CN203588308U - Remote metering device and counter reading circuit thereof - Google Patents
Remote metering device and counter reading circuit thereof Download PDFInfo
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- CN203588308U CN203588308U CN201320688643.0U CN201320688643U CN203588308U CN 203588308 U CN203588308 U CN 203588308U CN 201320688643 U CN201320688643 U CN 201320688643U CN 203588308 U CN203588308 U CN 203588308U
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Abstract
The utility model provides a remote metering device and a counter reading circuit thereof. The counter reading circuit comprises a digit wheel, a plurality of groups of photoelectric sensors, and a single-chip microcomputer connected with the photoelectric sensors. The digit wheel comprises a plurality of counter wheels on different digits. Each group of the photoelectric sensors is corresponding to one counter wheel. Each photoelectric sensor comprises a luminotron and an optical receiving tube, wherein each group of photoelectric sensors comprise two photoelectric sensors, and the two photoelectric sensors are connected in parallel. The remote metering device and the counter reading circuit have the advantages of low cost, accurate data sensing, reliable performance, low operating failure rate, etc.
Description
Technical field
The utility model relates to a kind of long-distance metering instrument, relates in particular to the meter reading circuit of long-distance metering instrument, belongs to identification and the processing technology field of measuring instrument data.
Background technology
The measuring instruments such as traditional ammeter, water meter, gas meter all adopt mechanical type register, are a kind of artificial direct-reading summary counters.The outstanding advantages of this class mechanical type register is just can measure (as water meter, gas meter) by power supply, and shortcoming is that manually reading is checked meter.
Along with social progress, the development of electronic technology and network communication, last century the nineties, people start application electric technology the ammeter of mechanical type meter degree, water meter, gas meter count value are carried out to long-range reading, and by wired and wireless network transmissions, to computer center, carry out Display and Print (being remote meter reading).
About the long-range existing a lot of public technologies of the method and apparatus of checking meter that read, for example, adopt the patent document that wheel type electronic is checked meter just to have up to a hundred more than.From disclosed patent documentation, can see, to measuring instruments such as ammeter, water meter, gas meters, carrying out the long-range solution reading more is by pulsed, to count to carry out digitized processing, by the number of revolutions of a certain rotatable parts of this instrument is carried out to pulse output metering by light, magnetic or resonant inducing mode etc., a pulse or pulse group are once just exported in every rotation, then are carried out digitized processing and added up and store by one-chip computer.But this mode shortcoming is to be easily disturbed; For mechanical water meter or gas meter etc., there is no electric measuring instrument, pulse metering device must guarantee the external electricity of overall process in metering, easily causes metering inaccurate when power-off.Developed afterwards contactless electronic reading device, the Chinese patent that is 00208157.1 as the patent No. discloses the mechanical rotary-type counter that a kind of electronic digitalizing reads, and the patent No. Chinese patent that is 00105255.1 discloses a kind of electronic digitalizing read method of mechanical rotary-type counter.Its digitizing read be by emission of light to digital runner, on digital runner, the region of corresponding reading is echo area or uptake zone, the reflected light of four open the light volume sensor detection of reflected district or uptake zones, and being judged as out (1) or (0) state of closing, the state of arranging by four digital differences that sense is determined the definite reading in vision area.Above-mentioned two patent documentations can carry out contactless electronic to measuring instrument and read, solved the problems such as the secondary measurement that step-by-step counting brings, still, because the two all adopts switching regulator sensor to carry out electronics, read, be easy to cause reading inaccurate, be difficult to apply.
In addition, research is found, there is the mounting means that need to change water, electricity, gas pipeline in the wheeled and various electronic remote metering water meters of existing machinery, ammeter, gas meter, exist volume large, transmission data are unstable, reading error is large, high in cost of production shortcomings, and what really should use is few.
The shortcoming existing according to electronic remote measuring instrument, application number is the contactless electronic reading sensing device that the Chinese patent application of CN01106500.1 discloses a kind of mechanical type instrument, and the Chinese patent application that application number is CN00122436.0 discloses a kind of self-correction multifunctional electronic power meter and network thereof, the two is large to measuring instrument volume, and transmission data are unstable a further improvement.
But in existing disclosed contactless electronic reading sensing device, still there is the outstanding shortcomings such as reading error, particularly in photoelectric reading method for sensing and device, the inductive head of the sensor of reading device generally has electronic noise, in some cases, electronic noise may have been covered the actual signal sensing, or also stronger than actual signal, thereby causes the generation of misreading; In addition, the digital runner of measuring instrument has the vision area for reading on people's visual inspection runner, therefore in the situation that ambient light enters measuring instrument and irradiates digital runner from vision area, increased the reflected light of digital runner, result sensor detects wrong signal, such as responding to less than catoptrical, due to the impact of bias light, light detected mistakenly, thereby think that this region is high-reflection region.All above-mentioned defects all must cause correctly reading of existing reading device, or can not steady operation.
In order to change the impact of reflected light (bias light), application number is a kind of electronic reader and the method thereof that the Chinese patent application of CN200510035995.6 discloses mechanical rotary-type counter, and the Chinese patent application that application number is CN200510036371.6 provides a kind of electronic reader of rotary-type counter.
Aspect physical construction, the Chinese patent application that application number is CN201110274440.2 provides a kind of direct-reading water meter register, and it improves the inner reading wheel of electronic remote measuring instrument and installation of sensors mode.This direct-reading electronic register is compared with technology before, maximum feature is: induction installation is arranged on runner or rotating disk side, on runner or rotating disk, be provided with reading, reading region is sensed district, induction installation is a nalog quantity type photoelectric sensor, sensed district is aberration reflective areas, and electronical reading is the difference of rejecting after background noise.This register experience on probation shows: it has, and cost is low, sensing data accurately, the advantage such as dependable performance, operational failure rate be low.
But in practice process, find that this direct-reading electronic register also exists following problem:
1, due to single-chip microcomputer and sensor line many, so be all that single-chip microcomputer is placed in the water environment of water meter inside, if seal bad, easily damage.
In the design of structure, the one, rounding wheel is arranged on bottom or the side of digit wheel, the each numeral of digit wheel is corresponding inlays or scribbles the material corresponding with sensor, several sensors to digit wheel identification are installed in housing, circuit board is arranged on the bottom of housing, and by lead-in wire, signal is exported, character wheel box, sensor and the gear drive of this structure is arranged on respectively in two cavitys, makes the complex structure of water meter counter; The 2nd, because gear drive need to be crossed over two cavitys, cause the side leakage of spacer pad from fluid-tight chamber.
2, cannot as under 3.6V, work in low-voltage, increase like this power consumption, service life of equipment is short.
In order to solve the problem of said structure aspect, application number is the open a kind of full liquid-sealing water meter counter of the Chinese patent application of CN201210268166.2, it comprises character wheel box, digit wheel, gear drive, driving wheel and photoelectric counter, gear drive, digit wheel, driving wheel and photoelectric counter are all installed in character wheel box, driving wheel is arranged on the top of digit wheel, and engage with digit wheel, photoelectric counter is arranged on side or the bottom of digit wheel, in the cavity of character wheel box, be full of the low water white spacer pad of density ratio water, photoelectric counter can whole bubble in spacer pad, gear drive is exported from the bottom of character wheel box after by impeller transmission, have reasonable in design, simple in structure, counting degree of accuracy is high, the features such as wide adaptability.
For the sensor problem that induction installation exists in other words, at present still without reliable solution, the technology that mostly still adopts Chinese patent application that technology that Chinese patent application that conventional art or application number are CN200510035995.6 provides or application number are CN200510036371.6 to provide, when a sensor failure, may cause the remote reading function of whole measuring instrument to move.
Utility model content
The purpose of this utility model is to provide a kind of long-distance metering meter counter and reading device thereof, the potential faults existing to solve prior art
For solving the problems of the technologies described above, the utility model provides a kind of meter reading circuit of long-distance metering instrument, and its technical scheme is as follows:
A kind of meter reading circuit of long-distance metering instrument, comprise digit wheel, photoelectric sensor and the single-chip microcomputer being connected with described photoelectric sensor, described digit wheel comprises the multiple counter wheels that are positioned at different numerical digits, described photoelectric sensor is many groups, described in every group, photoelectric sensor is corresponding with counter wheel described in each, each described photoelectric sensor comprises luminotron and light receiving tube, wherein, described in every group, photoelectric sensor comprises two described photoelectric sensors in parallel, after described in each, the described luminotron anode tap of photoelectric sensor is connected and is connected with the collector of described light receiving tube after a resistance, be connected with the output terminal of one first electronic switch again, described in each, the input end of the first electronic switch is connected to receive steering order with an output port of described single-chip microcomputer respectively, and described in every group, two of photoelectric sensor described light receiving tube output terminal emitters are connected with output electrical signals with one the one A/D input port, one the 2nd A/D input port of described single-chip microcomputer respectively.
Preferably, described in every group, the negative pole end of the described luminotron of photoelectric sensor is all connected with the input end of one second electronic switch, the control end of described the second electronic switch is connected to receive steering order, the output head grounding of described the second electronic switch with an output port of described single-chip microcomputer.
Preferably, described the first electronic switch, described the second electronic switch are triode, field effect transistor or the IC with switching function.
For solving the problems of the technologies described above, the utility model provides a kind of long-distance metering instrument, and its technical scheme is as follows:
A kind of long-distance metering instrument, comprises meter reading circuit, wherein, and the meter reading circuit that described meter reading circuit is above-mentioned arbitrary long-distance metering instrument.
The beneficial effect of technique scheme of the present utility model is as follows:
Adopt sensor in parallel directly photosignal to be received to the AD converter of single-chip microcomputer, convert simulating signal to digital signal, then by single-chip microcomputer, processed, there is cost low, the advantage such as sensing data accurately, dependable performance, operational failure rate be low.And connection is simple, sensor and single-chip microcomputer can be divided into two parts is connected, so that these two parts can be placed in separately water meter inside and outside.
In addition, the utility model can adopt nalog quantity type photoelectric sensor, and photoelectric sensor can be arranged on digit wheel or digital rotating disk side, and the reading region arranging on digit wheel or rotating disk is sensed district, sensed district be aberration reflective areas or or light hole, electronical reading can be the difference of rejecting after background noise, so after processing via single-chip microcomputer, can improve the accuracy of reading, automaticity is high, and method is simple, processing ease.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of meter reading circuit embodiments of the present utility model.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Need boost when solving battery operated that prior art exists, problem that power consumption is large, the utility model provides a kind of meter reading circuit of long-distance metering instrument, it can be applied to water meter, ammeter, gas meter, gas meter, flow meter etc., is preferably applied to water meter.
Fig. 1 shows the circuit structure of meter reading circuit embodiments of the present utility model, due to the present embodiment can with the physical construction fit applications of multiple measuring instrument of the prior art, therefore, the physical construction of the present embodiment repeats no more.
As shown in Figure 1, meter reading circuit embodiments of the present utility model comprises digit wheel (not shown), organizes photoelectric sensor and the single-chip microprocessor MCU being connected with many groups photoelectric sensor more.Wherein, digit wheel comprises the multiple counter wheels that are positioned at different numerical digits, multiple photoelectric sensor S11, S12......Sn1, Snm are divided into many groups, according to the arrangement of Fig. 1, the row photoelectric sensor longitudinally arranging is one group of photoelectric sensor, also the 1st group to n(for example, 2≤n or 2≤n≤7) group.Every group of photoelectric sensor S11 and S12 ... or Sn1 and Snm(2≤n≤7) corresponding with each counter wheel, each photoelectric sensor S11, S12......Sn1, Snm comprise for emitting beam and by the digital luminotron on counter wheel corresponding the light directive sending with for receiving from numercal light and light signal being converted to the light receiving tube of electric signal.For example, for example, due to the icon that shows luminotron (light emitting diode, more specifically, infrarede emitting diode) and light receiving tube (phototriode) that Fig. 1 has known, in order to simplify accompanying drawing, Fig. 1 no longer marks luminotron and light receiving tube.Luminotron, the light receiving tube of each photoelectric sensor S11, S12......Sn1 or Snm all couple (being directly or indirectly connected) with single-chip microprocessor MCU, thereby single-chip microprocessor MCU receives the electric signal of light receiving tube transmission and processes electric signal and identify the numeral on corresponding with it counter wheel.Every group of photoelectric sensor comprises at least two photoelectric sensors in parallel, for example photoelectric sensor S11, S12, S1m, also the 1st group of photoelectric sensor comprises photoelectric sensor S11-S1m, ... m group photoelectric sensor comprises photoelectric sensor Sn1-Snm, photoelectric sensor S11, S1m parallel connection ... photoelectric sensor Sn1, Snm parallel connection.
The photoelectric sensor S11-S1m of every group or the input end of photoelectric sensor Sn1-Snm are connected with electronic switch JP-n respectively.
What need clearer explanation is, single-chip microprocessor MCU shown in Fig. 1 is AVR single-chip microcomputer, but the utility model is not limited to this, other single-chip microcomputers well known in the art and digital signal processor also can be used as signal handling equipment of the present utility model, such as MCS51 single-chip microcomputer etc.
In the present embodiment, as by powered battery, consider lower voltage problem, set up the second stabilized voltage supply VCC2 that is less than power supply VCC1.Otherwise VCC2 can be connected with VCC1.
As shown in Figure 1, the circuit of the present embodiment connects comparatively complicated, comprise more electron device, such as line JP-1......JP-n, resistance R 70...... resistance R 7m, resistance R 1...... resistance R n1, resistance R 90, triode Q1......Qn etc., although components and parts are more, but Fig. 1 is clear, its circuit structure is shown, does not repeat them here the annexation between it.
RT is temperature sensor, and temperature that can detecting sensor environment, so that single-chip microcomputer does the reference of data processing.The elements such as triode Q00, Q01 and resistance R 80, R81, R82 are made switching mode constant current source, to increase the accuracy of reading
During application, if two photoelectric sensor parallel connections, I/O mouth (PB0-PBn) the output high level of single-chip microprocessor MCU, all photoelectric sensors are not worked, now single-chip microprocessor MCU, by reading the analog ports such as AD0-AD1, can obtain the 1st group of static numerical value to n group: A11, A12, ... An1, An2.
Run through after quiescent value, give in turn in order one of them the port output low level in PB1-PBn port, remaining I/O port is high level, if port PB1 is low, and the first electronic switch Q1 conducting.When port PB0 is low, the second electronic switch Q00, Q01 are obstructed, the luminotron of photoelectric sensor S11 does not work, this is background light value A11, A12 that the machine-readable A/D of startup monolithic can obtain photoelectric sensor, then PB0 is high, the second electronic switch Q00, Q01 are logical, the luminotron of photoelectric sensor S11 is lighted, illuminate corresponding with it counter wheel surface, (also can slotted hole not of uniform size be set according to certain rules in counter wheel side, luminotron sees through hole and shines light receiving tube the light receiving tube of light reflected light electric transducer S11; Also can make according to certain rules male and fomale(M&F) on counter wheel surface, luminotron is lighted, illuminate corresponding with it counter wheel male and fomale(M&F), light reflected light receiving tube), the emitter e of light receiving tube produces voltage proportional to receiving light power degree, single-chip microprocessor MCU, by difference read port AD0-AD1, can obtain corresponding numerical value: B11, B12.
The value of first group two corresponding counter wheels of photoelectric sensor (or being called sensor) S11, S12 (or being called wheel) color or light hole size is so:
C11=B11-A11；
C12=B12-A12；
The corresponding wheel color of two sensor Sn1, Sn2 of n group or the value of light hole size are:
Cn1=Bn1-An1；
Cn2=Bn2-An2；
Through single-chip microprocessor MCU, carry out numerical value processing, if it is 6 that reflective white or the numerical value Cnx through macropore or convex surface reflection gained adjust, reflecting light gray or adjusting through the numerical value Cnx of mesopore or half convex surface reflection gained is 4, reflecting Dark grey or adjusting through the numerical value Cnx of aperture or plane reflection gained is 2, reflecting black or adjusting through the numerical value Cnx of atresia or concave reflection gained is 0, can draw the one coding of counter wheel numeral 0-9.
As the position coating black of the 9-0 at wheel or light tight hole, at 3-4-7, be coated with light grey or middle light hole, at 1-2-8, be coated with Dark grey or little light hole, at 5-6 coating white or full impregnated unthreaded hole, what single-chip microprocessor MCU obtained after processing is encoded to:
Coding when the corresponding coding of wheel sub-figure wheel forwards in the middle of numeral
Encode very many, that is to say and adopt such circuit and the structure of wheel, after processing by single-chip microprocessor MCU numerical value, can draw hundreds of kind coding, be enough to identify any position that whole counter wheel is positioned, thereby reach the numeral (0-9) that precisely reads wheel, solve the transition problem of wheel.
In addition, the present embodiment can directly adopt low pressure as 3.6V powered battery, do not need to boost, and extending battery life; Comprise that the control section of single-chip microprocessor MCU and the line of sensor group are few, make single-chip microprocessor MCU control section can separate and dispose with sensor group, as shown in Figure 1, take JP-1......JP-n as node, in Fig. 1, the sensor group on node right side can be placed in shell of water flowmeter, the single-chip microprocessor MCU control section in node left side can be arranged on outside shell of water flowmeter, by several lead-in wires, they is connected.Once Sensor section has water to infiltrate like this, control section can detect, and makes relevant treatment, and the water resistance of product is improved greatly, the temperature that temperature sensor Rt can survey sensor group periphery.
When concrete application, if three photoelectric sensor parallel connections, the value of first group three sensor S11, S12, the corresponding wheel color of S13 or light hole sizes is so:
C11=B11-A11；
C12=B12-A12；
C13=B13-A13；
The corresponding wheel color of three sensor Sn1, Sn2, Sn3 of n group or the value of light hole size are:
Cn1=Bn1-An1；
Cn2=Bn2-An2；
Cn3=Bn3-An3；
Carry out numerical value processing through single-chip microprocessor MCU, establish reflective white or see through macropore or convex surface is reflected into 4, reflection grey or see through aperture or plane reflection is 2, reflection black or see through atresia or concave reflection is 0, can draw the one coding of counter wheel numeral 0-9.
As the position coating black of the 9-0-1 at wheel or light tight or make concave surface, at 2-3-7-8, be coated with grey or semi-transparent or make plane, at 4-5-6 coating white or full impregnated light or make convex surface, what single-chip microprocessor MCU obtained after processing is encoded to:
Coding in the time of in the middle of the corresponding coded digital of wheel sub-figure is transitioned into
As the position coating black of the 0-1 at wheel or light tight or make concave surface, at 2-3-7-8-9, be coated with grey or semi-transparent or make plane, at 4-5-6 coating white or full impregnated light or make convex surface, after single-chip microprocessor MCU is processed, the numerical value Cnx of full impregnated light gained is made as 4, the semi-transparent numerical value Cnx that establishes gained is 2, and the numerical value Cnx of light tight gained is made as 0, and what obtain is encoded to:
Coding in the time of in the middle of the corresponding coded digital of wheel sub-figure is transitioned into
Analogize therewith, after single-chip microprocessor MCU is processed several status datas that obtain after AD conversion, can produce very many codings, that is to say and adopt such circuit and the structure of wheel, after processing by single-chip microprocessor MCU numerical value, can draw hundreds of kind coding, be enough to identify any position that whole counter wheel is positioned, thereby reach the numeral (0-9) that precisely reads wheel, solve the transition problem of wheel.
If four photoelectric sensor parallel connections, the value of first group four sensor S11, S12, the corresponding wheel color of S13, S14 or light hole sizes is so:
C11=B11-A11；
C12=B12-A12；
C13=B13-A13；
C14=B14-A14；
The corresponding wheel color of four sensor Sn1, Sn2, Sn3, Sn4 of n group or the value of light hole size are:
Cn1=Bn1-An1；
Cn2=Bn2-An2；
Cn3=Bn3-An3；
Cn4=Bn4-An4；
Carry out numerical value processing through single-chip microprocessor MCU, establish reflective white or see through macropore or the numerical value Cnx of convex surface reflection gained is 2,, reflection black or the numerical value Cnx that sees through atresia or concave reflection gained are 0, can draw the one coding of counter wheel numeral 0-9.
As the position coating black of the 8-9-0-1-3 at wheel or light tight or make concave surface, at 4-5-6-7-2 coating white or full impregnated light or make convex surface, what MCU obtained after processing is encoded to:
Coding in the time of in the middle of the corresponding coded digital of wheel sub-figure is transitioned into
Can find out, adopt after described circuit, wheel structure and encoding scheme, can use the transition state of code identification wheel, thereby reach the numeral (0-9) that precisely reads wheel, solve the transition problem of wheel.
If five photoelectric sensor parallel connections, the value of first group five sensor S11, S12, S13, S14, the corresponding wheel color of S15 or light hole sizes is so:
C11=B11-A11；
C12=B12-A12；
C13=B13-A13；
C14=B14-A14；
C15=B15-A15；
The corresponding wheel color of five sensor Sn1, Sn2, Sn3, Sn4, Sn5 of n group or the value of light hole size are:
Cn1=Bn1-An1；
Cn2=Bn2-An2；
Cn3=Bn3-An3；
Cn4=Bn4-An4；
Cn5=Bn5-An5；
Carry out numerical value processing through single-chip microprocessor MCU, establish reflective white or see through macropore or the numerical value Cnx of convex surface reflection gained is 2, reflection black or the numerical value Cnx that sees through atresia or concave reflection gained are 0, can draw the one coding of counter wheel numeral 0-9.
As the position coating black of the 9-0-1-2-3 at wheel or light tight or make concave surface, at 4-5-6-7-8 coating white or full impregnated light or make convex surface, what single-chip microprocessor MCU obtained after processing is encoded to:
Coding in the time of in the middle of the corresponding coded digital of wheel sub-figure is transitioned into
It can be seen, adopt after described circuit, wheel structure and encoding scheme, can use the transition state of code identification wheel, thereby reach the numeral (0-9) that precisely reads wheel, solve the transition problem of wheel.
As from the foregoing, during normality, the port PB0=0 of single-chip microprocessor MCU, not conducting of triode Q0; Port PB1--PBn=1, not conducting of triode Q1-Qn, photoelectric sensor group is not worked.
While working 0 state, port PB0=0, not conducting of triode Q0, as order, put in port PB1-PBn one for low level, all the other are high level, detection port AD(0---m) on voltage, after the A/D of single-chip microprocessor MCU conversion, obtain the numerical value A01 of all the sensors, A02...A0n, Am1, Am2...Amn, as Amn=0, without leaking or unglazed interference, if Amn>0, leaks or has light to disturb.
While working 1 state, port PB0=1, triode Q0 conducting, same of sequentially putting in port PB1-PBn is low level, all the other are high level, detect AD(0---m) on voltage, after the A/D of single-chip microprocessor MCU conversion, obtain the numerical value B01 of all the sensors, B02...B0n, Bm1, Bm2...Bmn.
Single-chip microprocessor MCU is carried out data processing: Cmn=Bmn-Amn; Cmn is the light intensity magnitude that wheel is reflective or printing opacity is returned that each photoelectric sensor is corresponding, compares the size combinations of these Cmn, can determine the position of wheel, thereby knows the numeral (0-9) at wheel place.
Above-mentioned arbitrary meter reading circuit embodiments all can be applied to polytype long-distance metering instrument, realizes the remote meter reading of this measuring instrument.
To sum up, the utility model can be connected with sensor group single-chip microcomputer by little line, single-chip microcomputer and sensor group can be placed separately like this, sensor group is worked in water meter, single-chip microcomputer can be worked under anhydrous environment outside water meter, even if sensor group is leaked, single-chip microcomputer can detect, and the size of leaking according to it, whether determination data is reliable, making electronical reading is the difference of rejecting after background noise, detecting light disturbs or leaks and filtering part light and the interference of leaking, improved the accuracy of reading, automaticity is high, method is simple, processing ease.Adopting sensor in parallel that photosignal is delivered to single-chip microcomputer processes, even if one of them is malfunctioning for one group of sensor, still can guarantee the stability of reading and output, and it is low to have cost, the advantage such as sensing data accurately, dependable performance, operational failure rate be low.In addition, circuit of the present utility model can be operated in about 3V, need not boost like this, can powered battery, improve battery life, and working sensor voltage is low simultaneously, can reduce the impact of leaking on sensor reading.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (3)
1. the meter reading circuit of a long-distance metering instrument, comprise digit wheel, photoelectric sensor and the single-chip microcomputer being connected with described photoelectric sensor, described digit wheel comprises the multiple counter wheels that are positioned at different numerical digits, described photoelectric sensor is many groups, described in every group, photoelectric sensor is corresponding with counter wheel described in each, each described photoelectric sensor comprises luminotron and light receiving tube, it is characterized in that, described in every group, photoelectric sensor comprises two described photoelectric sensors in parallel, after described in each, the described luminotron anode tap of photoelectric sensor is connected and is connected with the collector of described light receiving tube after a resistance, be connected with the output terminal of one first electronic switch again, described in each, the input end of the first electronic switch is connected to receive steering order with an output port of described single-chip microcomputer respectively, and described in every group, two of photoelectric sensor described light receiving tube output terminal emitters are connected with output electrical signals with one the one A/D input port, one the 2nd A/D input port of described single-chip microcomputer respectively.
2. the meter reading circuit of long-distance metering instrument according to claim 1, is characterized in that, described the first electronic switch is triode or the IC with switching function.
3. a long-distance metering instrument, comprises meter reading circuit, it is characterized in that, described meter reading circuit is the meter reading circuit of the arbitrary described long-distance metering instrument of claim 1-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320688643.0U CN203588308U (en) | 2013-11-04 | 2013-11-04 | Remote metering device and counter reading circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320688643.0U CN203588308U (en) | 2013-11-04 | 2013-11-04 | Remote metering device and counter reading circuit thereof |
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| CN203588308U true CN203588308U (en) | 2014-05-07 |
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| CN201320688643.0U Expired - Fee Related CN203588308U (en) | 2013-11-04 | 2013-11-04 | Remote metering device and counter reading circuit thereof |
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