CN111474883A - Automatic sampling circuit for counting double reed switches of intelligent water meter - Google Patents
Automatic sampling circuit for counting double reed switches of intelligent water meter Download PDFInfo
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- CN111474883A CN111474883A CN202010329433.7A CN202010329433A CN111474883A CN 111474883 A CN111474883 A CN 111474883A CN 202010329433 A CN202010329433 A CN 202010329433A CN 111474883 A CN111474883 A CN 111474883A
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- 238000005070 sampling Methods 0.000 title claims abstract description 100
- 235000014676 Phragmites communis Nutrition 0.000 title claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 230000007958 sleep Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000011664 signaling Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005059 dormancy Effects 0.000 description 3
- 230000001934 delay Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004622 sleep time Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/068—Indicating or recording devices with electrical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
- G01F15/0755—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means involving digital counting
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an automatic sampling circuit for counting double Reed switches of an intelligent water meter, which comprises a Reed switch Reed1, a Reed switch Reed2, a sampling resistor R1 and a singlechip; the single chip microcomputer comprises a power supply pin, a grounding pin, a counting pin and a control pin; one end of the sampling resistor R1 is connected with a power supply pin, and the other end is connected with a counting pin; the common ends of the Reed1 and the Reed2 are connected with a counting pin, and the other ends of the Reed1 and the Reed2 are respectively connected with two control pins; the output end of the double reed switch is sampled and counted by the single chip microcomputer according to a time sequence designed by internal software in a working mode, a resistor connected with the reed switch in series consumes current during sampling, the single chip microcomputer stops working in a sleep mode without consuming current, and the current consumption of the whole sampling circuit is kept between 2.85 and 3.15 microamperes. Therefore, the power consumption is reduced, and the reliability of the sampling circuit is improved; software design in the single chip effectively replaces a hardware filter capacitor, improves sampling anti-interference capability, reduces hardware cost and improves product reliability.
Description
Technical Field
The invention relates to the technical field of intelligent water meter systems, in particular to an automatic sampling circuit for counting double reed switches of an intelligent water meter.
Background
A common technology in intelligent water meter is to convert the mechanical reading of base meter into electronic reading through sensor, the most used is double-dry-reed-tube sensor at present, which is usually composed of single chip, sampling resistor, filter capacitor and double-dry-reed tube, the double-dry-reed-tube is usually placed near the signaling magnetic steel of the base meter counter, the position is convenient for the reliable detection of the double-dry-reed-tube, when the base meter is metering, the signaling magnetic steel on the base meter counter will rotate, at this time, the double-dry-reed-tube will be attracted and disconnected, the single chip periodically and intermittently supplies power to the double-dry-reed-tube, the rotary change of the magnetic steel is detected through the double-dry-reed-tube, and then the electronic reading of the base meter counter is obtained.
The prior art generally adopts the technology of patent number Z L201720855134.0 (a low-power consumption tongue tube sampling circuit), and the shortcoming of this circuit is that the components and parts that need when realizing low-power consumption sampling function are more, and intelligent instrument comprises a lot of components and parts usually, and the whole reliability of product often is less than the reliability of components and parts, and the more components and parts that the product contains the product the reliability of product just lower, still can increase manufacturing cost during mass production, reduction market competition.
Disclosure of Invention
The invention provides an automatic sampling circuit for counting double reed switches of an intelligent water meter, which can realize automatic sampling and counting of the double reed switches with low power consumption by adjusting the automatic control and sampling time sequence of a single chip microcomputer.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic sampling circuit for counting double Reed switches of an intelligent water meter comprises a Reed switch Reed1, a Reed switch Reed2, a sampling resistor R1 and a singlechip;
the single chip microcomputer comprises a power supply pin VDD, a grounding pin VSS, a counting pin PG5, a control pin PG6 and a control pin PA 4;
one end of the sampling resistor R1 is connected with a power supply pin VDD of the single chip microcomputer, and the other end of the sampling resistor R1 is connected with a counting pin PG5 of the single chip microcomputer; the common ends of the Reed1 and the Reed2 are connected with a counting pin PG5 of the singlechip, and the other ends of the Reed1 and the Reed2 are respectively connected with a control pin PG6 and a control pin PA4 of the singlechip;
the single chip microcomputer comprises a sleep mode and a working mode, the single chip microcomputer samples and counts the output end of the double reed pipe according to a time sequence designed by software in the working mode, the single chip microcomputer stops working in the sleep mode, and the current consumption of the whole sampling circuit is kept between 2.85 microamperes and 3.15 microamperes.
Preferably, the inherent program of the single chip microcomputer comprises a main control module, and an initialization module, an interruption module, a clock module, a counting module, a display module and a switch valve module which are respectively connected with the main control module;
the counting module enables a Reed switch Reed1 and a Reed switch Reed2 to be connected to a counting pin PG5 in a time-sharing mode through switching of a control pin PG6 and a control pin PA4, and is used for recording suction times of the Reed switch Reed1 and the Reed switch Reed2 and electronic reading of the intelligent water meter respectively;
when the counting module switches the Reed1 sampling work, a low level is output through a switching control pin PG6, a power supply pin VDD, a sampling resistor R1, a counting pin PG5, a Reed1 and a control pin PG6 form a sampling circuit of the Reed1, the level state of the Reed1 is collected, and the control pin PG6 is switched to be in an input high-resistance state after sampling is finished;
when the counting module switches the Reed2 sampling work, a low level is output through a switching control pin PA4, a power supply pin VDD, a sampling resistor R1, a counting pin PG5, a Reed2 and a control pin PA4 form a sampling circuit of the Reed2, the level state of the Reed2 is collected, and the control pin PA4 is switched to be in an input high-resistance state after sampling is finished.
Preferably, the counting module comprises a counter JS1 and a counter JS2, the counter JS1 is used for recording the suction times of the Reed pipe Reed1, the counter JS2 is used for recording the suction times of the Reed pipe Reed2, the counter JS2 is used for electronic reading of the intelligent water meter, and the initial values of the counter JS1 and the counter JS2 are both set to be 0.
Preferably, a 100uS delay unit is further arranged in the counting module, and after the delay can effectively ensure that the Reed switch Reed1 or Reed switch Reed2 sampling circuit works stably, the counting pin PG5 can effectively reflect the actual suction or disconnection state of the Reed switch Reed1 or Reed switch Reed 2.
Preferably, the counting module is further provided with a de-jitter processing unit, the de-jitter processing unit can effectively remove uncertain states when the Reed switch Reed1 or the Reed switch Reed2 is in a critical state of pull-in and pull-out, and abrupt voltage on the counting pin PG5 is filtered.
Due to the structure, the invention has the advantages that:
the automatic sampling circuit is used for sampling metering signals of the intelligent water meter based on double reed pipes, and can realize automatic sampling counting of the double reed pipes with low power consumption through automatic control and sampling time sequence adjustment of a single chip microcomputer. Meanwhile, when the single chip microcomputer is used for sampling, the resistor connected with the reed switch in series consumes about 3 milliamperes of current, in order to reduce the current consumption of the sampling resistor, a sleep mode is introduced, the ratio of sleep time to sampling time is about 1000 times, the reed switch sampling resistor does not consume current in the sleep mode, and thus the current consumed by the sampling resistor in the sampling period is dispersed to the sleep period and becomes about 3 microamperes (2.85-3.15 microamperes), so that the power consumption is reduced, and the reliability of the sampling circuit is improved; the counting module in the single chip microcomputer is also provided with 100uS delay and debouncing processing, so that the effect of a hardware filter capacitor is effectively achieved, the anti-interference capability of sampling is improved, the hardware cost is reduced, and the product reliability is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a block diagram of the inherent program of the single chip microcomputer of the present invention;
FIG. 3 is a flow chart of sample counting using the present invention;
fig. 4 is a schematic diagram of a circuit for sampling and counting a plurality of reed switches according to the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an intelligent water meter, the signaling magnetic steel on the base meter is usually placed at' × 0.01.01 m3"Dial pointer, Reed1 is placed on base watch" × 0.01.01 m3Near the front of the dial 2, Reed2 is placed in the base watch × 0.01m3The vicinity directly in front of "on dial" 6 "; when the signaling magnetic steel is turned to the scale 3 from the scale 1, the Reed1 in the interval is in a suction state, and Reed1 in other intervals are disconnected; when the signaling magnetic steel is turned to the scale 7 from the scale 5, the Reed2 in the interval is in a suction state, and Reed2 in other intervals are disconnected; if the suction of the Reed switch is '0' logic, the disconnection of the Reed switch is '1' logic, when the signaling magnetic steel rotates clockwise for one turn from the scale '0', the logic state of the double Reed switches is changed to 11 → 01 → 11 → 10 → 11, and in the normal logic change, the Reed switch Reed1 and the Reed switch Reed2 can not be sucked simultaneously. When the base meter is used for metering, the signaling magnetic steel on the base meter counter can rotate, at the moment, the double reed pipes can be attracted and disconnected frequently, the single chip microcomputer periodically and intermittently supplies power to the double reed pipes, the rotary change of the magnetic steel is detected through the double reed pipes, and then the electronic reading of the base meter counter is obtained.
As shown in fig. 1 to 4, the present embodiment provides an automatic sampling circuit for counting the double Reed switches of an intelligent water meter for an intelligent water meter based on double Reed switch sampling, which includes a Reed1, a Reed2, a sampling resistor R1 and a single chip microcomputer;
the single chip microcomputer comprises a power supply pin VDD, a grounding pin VSS, a counting pin PG5, a control pin PG6 and a control pin PA 4;
one end of the sampling resistor R1 is connected with a power supply pin VDD of the single chip microcomputer, and the other end of the sampling resistor R1 is connected with a counting pin PG5 of the single chip microcomputer; the common ends of the Reed1 and the Reed2 are connected with a counting pin PG5 of the singlechip, and the other ends of the Reed1 and the Reed2 are respectively connected with a control pin PG6 and a control pin PA4 of the singlechip;
the single chip microcomputer comprises a sleep mode and a working mode, the single chip microcomputer samples and counts the output end of the double reed pipe according to a time sequence designed by software in the working mode, the single chip microcomputer stops working in the sleep mode, and the current consumption of the whole sampling circuit is kept between 2.85 microamperes and 3.15 microamperes.
The inherent program of the single chip microcomputer comprises a main control module, an initialization module, an interruption module, a clock module, a counting module, a display module, a switch valve module and the like, and the main control module can effectively connect the modules in series to realize all functions of the intelligent water meter;
the counting module enables a Reed switch Reed1 and a Reed switch Reed2 to be connected to a counting pin PG5 in a time-sharing mode through switching of a control pin PG6 and a control pin PA4, and is used for recording suction times of the Reed switch Reed1 and the Reed switch Reed2 and electronic reading of the intelligent water meter respectively;
when the counting module switches the Reed1 sampling work, a low level is output through a switching control pin PG6, a power supply pin VDD, a sampling resistor R1, a counting pin PG5, a Reed1 and a control pin PG6 form a sampling circuit of the Reed1, the level state of the Reed1 is collected, and the control pin PG6 is switched to be in an input high-resistance state after sampling is finished;
when the counting module switches the Reed2 sampling work, a low level is output through a switching control pin PA4, a power supply pin VDD, a sampling resistor R1, a counting pin PG5, a Reed2 and a control pin PA4 form a sampling circuit of the Reed2, the level state of the Reed2 is collected, and the control pin PA4 is switched to be in an input high-resistance state after sampling is finished.
The counting module comprises a counter JS1 and a counter JS2, the counter JS1 is used for recording the suction times of the Reed pipe Reed1, the counter JS2 is used for recording the suction times of the Reed pipe Reed2, the JS2 is used as the electronic reading of the intelligent water meter, and the initial values of the counter JS1 and the counter JS2 are all set to be 0.
And a 100uS delay unit is further arranged in the counting module, and the delay can effectively ensure that after the Reed switch Reed1 or Reed switch Reed2 sampling circuit works stably, the actual pull-in or disconnection state of the Reed switch Reed1 or Reed switch Reed2 can be effectively reflected on the counting pin PG 5.
And a de-jitter processing unit is further arranged in the counting module, and the de-jitter processing can effectively remove uncertain states when the Reed switch Reed1 or the Reed switch Reed2 is in the critical states of attraction and disconnection, and filters out abrupt voltage on the counting pin PG 5.
By changing the delay time and the de-jitter processing, the anti-interference capability of the automatic sampling circuit can be improved, and the function of a hardware filter capacitor is realized.
Specifically, in this embodiment, the single chip microcomputer adopts model FM3316, and the working mode of the single chip microcomputer is: dormancy → sampling, cycle is reciprocal, wherein the dormancy time is far greater than the sampling time, the ratio of dormancy time and sampling time is about 1000 times, count pin PG5, control pin PG6, control pin PA4 of the one-chip computer are set as inputting the high-resistance state while sleeping, there is no current flowing on the sampling resistance R1 at this moment, therefore the automatic sampling circuit does not consume the electric current;
when JS1 is JS2, the singlechip samples Reed1, control pin PG6 is set as an output port, and outputs low level, delays 100uS and carries out dithering removing processing, so that Reed1 is in a stable working state, at this time, the singlechip can know whether Reed1 is attracted or disconnected by reading the state of counting pin PG5, the counting pin PG5 represents attracted Reed when being low level, JS1 is further added with a count, counting pin PG5 represents disconnected Reed when being high level, and after sampling of Reed1, control pin PG6 is set as an input high resistance state;
when JS1 is not equal to JS2, the singlechip samples Reed2, a control pin PA4 is set as an output port, and outputs low level, delays 100uS and carries out dithering removal processing, so that the Reed tube Reed2 is in a stable working state, at the moment, the singlechip can know whether the Reed tube Reed2 is attracted or disconnected by reading the state of a counting pin PG5, the counting pin PG5 represents attraction of the Reed tube when being low level, further counts JS2 by adding one, the counting pin PG5 represents disconnection of the Reed tube when being high level, and after the Reed tube Reed2 is sampled, the control pin PA4 is set to be in a high resistance state.
The automatic sampling circuit of this embodiment can realize low-power consumption double reed switch automatic sampling count through the automatic control of adjustment singlechip and sampling time sequence. Meanwhile, when the single chip microcomputer is used for sampling, the sampling resistor connected with the reed switch in series consumes about 3 milliamperes of current, in order to reduce the current consumption of the sampling resistor, a sleep mode is introduced, the ratio of sleep time to sampling time is about 1000 times, the reed switch sampling resistor does not consume current in the sleep mode, and thus the current consumed by the sampling resistor in the sampling period is dispersed to the sleep period and then becomes about 3 microamperes (2.85-3.15 microamperes), so that the power consumption is reduced, and the reliability of the sampling circuit is improved; the counting module in the single chip microcomputer is also provided with 100uS delay and debouncing processing, so that the effect of a hardware filter capacitor is effectively achieved, the anti-interference capability of sampling is improved, the hardware cost is reduced, and the product reliability is improved.
It should be noted that the sampling circuit of this embodiment is not only suitable for automatic sampling counting of the double reed switches, but also suitable for automatic sampling of a plurality of reed switches, and the principle of the sampling process is the same as that of the double reed switches, and only needs to set a plurality of control pins on the single chip microcomputer and add corresponding reed switches (as shown in fig. 4), and adjust the corresponding automatic control and sampling timing sequence of the single chip microcomputer.
In the present embodiment, all the related electronic elements, circuits, units, modules, and software programs may be implemented by using the prior art, and therefore, the detailed description thereof is omitted.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides an automatic sampling circuit that is used for two tongue tubes of intelligence water gauge to count which characterized in that: the device comprises a Reed tube Reed1, a Reed tube Reed2, a sampling resistor R1 and a singlechip;
the single chip microcomputer comprises a power supply pin VDD, a grounding pin VSS, a counting pin PG5, a control pin PG6 and a control pin PA 4;
one end of the sampling resistor R1 is connected with a power supply pin VDD of the single chip microcomputer, and the other end of the sampling resistor R1 is connected with a counting pin PG5 of the single chip microcomputer; the common ends of the Reed1 and the Reed2 are connected with a counting pin PG5 of the singlechip, and the other ends of the Reed1 and the Reed2 are respectively connected with a control pin PG6 and a control pin PA4 of the singlechip;
the single chip microcomputer comprises a sleep mode and a working mode, the single chip microcomputer samples and counts the output end of the double reed pipe according to a time sequence designed by software in the working mode, the single chip microcomputer stops working in the sleep mode, and the current consumption of the whole sampling circuit is kept between 2.85 microamperes and 3.15 microamperes.
2. The auto-sampling circuit of claim 1, wherein: the inherent program of the single chip microcomputer comprises a main control module and a counting module;
the counting module enables a Reed switch Reed1 and a Reed switch Reed2 to be connected to a counting pin PG5 in a time-sharing mode through switching of a control pin PG6 and a control pin PA4, and is used for recording suction times of the Reed switch Reed1 and the Reed switch Reed2 and electronic reading of the intelligent water meter respectively;
when the counting module switches the Reed1 sampling work, a low level is output through a switching control pin PG6, a power supply pin VDD, a sampling resistor R1, a counting pin PG5, a Reed1 and a control pin PG6 form a sampling circuit of the Reed1, the level state of the Reed1 is collected, and the control pin PG6 is switched to be in an input high-resistance state after sampling is finished;
when the counting module switches the Reed2 sampling work, a low level is output through a switching control pin PA4, a power supply pin VDD, a sampling resistor R1, a counting pin PG5, a Reed2 and a control pin PA4 form a sampling circuit of the Reed2, the level state of the Reed2 is collected, and the control pin PA4 is switched to be in an input high-resistance state after sampling is finished.
3. The auto-sampling circuit of claim 2, wherein: the counting module comprises a counter JS1 and a counter JS2, the counter JS1 is used for recording the suction times of the Reed pipe Reed1, the counter JS2 is used for recording the suction times of the Reed pipe Reed2, the counter JS2 is used for electronic reading as the intelligent water meter, and the initial values of the counter JS1 and the counter JS2 are 0.
4. The auto-sampling circuit of claim 2, wherein: the counting module further comprises a 100uS delay unit, and the 100uS delay unit can ensure that after the Reed switch Reed1 or Reed switch Reed2 sampling circuit works stably, the counting pin PG5 can effectively reflect the actual pull-in or off state of the Reed switch Reed1 or Reed switch Reed 2.
5. The auto-sampling circuit of claim 2, wherein: the counting module further comprises a de-jitter processing unit, and the de-jitter processing unit can remove uncertain states when the Reed switch Reed1 or the Reed switch Reed2 is in the critical state of pull-in and pull-out, and filters abrupt voltage on the counting pin PG 5.
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| CN202010329433.7A CN111474883A (en) | 2020-04-23 | 2020-04-23 | Automatic sampling circuit for counting double reed switches of intelligent water meter |
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| CN202010329433.7A CN111474883A (en) | 2020-04-23 | 2020-04-23 | Automatic sampling circuit for counting double reed switches of intelligent water meter |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441479A (en) * | 2016-11-18 | 2017-02-22 | 优艾特仪表科技成都有限公司 | Counting device for automatically controlling sampling detection of two magnetic sensors with low power consumption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441479A (en) * | 2016-11-18 | 2017-02-22 | 优艾特仪表科技成都有限公司 | Counting device for automatically controlling sampling detection of two magnetic sensors with low power consumption |
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