CN202693478U - Quick detecting equipment for quality parameters of domestic drinking water - Google Patents
Quick detecting equipment for quality parameters of domestic drinking water Download PDFInfo
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- CN202693478U CN202693478U CN 201220267698 CN201220267698U CN202693478U CN 202693478 U CN202693478 U CN 202693478U CN 201220267698 CN201220267698 CN 201220267698 CN 201220267698 U CN201220267698 U CN 201220267698U CN 202693478 U CN202693478 U CN 202693478U
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Abstract
The utility model discloses quick detecting equipment for quality parameters of domestic drinking water. Test paper and a color sensor are combined, in a sealed completely dark environment, a stable light source emits white light which is radiated to tested test paper, the test paper reflects the light of the color of the test paper to the color sensor, the color sensor converts a light signal into pulse number, and the pulse number is output to a single chip and is processed by the single chip to detect the concentration of chloride ions and pH value of water. Voltage-dividing, following and amplifying circuits are adopted, water is converted into a variable resistor by an electrode, voltage analog quantity is converted into digital value by an analog to digital converter, the digital value is transmitted to the single chip to be processed, and the electric conductivity of the water is detected. The equipment is used for detecting the domestic drinking water, and has the functions of detecting a plurality of parameters, such as concentration of chloride ions, pH value and electric conductivity. The equipment is simple in circuit, intelligent and precise.
Description
Technical field
The utility model relates to the water quality detection field, particularly to the detection of quality of household drinking water, is a kind of fast detecting equipment of the many kinds of parameters for detection of comprising chlorine ion concentration, pH value, conductivity in the household drinking water specifically.
Background technology
Along with the development of society, people more and more pay attention to the health of potable water, and present people exist certain doubt to water quality is whether qualified.The equipment that can be used in the market family's water quality detection almost only has one-parameter test solution box or detecting pen, and multi-functional water quality testing meter mostly is the Laboratory Instruments of large-scale costliness, is used for laboratory study or some aquaculture.The water quality testing meter that is used for aquaculture is to adopt spectrophotometric photoelectric colorimetry principle, use reagent, water sample is put into behind the reagent reacting a few minutes reading, numeral shows ammonia nitrogen, dissolved oxygen DO, nitrite equivalence, reagent is packaged as dropping bottle or vacuum packaging, is applicable to laboratory or field condition quantitative measurment.The defective that exists is detection of complex, and instrument is expensive.
The detection method of chlorion all is to use the chemistry titration method in the potable water at present, drips nitric acid in test solution, if having precipitation or gas to generate, then continue to be added drop-wise to nothing precipitation and gas and generate, if there is precipitation to generate, and then filtration.In solution, splash into excessive silver nitrate until generate without precipitation again.Filter.Oven dry gained precipitation, recording the precipitation quality is the quality of AgCl, and then can obtain quality and the amount of substance of the chlorine element contained in the waste water of getting, and also is quality and the amount of substance of chlorion.The method is only applicable to the laboratory and uses, and testing process is very complicated.
The detection method of pH value generally is to use the PH test paper, with the standard color comparison card contrast, draws pH value again.The method adopts eye recognition to have certain error, and also needs the contrast ratio colour atla, and is comparatively complicated.
The measurement of conductivity is the conductivity measurement of solution normally.The resistivity of solid conductor can be measured by Ohm law and the law of resistance.The measurement of electrolyte solution conductivity generally adopts AC signal to act on two battery lead plates of conductance cell, is led G and is tried to achieve the conductivityσ by the electricity between the cell constant of conductometric vessel K that measures and two battery lead plates.The most frequently used instrument has constant regulator, temperature coefficient regulator and Automatic Temperature Compensator, is comprised of conductance cell and temperature sensor in the primary instrument field, can directly measure the electrolyte solution conductivity.
Based on above-mentioned present situation, research portable family rapid water quality detecting device in order to can test rapidly and accurately and timely Drinking Water, is estimated the security of potable water, has become the study hotspot of generally paying attention to both at home and abroad.
The utility model content
The purpose of this utility model is to provide a kind of quality of household drinking water multiparameter fast detecting equipment, makes small-sized detecting instrument can come into general family, detects the safety of potable water, allows people's ground drinking public water supply of feeling more relieved.
The technical solution of the utility model is as follows:
A kind of quality of household drinking water multiparameter fast detecting equipment comprises shell, is provided with T slot type drawer, the guide rail of T slot type drawer below and the cam post in the middle of the guide rail in the described shell; Offer porosely on the described shell, the end of T slot type drawer and cam post is arranged on place, described hole, and T slot type drawer and cam post can be extracted out from described hole along guide rail movement; The section radius of described cam post does not wait, but the bottom of described cam post and T slot type drawer fits tightly and axial rotation; The top of T slot type drawer has confined chamber in the described shell, and the confined chamber top has the polylith circuit board, comprises at least LED lamp array and color sensor on the circuit board; Has display window on the corresponding shell of described circuit board; Be provided with in the described shell can extract out put liquid box and conductance electrode, an end of conductance electrode stretches out shell, the other end stretches into to be put in the liquid box.
Useful technique effect of the present utility model is:
The utility model is used for family's water quality detection.Based on household drinking water safety, according to the impact size of water quality factors on health, mainly locate the detection of chlorine ion concentration, pH value, conductivity three aspects:.The measuring ability of many kinds of parameters is integrated in one, chlorine detection ion concentration and pH value are that test paper and color sensor are combined, sampling obtains the corresponding relation of rgb value and pH value or chlorine ion concentration value by experiment, set up respectively the colour atla storehouse of pH value and chlorion, table look-up by the rgb value that detection obtains, employing minimum value approximatioss obtains detecting pH value or the chlorine ion concentration of test solution, and shows the result with charactron.Detecting conductivity is to utilize bleeder circuit, adopts conductance electrode, and water is converted to the power transformation resistance, obtains magnitude of voltage, and voltage analog is converted to digital quantity, processes and output signal through single-chip microcomputer again, detects electrical conductivity of water.
The testing conditions of color-based sensor, design is suitable for placing confined space and the drawer of five color sensors and test paper adapted, chlorion test paper and PH test paper share a groove, and five lattice confined chambers are corresponding with the chlorion test paper, and make it airtight better with the cam post structure.Instrument is simple and practical, and accuracy of detection is high.National standard according to " drinking water sanitary standard ": the requirement to chlorine ion concentration is decided to be less than 250mg/L, if surpass this value, does not meet drinking water standard just assert this water quality, and accuracy of detection is 5mg/L; The health scope of drinking to the potable water pH value is decided to be 6.5～8.5, and accuracy of detection is 0.5; Aspect conductivity, utilize specific conductance electrode, through demarcating, electrolytic cell constant K=1, then according to the safe range 200 to 800us/cm of conductivity, precision is 20us/cm, according to formula R=ρ * L/S=k/ σ, the scope that conductivity is converted into resistance is 1250 ohm to 5000 ohm.The detection operating process is simple, and intelligence is accurate, and circuit is simple, detects sensitive, with low cost.
The utility model not only is fit to water quality detection, also can use in any test macro that change color arranged, as long as gather enough normal datas for tabling look-up before experiment.
Description of drawings
Fig. 1 is general principles block diagram of the present utility model.
Fig. 2 is the external structure of the utility model checkout equipment.
Fig. 3 is the cut-away view of the utility model checkout equipment.
Fig. 4 is single chip circuit figure.
Fig. 5 is LED lamp antenna array control circuit diagram.
Fig. 6 is color sensor control circuit figure.
Fig. 7 is the pin function figure of color sensor.
Fig. 8 is the combination function figure of pin S0, S1 and S2, the S3 of color sensor.
Fig. 9 is color sensor sheet selected control circuit diagram processed.
Figure 10 is display board circuit figure.
Figure 11 is charactron and LED lamp position selected control circuit diagram processed.
Figure 12 is charactron and LED lamp section selected control circuit diagram processed.
Figure 13 is electrical conductivity measurement circuit figure.
Figure 14 is A/D change-over circuit figure.
Figure 15 is that 24V turns 5V voltage transitions and mu balanced circuit figure.
Figure 16 is lithium battery switch voltage-stabilizing circuit figure.
The program circuit synoptic diagram that Figure 17 is total.
Figure 18 chlorion detects the subroutine schematic flow sheet.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Theory diagram of the present utility model as shown in Figure 1.The utility model comprises two parts function, the one, and for the detection of test paper, the 2nd, for the detection of conductivity.
To the test section of test paper, adopt test paper and color sensor to combine to realize.In the present embodiment take the detection of chlorion test paper and pH test paper as example.What the chlorion test paper adopted is German import MN chloride test bar.What the pH test paper adopted is the extensive test paper of PH1-14.The chlorion test paper presents regular change color with the pH test paper because of chlorine ion concentrations different in the potable water, potential of hydrogen, carry out color detection with color sensor, offer an explanation out the variation of color, the pulse of output different frequency, received and process by single-chip microcomputer, again chlorine ion concentration value, the pH value that records is shown on the charactron.The chlorion test paper has five colour developing grid, therefore adopts five grid of five sensors and this corresponding; The pH test paper only needs the corresponding work of two sensors to get final product, and two sensors detect center and the edge of pH test paper respectively, with the impact of color difference eliminating.Under airtight complete black environment, stabilized light source (LED lamp array) sends white light, shines on the above-mentioned test paper, and test paper reflects the light of himself color to color sensor.The light of different colours, wavelength is different, and frequency is also different, and color sensor is converted to umber of pulse with light signal, and single-chip microcomputer is passed in output again.Single-chip microcomputer is processed, and calls the database that the standard reagent experiment is set up, and adopts minimum value approximatioss algorithm, and numerical value is shown to charactron.
The closed black color space is the key of test paper color detection, because mainly expect diffusing of test paper change color place in experimentation, in order to get rid of the impact of external light source, test environment must be finished every the airtight little space of light fully.Data measured is unstable under non-closed environment, and the design of confined space makes experimental data more stable.
Stable white bright light source is the key of test paper color detection.Light source is the required source signal of test paper color measuring, requires light source colour stable, and namely to send the frequency spectrum of light beam be stable to light source.Because what the color detection device adopted is the RGB color sensor, its spectrum width of light source that therefore adopts should comprise most visible light wave ranges at least.In order to guarantee measuring accuracy, reduce the systematic error of instrument, the homogeneity of measuring beam light intensity on the sensor receiving plane there is certain requirement, but because the light receiving surface of sensor is very little, 1.15 * 1.15mm only arranged
2, uniformity of light is content with very little on the measurement face.Therefore, for the light source of system, what emphasis was considered is the colour stability of light source.
Test section to conductivity, adopt sensor (platinum black conductance electrode) to test the fluid to be measured of putting in the liquid box, the conductivity testing circuit that what adopt is dividing potential drop, follow, amplify, with electrode water is converted to the power transformation resistance, and with A/D converter voltage analog is converted to digital quantity, processed and output signal by single-chip microcomputer again, shown respectively by three LED lamps again, healthy water is green light, and drinkable water is amber light, and non-drinkable water is red light.
Based on checkout equipment such as Fig. 2, shown in Figure 3 of the utility model principle made, its external structure is illustrated by Fig. 2, and inner structure is illustrated by Fig. 3.This checkout equipment comprises shell 1, is equiped with the guide rail 5 of T slot type drawer 2, T slot type drawer 2 belows and the cam post 3 in the middle of the guide rail 5 in the shell 1.Offer porosely on the shell 1, T slot type drawer 2 and cam post 3 can be extracted out from this hole.T slot type drawer 2 is used for placing detected test paper, and the effect of guide rail 5 is to make 2 slips of T slot type drawer smooth, and the cross section of cam post 3 is irregular types, after being rotated, it T slot type drawer 2 of its top can be improved or decline, thus regulating seal property.The top of T slot type drawer 2 has confined chamber 8 in the shell 1, and confined chamber 8 tops have the polylith circuit board, comprises at least LED lamp array 9 and color sensor 10 on the circuit board.Under confined chamber 8 complete black environment, LED lamp array 9 sends white light to tested test paper, and test paper reflects the light of himself color to color sensor 10, carries out color detection.Have display window 7 on the corresponding shell 1 of circuit board, be used for showing test results.In addition, also have in the shell 1 can extract out put liquid box 4 and conductance electrode 6, an end of conductance electrode 6 stretches out shell 1, the other end stretches into to be put in the liquid box 4.Put liquid box 4 with extracting out after carrying on the conductance electrode 6, putting liquid box 4 interior placement fluids to be measured, then push and put liquid box 4, transfer conductance electrode 6, the conductivity by 6 pairs of fluids to be measured of conductance electrode detects.
Circuit board in the utility model checkout equipment is comprised of four circuit boards (mainboard, display board, sensor board, led array plate).Divide by circuit function, comprise that then charactron and LED lamp section selected control circuit processed, the electrical conductivity measurement circuit of Figure 13, the A/D change-over circuit of Figure 14, the lithium battery switch voltage-stabilizing circuit of Figure 15 and the 24V of Figure 16 of the charactron of display board circuit, Figure 11 of color sensor sheet selected control circuit processed, Figure 10 of color sensor control circuit, Fig. 9 of led array control circuit, Fig. 6 of single chip circuit, Fig. 5 of Fig. 4 and LED lamp position selected control circuit processed, Figure 12 turns 5V voltage transitions and mu balanced circuit.
Below introduce in detail each circuit theory diagrams:
Single chip circuit as shown in Figure 4, the model that single-chip microcomputer in the present embodiment is selected is 80C52, it has following standard feature: 8k bytes Flash, 256 byte RAM, 32 I/O mouth lines, WatchDog Timer, 2 data pointers, three 16 bit timing device/counters, 2 grades of interrupt structures of one 6 vector, crystal oscillator and clock circuit in the full duplex serial port, sheet.Can be down to the operation of 0Hz static logic, support 2 kinds of softwares can select energy-saving mode.Under the idle pulley, CPU quits work, and allows RAM, timer/counter, serial ports, interruption to work on.Under the power down protection mode, the RAM content is saved, and oscillator is frozen, and all work of single-chip microcomputer stop, until next the interruption or hardware reset.Its pin assignment is seen Fig. 3.In addition, single-chip microcomputer also can be selected the models such as AT89S51, AT89S52.
LED lamp antenna array control circuit is composed in parallel by 5 LED lamps and divider resistance circuit as shown in Figure 5.The LED lamp antenna array control circuit of Fig. 5 is directly by the button S5 gauge tap in the display board circuit of Figure 10, and when pushing button S5, the LED lamp array among Fig. 5 is worked.
The color sensor control circuit as shown in Figure 6, the model that color sensor is selected in the present embodiment is TCS230, it is that the colorama able to programme released of TAOS company is to the converter of frequency.It is integrated in configurable silicon photoelectric diode and current frequency converter on the single cmos circuit, simultaneously one chip also integrated three kinds of light filters of RGB (RGB), be industry first RGB color sensor of digital compatibility interface is arranged.The output signal of TCS230 is digital quantity, can drive TTL or the input of CMOS logic of standard, therefore can directly be connected with microprocessor or other logical circuit.Because output is digital quantity, and can realize the conversion accuracy of each chrominance channel more than 10, thereby no longer needs the A/D change-over circuit, makes circuit become simpler.In addition, color sensor also can be selected the models such as TCS3200.
The pin function figure of color sensor TCS230 sees Fig. 7, and its inside function is equivalent to a photodiode and adds an electric current to the converter of frequency.Pin S0, the S1 of color sensor TCS230 and the combination function of S2, S3 are seen Fig. 8, and the high-low level combination (H is that high level, L are low level) of pin S0, S1 determines the output frequency demarcation.Select the output frequency of S0, S1 overall height 100% under the application of general case, when some single-chip microcomputer output frequency is too high, waveform is too intensive when too many to be counted, can select 2% or 20% output frequency.The combination of the high-low level of pin S2, S3 determines filter type, is respectively R, G, B three look filtering, finishes the test of R, G, B three looks for three times in the practical application time-division.
The color sensor control circuit of Fig. 6 comes the control strip choosing by the latch 74H573 in the color sensor sheet selected control circuit processed of Fig. 9, come gauge tap (in the present embodiment, the S1～S4 among Figure 10 is respectively the gauge tap of white balance, chlorion, ph value, conductivity test function) by the button S2 in the display board circuit of Figure 10.For example when pushing button S2, it is high level that the latch 74H573 among Fig. 9 makes the X1 pin, and then sheet selects the sensor J1 work among Fig. 6, by that analogy.Sensor J1～J5 processes through single-chip microcomputer after the color frequency signal of conversion is transferred to single-chip microcomputer among Fig. 4, calls arithmetic subroutine, and the result is shown that with the group of four figures pipe DS1 in the display board circuit of Figure 10～DS4 digital pipe display circuit is seen Figure 10.Described charactron is carried out a selected control system, and (circuit of we1～we5) is seen Figure 11, and described charactron is carried out Duan Xuan, and (a～g) circuit of control is seen Figure 12.Position selected control system and section selected control system are controlled by latch 74H573.
Trace routine of the present utility model and algorithm: it is that light intensity frequency values and chlorine ion concentration and pH value are done regretional analysis that this testing apparatus is carried out the purpose that data process, and draw regression curve, and the quality of rear curve is joined in measurement.Algorithm is the minimum value approximatioss: collect the color component RGB of test paper with color sensor, be transferred to single-chip microcomputer and store.Detect for chlorion, because the chlorion test paper has five lattice, with five sensor J1 ~ J5,3 data of sampling respectively, be respectively red component R, green component G, blue component B, can get 15 data.Utilize these five data and the colors list that is stored in the colour atla database in advance to compare respectively, obtain immediate color, and then obtain chlorine ion concentration corresponding to this color.This algorithm adopts relatively subroutine of color, and expression formula is:
Temp=|R1-R_1|+|G1-G_1|+|B1-B_1|+|R2-R_2|+|G2-G_2|+|B2-B_2|+|R3-R_3|+|G3-G_3|+|B3-B_3|+|R4-R_4|+|G4-G_4|+|B4-B_4|+|R5-R_5|+|G5-G_5|+|B5-B_5|
R1～R5 in the following formula, G1～G5, B1～B5 are the data that color sensor collects, and the R_1～R_5 in the following formula, G_1～G_5, B_1～B_5 are the colors list data in the colour atla database.R_1～R_5 in the expression formula, G_1～G_5, B_1 ~ B_5 be with different data substitutions, thereby obtain a plurality of Temp values.The last value of more resulting each Temp, wherein the minimum corresponding chlorine ion concentration of color corresponding to Temp is detected value.
The detection of pH value and chlorine ion concentration detect identical, just when detecting pH value, only need two color sensor work, detect respectively centre and the edge of pH test paper, so in the color comparison algorithm, only need 6 values to participate in calculating and get final product.
As shown in figure 13, the conductivity test section adopt dividing potential drop, follow, amplifying circuit.Among Figure 13, the resistance of R2 acute pyogenic infection of finger tip water with resistance R 3 dividing potential drops, makes voltage follow through 1/4 module of four-operational amplifier LM324, and another 1/4 module through four-operational amplifier LM324 makes voltage amplification again.Because voltage is analog quantity, with the A/D converter AD7810 among Figure 14 voltage analog is converted to digital quantity.AD7810 is 10 high speed serialization A/D converters of a kind of low-power consumption that ADI (Analog Devices) produces.This product has 8 pin DIP and two kinds of packing forms of SOIC, and with internal clocking.What adopt is the DIP packing forms, and its peripheral wiring is simple, and be 2 μ s the switching time of AD7810.AD is the analog quantity entrance, P1.0 is to working signal, P1.2 controls working method, and the working method that the utility model is selected is low-power consumption mode, after P1.2 gives a high level, keep low level, the P1.1 receiving digital signals of the single-chip microcomputer among Fig. 4 is processed by single-chip microcomputer, and the LED lamp that signal is transferred among Figure 10 shows, the control circuit of three LED lamps (GLED, YLED, RLED) sees that the position choosing of 10, three LED lamps of accompanying drawing is identical with charactron with the control circuit of Duan Xuan.The testing result healthy water is that green light (GLED) is bright, and drinkable water is that amber light (YLED) is bright, and non-drinkable water is that red light (RLED) is bright.
Power supply of the present utility model is supplied with three kinds of modes, the one, power with 5V, because the needed supply voltage of the utility model checkout equipment is 5V, adopt power supply voltage stabilizing chip LM2596 formation 24V as shown in figure 15 to turn 5V voltage transitions and mu balanced circuit in the present embodiment, obtain burning voltage.The 2nd, lithium battery power supply (using in the situation of outage) consists of lithium battery conversion and mu balanced circuit by power supply voltage stabilizing chip MAX667 in the present embodiment, sees Figure 16.The 3rd, by the Switching Power Supply power supply of 24v.
The trace routine flow process of being finished by single-chip microcomputer as shown in figure 17.Wherein all comprise its subroutine separately for every detection.Take the chlorion detection as example, its subroutine flow process as shown in figure 18.
Each electronic devices and components described in above-described embodiment circuit are the commercial goods.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present utility model and design, all should think to be included within the protection domain of the present utility model.
Claims (2)
1. quality of household drinking water multiparameter fast detecting equipment, it is characterized in that: comprise shell (1), be provided with T slot type drawer (2), the guide rail (5) of T slot type drawer (2) below and the cam post (3) in the middle of the guide rail (5) in the described shell (1); Offer porosely on the described shell (1), the end of T slot type drawer (2) and cam post (3) is arranged on place, described hole, and T slot type drawer (2) and cam post (3) are moved and can be extracted out from described hole along guide rail (5); The section radius of described cam post (3) does not wait, described cam post (3) and T slot type drawer (2) but the bottom fit tightly and axial rotation; The top of T slot type drawer (2) has confined chamber (8) in the described shell (1), and confined chamber (8) top has the polylith circuit board, comprises at least LED lamp array (9) and color sensor (10) on the circuit board; Has display window (7) on the corresponding shell of described circuit board (1); Be provided with in the described shell (1) can extract out put liquid box (4) and conductance electrode (6), an end of conductance electrode (6) stretches out shell (1), the other end stretches into to be put in the liquid box (4).
2. described quality of household drinking water multiparameter fast detecting equipment according to claim 1, it is characterized in that described circuit board comprises: single chip circuit, led array control circuit, color sensor control circuit, color sensor sheet selected control circuit processed, display board circuit, charactron and LED lamp position selected control circuit processed, charactron and LED lamp section selected control circuit processed, electrical conductivity measurement circuit, A/D change-over circuit, lithium battery switch voltage-stabilizing circuit and 24V turn 5V voltage transitions and mu balanced circuit;
Single chip circuit is made of single-chip microcomputer (80C52); LED lamp antenna array control circuit is composed in parallel by 5 LED lamps divider resistance circuit separately, by the switch by the LED lamp in the key control LED lamp antenna array control circuit in the display board circuit;
The color sensor control circuit is comprised of 5 color sensors (TCS230) and sensor socket; The inside of each color sensor (TCS230) is equivalent to a photodiode and adds an electric current to the converter of frequency; The high-low level combination of one group of pin (S0, S1) of color sensor (TCS230) determines the output frequency demarcation, and high-low level combination of another group pin (S2, S3) determines filter type; The color sensor control circuit comes the control strip choosing by the latch (74H573) in the color sensor sheet selected control circuit processed, comes gauge tap by the button in the display board circuit; Color sensor (TCS230) is processed through single-chip microcomputer (80C52) after the color frequency signal of conversion is transferred to single-chip microcomputer (80C52) in the single chip circuit, with the result with the (DS1～DS4) show of the group of four figures pipe in the display board circuit; (DS1～DS4) carries out a selected control system, and charactron and LED lamp section selected control circuit processed are to the described charactron (section of the carrying out selected control system of DS1～DS4) to described charactron for charactron and LED lamp position selected control circuit processed; Charactron and LED lamp position selected control circuit processed, consisted of by latch (74H573) by charactron and LED lamp section selected control circuit processed,
The resistance of water (R2) is through resistance (R3) dividing potential drop in the electrical conductivity measurement circuit, makes voltage follow through 1/4 module of four-operational amplifier (LM324), and another 1/4 module through four-operational amplifier (LM324) makes voltage amplification again; (AD7810) is converted to digital quantity with voltage analog with the A/D converter in the A/D change-over circuit, process through single-chip microcomputer (80C52), the result is shown with the LED lamp in the display board circuit, charactron and LED lamp position selected control circuit processed carry out a selected control system to described LED lamp, and charactron and LED lamp section selected control circuit processed are to the described LED lamp section of carrying out selected control system;
24V turns the 5V voltage transitions and mu balanced circuit is made of power supply voltage stabilizing chip (LM2596), is used for the 5V power supply; Lithium battery conversion and mu balanced circuit are made of power supply voltage stabilizing chip (MAX667), are used for powering in the situation of outage.
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| CN102680469A (en) * | 2012-06-07 | 2012-09-19 | 江南大学 | Multi-parameter rapid detection method and equipment for water quality of household drinking water |
| CN104374767A (en) * | 2013-08-13 | 2015-02-25 | 嘉兴驰网工业自动化科技有限公司 | Portable type intelligent food safety detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102680469A (en) * | 2012-06-07 | 2012-09-19 | 江南大学 | Multi-parameter rapid detection method and equipment for water quality of household drinking water |
| CN104374767A (en) * | 2013-08-13 | 2015-02-25 | 嘉兴驰网工业自动化科技有限公司 | Portable type intelligent food safety detector |
| CN104483550A (en) * | 2014-11-05 | 2015-04-01 | 南京华印半导体有限公司 | Method used for measuring resistance values of printed metal electrode |
| CN104483550B (en) * | 2014-11-05 | 2017-06-16 | 南京华印半导体有限公司 | A kind of method for measuring type metal electrode resistance |
| CN105675517A (en) * | 2016-01-07 | 2016-06-15 | 高超 | Portable equipment for rapid water quality detection and detection method |
| WO2017152547A1 (en) * | 2016-03-08 | 2017-09-14 | 京东方科技集团股份有限公司 | Colour identification device and colour identification method |
| US10197447B2 (en) | 2016-03-08 | 2019-02-05 | Boe Technology Group Co., Ltd. | Color recognition device and color recognition method |
| WO2021057230A1 (en) * | 2019-09-26 | 2021-04-01 | 五邑大学 | Color identification-based water quality detection method, apparatus and device, and storage medium |
| CN111307795A (en) * | 2020-04-13 | 2020-06-19 | 马学文 | Water quality detection device |
| CN111735683A (en) * | 2020-08-27 | 2020-10-02 | 南京锦华机械制造有限公司 | River pollution detection equipment |
| CN112345830A (en) * | 2020-10-30 | 2021-02-09 | 厦门市三特兴电子有限公司 | Game paddle rocker circuit board resistance voltage index detection method |
| CN112345830B (en) * | 2020-10-30 | 2024-01-19 | 厦门市三特兴电子有限公司 | Game paddle rocker circuit board resistance voltage index detection method |
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