
Described control module can obtain the value of TDS according to output frequency, after the value of TDS is carried out A/D conversion by the A/D converting unit in module by described control module, it is possible to the value after conversion is sent to described short-range wireless communication module.
A/D converting unit analog quantity can be converted to digital quantity to facilitate user that digital quantity is understood more intuitively.
Preferably, above-mentioned Pen type humidometer, also include temperature collect module, described temperature collect module is connected with described control module, the temperature data gathered is sent to described control module by described temperature collect module, described control module is transferred to described short-range wireless communication module after the temperature data that described temperature collect module gathers is processed, the data received are sent to described user terminal by described short-range wireless communication module.
Specifically can also including temperature collect module, the temperature data collected is sent to control module by described temperature collect module, controls module and the temperature of temperature collect module collection is processed and is transferred to short-range wireless communication module.
Preferably, above-mentioned Pen type humidometer, described temperature collect module includes DS18B20 temperature sensor.
Temperature collect module can be specifically DS18B20 temperature sensor, and this temperature collect module can also is that the temperature sensor of other models certainly, and it is limitation of the present invention that the particular type of temperature collect module should not be construed.
Preferably, above-mentioned Pen type humidometer, described control module includes MSP430G2553 single-chip microcomputer.
Specifically, described control module can be specifically MSP430G2553 single-chip microcomputer, and certainly, described control module can also be other kinds of single-chip microcomputer, for instance STC89C52 single-chip microcomputer, and it is limitation of the present invention that the particular type of described control module should not be construed.
Preferably, above-mentioned Pen type humidometer, described short-range wireless communication module is bluetooth communication.
Specifically, described short-range wireless communication module can also be other communication module such as ZigBee module, thus the particular type of short-range wireless communication module to should not be construed be limitation of the present invention.
Pen type humidometer provided by the invention and user terminal interact, and include TDS acquisition module, control module, short-range wireless communication module.Output frequency corresponding for solution to be measured is sent to control module by TDS acquisition module, so that described control module processes.Control to obtain after output frequency is processed by module the value of TDS, and the value of TDS is transferred to short-range wireless communication module.The value of TDS is sent to user terminal so that user checks by short-range wireless communication module.Compared with existing Pen type humidometer, the Pen type humidometer that the embodiment of the present invention provides is conducive to user to understand the water quality of measured water intuitively.
Accompanying drawing explanation
For the clearer explanation embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structured flowchart of the Pen type humidometer that the embodiment of the present invention provides；
Fig. 2 is the circuit diagram of the TDS acquisition module that the embodiment of the present invention provides；
Fig. 3 is the circuit diagram of the temperature collect module that the embodiment of the present invention provides；
The surface chart of the user terminal that Fig. 4 provides for the embodiment of the present invention.
Accompanying drawing labelling is as follows:
Pen type humidometer 100；TDS acquisition module 110；Multi-resonant oscillating circuit 111；Temperature collect module 120；Control module 130；A/D converting unit 131；Short-range wireless communication module 140；User terminal 200.
Detailed description of the invention
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Hereinafter the detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit claimed the scope of the present invention, but is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
Embodiment
Refer to Fig. 1, Fig. 1 illustrates a kind of Pen type humidometer 100 that the embodiment of the present invention provides, this Pen type humidometer 100 can interact with user terminal 200, it includes TDS acquisition module 110, temperature collect module 120, controls module 130 and short-range wireless communication module 140, TDS acquisition module 110 and temperature collect module 120 are all connected with control module 130, control module 130 and are also connected with short-range wireless communication module 140.
TDS acquisition module 110 includes multi-resonant oscillating circuit 111, and details refer to Fig. 2, and multi-resonant oscillating circuit 111 includes 555 intervalometer U1 and two probe (not shown).The DIS pin of 555 intervalometer U1 is connected by a probe in pricking with needle J1 and two piece probe, and the THR pin of 555 intervalometer U1 is connected by another root probe in pricking with needle J1 and two piece probe.The THR pin of 555 intervalometer U1 is connected with the Cvolt pin of 555 intervalometer U1 after sequentially passing through electric capacity C4, electric capacity C3 by wire；Position between the THR pin of 555 intervalometer U1 with electric capacity C4 and pricking with needle J1 is drawn the TRIG pin of a wire and 555 intervalometer U1 and is connected.After wire between the GND pin elder generation of 555 intervalometer U1 with electric capacity C3 and electric capacity C4 is connected, then ground connection.
The Q pin of 555 intervalometer U1 is connected with the base stage of audion Q1, and the emitter stage of audion Q1 is connected with the DIS pin of 555 intervalometer U1 and first pin of pricking with needle J1 respectively, and the colelctor electrode of audion Q1 is then connected with the R pin of 555 intervalometer U1.The VCC pin of 555 intervalometer U1 is then connected with power supply VCC, the R pin of 555 intervalometer U1 and the colelctor electrode of audion Q1 respectively.
Temperature collect module 120 includes DS18B20 temperature sensor and pull-up resistor R1, and details refer to Fig. 3.The Vcc pin of DS18B20 connects power Vcc, the GND pin ground connection of DS18B20, and the DA pin of DS18B20 is connected with power supply VCC by pull-up resistor R1.
It is appreciated that temperature collect module 120 can be DS18B20 temperature sensor, it is also possible to for other temperature sensor, it is limitation of the present invention that the particular type of temperature collect module 120 should not be construed.
Control module 130 includes A/D converting unit 131, A/D converting unit 131 and is connected with the Q pin of 555 intervalometer U1 in multi-resonant oscillating circuit 111；Control module 130 to be also connected with temperature collect module 120.
Controlling module 130 and be specifically as follows MSP430G2553 single-chip microcomputer, the A/D interface of MSP430G2553 single-chip microcomputer can be connected with the Q pin of 555 intervalometer U1, and the P1.7 pin of MSP430G2553 single-chip microcomputer is connected with the DA pin of DS18B20.
Short-range wireless communication module 140 is connected with controlling module 130.
Short-range wireless communication module 140 is specifically as follows bluetooth communication.Bluetooth communication for being BT05 bluetooth module, can adopt American TI Company CC2541 chip, configures 256Kb space, it then follows V4.0BLE Bluetooth specification.This bluetooth module supports AT instruction, user can the parameter such as changed serial port baud rate, device name, pairing password as required, use flexibly.
Described short-range wireless communication module 140 can also be other communication module such as ZigBee module, thus the particular type of short-range wireless communication module 140 to should not be construed be limitation of the present invention.
The operation principle of the Pen type humidometer 100 that the embodiment of the present invention provides is: be positioned in solution to be measured by two above-mentioned probes, multi-resonant oscillating circuit 111 obtains the output frequency corresponding with solution to be measured according to solution to be measured with the equivalent resistance that probe is constituted, and then the output frequency obtained is sent to controlling module 130 by TDS acquisition module 110；Control the value that module 130 can be amassed and in multi-resonant oscillating circuit 111, the value of predetermined capacitance obtains TDS according to the effective cross section of output frequency, the effective length of probe, probe.
Specifically, it is possible to obtain the value of TDS according to TDS=(0.55～0.70) * f*L*C/0.722*S, wherein, f is the output frequency corresponding with described solution to be measured；L is the effective length of described probe；C is the value of predetermined capacitance in described multi-resonant oscillating circuit 111, the value being specially in Fig. 2 electric capacity C4；The effective cross section that S is described probe is amassed.
The conductive capability of conductor is relevant with the length of the character of conductor and conductor and cross-sectional area, and relation is:Wherein R is resistance, and L is the effective length of conductor, and the effective cross section that S is conductor is amassed, and ρ is resistivity.And the relation of conductance is:Electrical conductivity K is the inverse of resistivity, so G=KS/L.
Owing to there is dependency relation significantly between TDS and electrical conductivity K, the relation between dissolved solid and conductance can use the estimation of this empirical equation: TDS=(0.55～0.70) Ks.Wherein, electrical conductivity of water when Ks is 25 DEG C.
TDS=(0.55～0.70) * f*L*C/0.722*S can be obtained by f=0.722/CR, ρ=RS/L=1/K and TDS=(0.55～0.70) Ks tri-formula simultaneous.Wherein f is output frequency, and C is the value of predetermined capacitance in multi-resonant oscillating circuit 111, and R is resistance, and ρ is resistivity, and L is the effective length of conductor, and the effective cross section that S is conductor is amassed, electrical conductivity of water when Ks is 25 DEG C.
Therefore, by TDS=(0.55～0.70) * f*L*C/0.722*S it can be seen that the value of TDS can be obtained according to the output frequency f of solution to be measured.
The electrical conductivity of solution to be measured is greatly influenced by temperature, and when solution temperature raises, ion heat is run and accelerated, and conductive capability increases, and electrical conductivity of solution increases；Vice versa.So temperature compensation can be adopted, the electrical conductivity of this solution when the solution of arbitrary temp being carried out temperature-compensating to compensate to fiducial temperature 25 DEG C.
When the actual temperature of solution to be measured is about 25 DEG C, it is possible to use Ks=Kt/ [0.22t+0.45)] obtains Ks, the electrical conductivity of solution when wherein Ks is 25 DEG C, Kt be t DEG C at the electrical conductivity of solution, t is the temperature of detected solution.
When the actual temperature distance 25 DEG C of solution to be measured deviates bigger, it should being calculated according to different temperature correction facotors, concrete temperature-compensating formula is as follows:
Ks=Kt/ (0.00169t+0.5583) 1 DEG C≤t≤10 DEG C
Ks=Kt/ (0.018t+0.5473) 10 DEG C≤t≤20 DEG C
Ks=Kt/ (0.00189t+0.5281) 20 DEG C≤t≤30 DEG C
Ks=Kt/ (0.022t+0.45) t≤1 DEG C or t > 30 DEG C
The electrical conductivity of solution when wherein Ks is 25 DEG C, Kt be t DEG C at the electrical conductivity of solution, t is the temperature of detected solution.
Above-mentioned temperature-compensating formula all can be stored in control module 130, temperature collect module 120 can obtain the actual temperature of solution to be measured and the actual temperature of acquisition is sent to described control module 130, described control module 130 according to above-mentioned actual temperature and be stored in control module 130 temperature-compensating formula obtain 25 DEG C time solution to be measured electrical conductivity.
Referring to the surface chart of the user terminal 200 that Fig. 4, Fig. 4 illustrate that the embodiment of the present invention provides, short-range wireless communication module 140 is by the TDS value transmission that obtains to user terminal 200, and user terminal 200 receives and shows TDS value.Warm tip therein may indicate that the quality of the water corresponding to TDS value, for instance, the prompting of " water quality is good, capable of direct drinking " when TDS value is 13.0, can be shown.
Short-range wireless communication module 140 is specifically as follows bluetooth communication.When this Pen type humidometer 100 specifically used and the user terminal 200 mutual with Pen type humidometer 100, it is possible to testing liquid is put in one end that Pen type humidometer 100 has probe, so that probe is fully immersed in liquid, and open this Pen type humidometer 100.Then interface as shown in Figure 4 is entered at user terminal 200, it is possible to make user terminal 200 be connected with this Pen type humidometer 100 by the mode of bluetooth.After a certain time, Pen type humidometer 100 the TDS value of test liquid is transferred to user terminal 200 such as bluetooth communication, user terminal 200 receives and shows this TDS value.
If it is desired, the water quality such as outdoor river, lake can be detected by this Pen type humidometer 100.It is limitation of the present invention that the test correspondence of Pen type humidometer 100 should not be construed.
Pen type humidometer 100 provided by the invention interacts with user terminal 200, and includes TDS acquisition module 110, controls module 130, short-range wireless communication module 140.Output frequency corresponding for solution to be measured is sent to control module 130 by TDS acquisition module 110, so that described control module 130 processes.Control to obtain after output frequency is processed by module 130 value of TDS, and the value of TDS is transferred to short-range wireless communication module 140.The value of TDS is sent to user terminal 200 so that user checks by short-range wireless communication module 140.Compared with existing Pen type humidometer 100, the Pen type humidometer 100 that the embodiment of the present invention provides is conducive to user to understand the water quality of measured water intuitively.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, above in conjunction with the accompanying drawing in the embodiment of the present invention, carry out describing clearly and completely to the technical scheme in the embodiment of the present invention, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Generally can with various different configurations arrange and design with the assembly of the embodiment of the present invention that illustrate described in accompanying drawing herein.
Therefore, the detailed description of the above embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed the scope of the present invention, but is merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
It should also be noted that similar label and letter below figure represent similar terms, therefore, once a certain Xiang Yi accompanying drawing is defined, then it need not be carried out definition further and explain in accompanying drawing subsequently.
In describing the invention, it should be noted that, the orientation of instruction or the term of position relationship are based on orientation shown in the drawings or position relationship, or this invention product orientation usually put or position relationship when using, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication method or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly；Can be mechanically connected, it is also possible to be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals.For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
Claims (10)
1. a Pen type humidometer, it is characterized in that, interact with user terminal, Pen type humidometer includes: TDS acquisition module, control module, short-range wireless communication module, described TDS acquisition module and short-range wireless communication module are all connected with described control module, output frequency corresponding for solution to be measured is sent to described TDS acquisition module described control module so that described control module processes, and the value of the TDS that described control module obtains after being processed by described output frequency is sent to described user terminal by described short-range wireless communication module.
2. Pen type humidometer according to claim 1, it is characterized in that, described TDS acquisition module includes multi-resonant oscillating circuit, described multi-resonant oscillating circuit includes probe, described probe contacts with solution to be measured, the equivalent resistance that described multi-resonant oscillating circuit is constituted with probe according to described solution to be measured, it is thus achieved that the output frequency corresponding with described solution to be measured, described output frequency is sent to described control module by described TDS acquisition module.
3. Pen type humidometer according to claim 2, it is characterized in that, described control module receives described output frequency and obtains the value of TDS according to the value of predetermined capacitance in the long-pending and described multi-resonant oscillating circuit in effective cross section of described output frequency, the effective length of described probe, described probe.
4. Pen type humidometer according to claim 3, it is characterised in that described control module obtains the value of TDS according to TDS=(0.55～0.70) * f*L*C/0.722*S, and wherein, f is the output frequency corresponding with described solution to be measured；L is the effective length of described probe；C is the value of predetermined capacitance in described multi-resonant oscillating circuit；The effective cross section that S is described probe is amassed.
5. Pen type humidometer according to claim 2, it is characterised in that described multi-resonant oscillating circuit also includes intervalometer, and the pin of described intervalometer is connected with described probe.
6. Pen type humidometer according to claim 1, it is characterised in that described control module includes A/D converting unit, the value of described TDS is carried out A/D conversion by described A/D converting unit, and the value of the TDS after conversion is sent to described short-range wireless communication module.
7. Pen type humidometer according to claim 1, it is characterized in that, also include temperature collect module, described temperature collect module is connected with described control module, the temperature data gathered is sent to described control module by described temperature collect module, described control module is transferred to described short-range wireless communication module after the temperature data that described temperature collect module gathers is processed, the data received are sent to described user terminal by described short-range wireless communication module.
8. Pen type humidometer according to claim 7, it is characterised in that described temperature collect module includes DS18B20 temperature sensor.
9. Pen type humidometer according to claim 1, it is characterised in that described control module includes MSP430G2553 single-chip microcomputer.
10. Pen type humidometer according to claim 1, it is characterised in that described short-range wireless communication module is bluetooth communication.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610305239.9A CN105758896A (en) | 2016-05-06 | 2016-05-06 | Water testing pen |
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| CN201610305239.9A CN105758896A (en) | 2016-05-06 | 2016-05-06 | Water testing pen |
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Cited By (5)
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| CN106053553A (en) * | 2016-07-26 | 2016-10-26 | 佛山科学技术学院 | Water quality monitor |
| CN106841324A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of SCM Based TDS water quality testing meters |
| CN109211981A (en) * | 2018-09-05 | 2019-01-15 | 广东点球电子科技有限公司 | The probe calibration method, apparatus and TDS detector of TDS detector |
| CN110208479A (en) * | 2019-06-21 | 2019-09-06 | 安徽莱茵河科创服务有限公司 | A kind of data management system for water quality testing data |
| CN112994757A (en) * | 2021-02-03 | 2021-06-18 | 上海三信仪表厂 | Intelligent test pen Bluetooth data transmission equipment |
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