CN207216767U - A kind of IC-card gas meter controller based on the NB IoT communication technologys - Google Patents
A kind of IC-card gas meter controller based on the NB IoT communication technologys Download PDFInfo
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Abstract
The utility model discloses a kind of IC-card gas meter controller based on the NB IoT communication technologys, it is characterized in that, including NB IoT communication modules, valve controling circuit, photoelectric direct reading module, power management module, data storage circuitry, LCD MODULE, IC-card processing module, buzzer circuit, key circuit and control unit, wherein control unit respectively with NB IoT communication modules, valve controling circuit, photoelectric direct reading module, power management module, data storage circuitry, LCD MODULE, IC-card processing module, buzzer circuit, key circuit electrically connects, the NB IoT communication modules, valve controling circuit, photoelectric direct reading module, IC-card processing module, buzzer circuit, key circuit electrically connects with power management module respectively.The utility model has the design of power consumption, and the functions such as the remote monitoring based on the NB IoT communication technologys, remote parameter setting are realized on the basis of compatible traditional IC-card pre-payment, largely facilitate the operation management of gas company.
Description
Technical field
It the utility model is related to gas metering technical field, and in particular to a kind of IC-card based on the NB-IoT communication technologys
Gas meter controller.
Background technology
Along with the propulsion of Development of China's Urbanization and the large-scale promotion of city gas pipeline and application, for domestic resident's rank
The needs for progressively implementing to monitor gas meter, flow meter with gas company and gas consumption big data is analyzed of the policy of terraced gas price, promote to fire
Gas company is dynamic to realize the demands such as the long-range price adjustment of gas meter, flow meter, remote monitoring by the transformation of intelligent meter.Traditional IC-card
Gas meter controller change price often relies on and transmits the information such as newest price and operational factor by IC-card when user purchases gas,
It is ageing poor, disbursement and sattlement error between gas company and user is easily caused, causes unnecessary dispute.GSM/CDMA/
GPRS technologies are the technologies developed towards personal communication the last century 90's, and GSM/CDMA/GPRS technologies are in Internet of Things combustion gas
Table field has obtained applying to a certain degree, but the GSM/CDMA/GPRS Internet of Things gas meter, flow meters under prior art arrangement have cost
High, rate are expensive and net power consumption is larger the deficiencies of.
NB-IOT (arrowband honeycomb Internet of Things) focuses on low-power consumption and extensively covers (LPWA) Internet of Things (IOT) market, is a kind of
Can wide variety of emerging technology in the world.Relative to the home control network communication protocol NB-IoT technologies such as WiFi, bluetooth, GSM
With covering is wide, connection is more, speed is low, cost is low, small power consumption, the excellent feature of framework these features so that its be adapted to sense,
The field large-scale applications such as metering, detection.
The content of the invention
For the problems such as difficult, meter reading is difficult, monitoring is difficult of readjusting prices existing for existing IC-card gas meter, flow meter, the present invention uses following skill
Art solution：
A kind of IC-card gas meter controller based on the NB-IoT communication technologys, including power management module, the power supply pipe
Managing module includes built-in power circuit, external power supply circuit, DC-DC step-up/step-down circuits, external power supply detection circuit, control unit
Power-supply system VCC, NB-IoT communication module and control unit, the built-in power circuit and external power supply circuit respectively with control
Unit power-supply system VCC is connected, and the DC-DC step-up/step-down circuits are connected with NB-IoT communication modules, the external power supply
Detection circuit is connected with control unit.
Further, the external power supply circuit, including：External power supply interface, idle capacity and LDO reduction voltage circuits, outside
Put power supply and pass sequentially through external power supply input interface J1, diode D1, diode D2 and be connected with LDO reduction voltage circuits, diode
An isolation and amplifier end 6V-VCC is drawn between D1 and diode D2, the isolation and amplifier end 6V-VCC is followed by by idle capacity
Ground, the idle capacity include electric capacity E1 and electric capacity E2, and the electric capacity E1 and electric capacity E2 are grounded after being connected in series.
Further, the built-in power circuit, including：Resistance R1, diode D3, diode D4, diode D5, resistance
R2 and interface J2, built-in power are connected by diode D3 with control unit power-supply system VCC, and built-in power passes through two respectively
Pole pipe D4, diode D5 are connected with isolation and amplifier end 6V-VCC, and resistance R1 is connected with control unit, resistance R1, diode
D3, diode D4, diode D5 are connected in parallel and converge at two branch roads of extraction at point A, the point A, and a branch road is by connecing
It is grounded after mouth J2, another branch road after resistance R2 by being grounded.
Further, the DC-DC step-up/step-down circuits include DC-DC integrated chips LT3125, DC-DC integrated chip
LT3125 Enable Pin 6 is connected with control unit, DC-DC integrated chips LT3125 5 ends and power inductance L1 one end phase
Connection, the power inductance L1 other end are connected with DC-DC integrated chips LT3125 8 ends, DC-DC integrated chips LT3125's
3 ends are grounded by resistance R3, DC-DC integrated chips LT3125 1 end and 9 ends ground connection, DC-DC integrated chips LT3125 4 ends
Two branch roads are punished out, wherein a branch road is connected with isolation and amplifier end 6V-VCC, another branch road is grounded by electric capacity C2,
A point B is drawn at DC-DC integrated chips LT3125 2 ends, the point B is grounded by resistance R4, also one point C of extraction, point at point B
C is grounded by electric capacity E4, electric capacity E5, electric capacity E6 respectively again after passing sequentially through resistance R5, resistance R7, and electric capacity C3 is in parallel with electric capacity E6
Connection.
Further, the external power supply detection circuit includes resistance R6, resistance R8, resistance R9, resistance R10 and electric capacity
C4, isolation and amplifier end 6V-VCC are connected by resistance R6 with the AD ends of control unit, isolation and amplifier end 6V-VCC and resistance R6
Between draw and draw a point E between the AD ends of point a D, resistance R6 and control unit, after point D passes sequentially through resistance R8, electric capacity C4
Ground connection, point E after resistance R10 by being grounded, and the point F of extraction one, point F are grounded by resistance R9 between resistance R8 and electric capacity C4, and point F is same
When be connected with the detection of power loss end CHECK6V of control unit.
Further, in addition to NB-IoT communication modules, valve controling circuit, photoelectric direct reading module, power management module,
Data storage circuitry, LCD MODULE, IC-card processing module, buzzer circuit, key circuit and control unit, wherein controlling
Unit respectively with NB-IoT communication modules, valve controling circuit, photoelectric direct reading module, power management module, data storage circuitry,
LCD MODULE, IC-card processing module, buzzer circuit, key circuit electrical connection, the NB-IoT communication modules, valve control
Circuit processed, photoelectric direct reading module, IC-card processing module, buzzer circuit, key circuit electrically connect with power management module respectively.
Further, described control unit is single-chip microcomputer.
Further, NB-IoT wireless communication modules use SMD Internet of Things network interface card, and NB-IoT wireless communication modules pass through
UART buses are connected with the communication terminal of control unit.
Further, NB-IoT wireless communication modules select omnidirectional type spring antenna as signal transmitting and receiving antenna.
Further, IC-card processing module is connected by spi bus with microcontroller.
Compared with prior art, the present invention has following technique effect：
1st, the utility model using NB-IoT public networks realize gas meter, flow meter teledata report, ladder gas price, in real time adjust
Valency, the in real time gas company such as monitoring there is an urgent need to function, cloud service for gas company and big data analysis provide favorably
Support, largely facilitate the operation management of gas company；
2nd, the utility model is designed using micro energy lose, and microprocessor uses import low-power consumption high-speed microprocessor, dormancy power consumption
As little as 2uA；The dormancy power consumption of NB-IoT wireless modules as little as 8uA；System is by the way of NB-IoT timings upload data, simultaneously
By advanced software control algorithm, the power consumption of system is largely reduced, has that low in energy consumption, cost is low, transmission range
The characteristics of remote；
3rd, the utility model while compatible Contact Type Ic Card processing module and non-contact IC card processing module.The contact
Formulas I C cards processing module supports logic encryption card, storage card and the contact type CPU card of contact；Non-contact IC card handles mould
Block supports ISO14443A, 14443B and ISO15693 agreement of standard；It disclosure satisfy that variation of the gas company for IC-card
Demand.
Brief description of the drawings
Fig. 1 is integral module figure of the present utility model；
Fig. 2 is external power supply circuit diagram；
Fig. 3 is built-in power circuit diagram；
Fig. 4 is DC-DC step-up/step-down circuit figures；
Fig. 5 is external power supply detection circuit diagram.
The present invention is described in more detail with reference to the accompanying drawings and detailed description.
Embodiment
Gas meter controller is stable and reliable in work disclosed in the utility model, using micro energy lose design, merges NB-
IoT wireless communication technologys and IC-card pre-payment technology realize the Internet of Things application solution of gas meter terminal in one, complete
Beautiful solves the problems such as existing price adjustment of traditional IC-card gas meter, flow meter is difficult, meter reading is difficult, monitoring is difficult.The utility model possesses in timing
Pass the functions such as wireless data, long-range price adjustment, remote monitoring；The management of gas company is largely facilitated, improves combustion gas
The operating efficiency of company, reduce the maintenance cost of gas company；The utility model supports a variety of main flows such as year ladder, moon ladder
Ladder gas price scheme, ladder gas price parameter can set；Gas meter, flow meter failure active reporting function is supported, ensures that gas company can be real
When know the running status of gas meter, flow meter, guarantee gas safety.
Embodiment 1
Present embodiments provide a kind of IC-card gas meter controller based on the NB-IoT communication technologys, including power management mould
Block, the power management module include built-in power circuit, external power supply circuit, DC-DC reduction voltage circuits, external power supply detection electricity
Road and control unit power-supply system VCC, the built-in power circuit and external power supply circuit respectively with control unit power-supply system
VCC is connected, and the DC-DC step-up/step-down circuits are connected with NB-IoT communication modules, the external power supply detection circuit and control
Unit processed is connected.The dual power supply that this power-supply system uses is designed to the operation steady in a long-term of guarantee system, power supply status
Real-time detection function can remind the power supply status of user equipment in time, and power supply status parameter can be uploaded by NB-IoT modules
To remote server.
The physical circuit of external power supply circuit in power management module, such as Fig. 2, the power management module include built-in
Power circuit, external power supply circuit, DC-DC reduction voltage circuits, external power supply detection circuit and control unit power-supply system VCC, institute
State built-in power circuit and external power supply circuit respectively with control unit power-supply system VCC to be connected, the DC-DC lifts piezoelectricity
Road is connected with NB-IOT communication modules, and the external power supply detection circuit is connected with control unit.
The physical circuit of built-in power circuit in power management module, such as Fig. 3, including：Resistance R1, diode D3, two
Pole pipe D4, diode D5, resistance R2 and interface J2, built-in power are connected by diode D3 with control unit power-supply system VCC
Connect, built-in power is connected by diode D4, diode D5 with isolation and amplifier end 6V-VCC respectively, resistance R1 and control unit
It is connected, resistance R1, diode D3, diode D4, diode D5, which are connected in parallel and converged at, draws two at point A, the point A
Branch road, a branch road after interface J2 by being grounded, and another branch road after resistance R2 by being grounded.Built-in power is by isolating two poles
Pipe D3 is connected with system main power source VCC；Pass through double isolating diode D4, D5 and external power supply isolation and amplifier end 6V-VCC phases
Even, ensure external power supply power down when, DC-DC save reduction voltage circuit can normal work, single two pole can be reduced using double diode
The electric current of pipe, so as to reduce the pressure drop of diode, lift power drives ability.Built-in power passes through current-limiting resistance R1 and microcontroller
The built-in power detection port of device is connected, and system can detect the state of built-in power power down in real time, and triggering power down alarm uploads；
Built-in power uses the battery-powered scheme of high-energy lithium battery, and it is defeated that built-in power circuit is also serially connected with built-in power including discharge resistance R2
Enter between power supply ground, the function of the resistance is to prevent lithium battery passivation phenomenon.
The physical circuit of DC-DC step-up/step-down circuits in power management module, such as Fig. 4, the DC-DC step-up/step-down circuits bag
The Enable Pin 6 for including DC-DC integrated chips LT3125, DC-DC integrated chip LT3125 is connected with control unit, and DC-DC is integrated
Chip LT3125 5 ends are connected with power inductance L1 one end, power inductance the L1 other end and DC-DC integrated chips
LT3125 8 ends are connected, and DC-DC integrated chips LT3125 3 ends are grounded by resistance R3, DC-DC integrated chips LT3125
1 end and 9 ends ground connection, two branch roads are punished out at DC-DC integrated chips LT3125 4 ends, wherein a branch road and isolation and amplifier
End 6V-VCC is connected, and another branch road is grounded by electric capacity C2, and a point B is drawn at DC-DC integrated chips LT3125 2 ends,
The point B is grounded by resistance R4, and a point C is also drawn at point B, and point C passes through electricity respectively again after passing sequentially through resistance R5, resistance R7
Hold E4, electric capacity E5, electric capacity E6 ground connection, electric capacity C3 is connected in parallel with electric capacity E6.
The physical circuit of external power supply detection circuit in power management module, such as Fig. 5, the external power supply detect circuit
Including resistance R6, resistance R8, resistance R9, resistance R10 and electric capacity C4, isolation and amplifier end 6V-VCC passes through resistance R6 and control unit
AD ends be connected, between the AD ends that point a D, resistance R6 and control unit are drawn between isolation and amplifier end 6V-VCC and resistance R6
A point E is drawn, point D is grounded after passing sequentially through resistance R8, electric capacity C4, and point E after resistance R10 by being grounded, resistance R8 and electric capacity C4
Between draw a point F, point F is grounded by resistance R9, and point F is connected with the detection of power loss end CHECK6V of control unit simultaneously, anti-
Only because supply voltage shake causes system power state to judge by accident.
Embodiment 2
The present embodiment is on the basis of embodiment 1, such as Fig. 1, in addition to NB-IoT communication modules, valve controling circuit, light
Photoelectric direct reading module, power management module, data storage circuitry, LCD MODULE, IC-card processing module, buzzer circuit, press
Key circuit and control unit, wherein control unit respectively with NB-IoT communication modules, valve controling circuit, photoelectric direct reading module,
Power management module, data storage circuitry, LCD MODULE, IC-card processing module, buzzer circuit, key circuit are electrically connected
Connect, the NB-IoT communication modules, valve controling circuit, photoelectric direct reading module, IC-card processing module, buzzer circuit, button
Circuit electrically connects with power management module respectively.
Described control unit can use any microcontroller of the prior art, such as single-chip microcomputer, what the present embodiment can be adopted
It is the single-chip microcomputer R7F0C019 of high-performance micro energy lose.
NB-IoT wireless communication modules use SMD Internet of Things network interface card, NB-IoT wireless communication modules by UART buses with
The communication terminal of microcontroller is connected.As a kind of embodiment, NB-IoT wireless communication modules include integrated circuit SARA-
N200, the Internet of Things SIM card of paster type encapsulation are directly welded on circuit board.NB-IoT wireless communication modules select omnidirectional type bullet
Spring antenna is as signal transmitting and receiving antenna.
Key circuit is used to trigger push button signalling, and when microcontroller detects push button signalling, liquid is controlled according to push button signalling
Brilliant display module shows corresponding information.As a kind of embodiment, key circuit includes button, pull-up resistor and filter capacitor,
Push button signalling normality is high level.Microcontroller controls liquid crystal display mode according to the triggering times and triggering duration of push button signalling
Block shows the operational factors such as accumulative gas consumption, current unit price, remaining sum.Further, when being more than 3s by long-press button
Between, microprocessor control NB-IoT wireless communication modules can be triggered and open and upload a wireless communication data in real time, uploaded
After the completion of data, microprocessor control NB-IoT wireless communication modules work on a period of time come receive come from NB-IoT without
The downlink data of line communication network.
The photoelectric direct reading module uses transmission type photoelectric direct access mode, reads the numeral of gas meter, flow meter, and photo-electronic directly reading counts
Module is using UART communication protocols transmission direct-reading reading.
The valve controling circuit includes valve driving circuit and reverse impulse eliminates circuit；The input of valve control module
End is connected with microcontroller, and output end is connected with the valve of gas meter, flow meter.As a kind of embodiment, described valve driving electricity
Road uses integrated circuit MS8837, and reverse impulse, which eliminates circuit, includes filter capacitor and reverse impulse suppression diode.
The IC-card processing module is connected by spi bus with microcontroller.IC-card processing module can be contact IC
Card processing module, the Contact Type Ic Card processing module support logic encryption card, storage card and the contact type CPU of contact
Card.It can also be non-contact IC card processing module, support ISO14443A, 14443B and ISO15693 agreement of standard.Institute
State microprocessor unit and IC-card processing unit is connected by spi bus.
Data memory module includes memory AT24C256, AT24C256 and passes through I2The communication of C buses and microcontroller
End is connected, memory AT24C256 be used for the operational factor of storage control, nearly 60 days with destiny evidence and use in monthly, 10
Destiny according to etc..
LCD MODULE is made up of Liquid Crystal Module and liquid crystal display drive circuit, and Liquid Crystal Module selects low-power consumption LCD liquid crystal, liquid
The liquid crystal drive port of crystalline substance connection microcontroller, is driven by microcontroller and controls the working condition of LCD MODULE.
Operation principle：
During utility model works, microcontroller triggers according to the button of system real time execution state modulator gas meter, flow meter, number
According to the event handling such as metering, NB-IoT wireless data processings, valve switch, IC-card read-write card, liquid crystal display.System operation
In, usually in a dormant state, microcontroller is according to the timing uplink time of systemic presupposition and week for NB-IoT wireless communication modules
Phase, when reaching the timing acquiring gas time, control NB-IoT wireless communication modules are opened and uploaded uses destiny evidence and combustion in real time
Gas meter running state information.Microcontroller can automatically turn on when detecting the failures such as the low electricity of system power supply, metering exception, power down
NB-IoT wireless communication modules and the current running state information of uploading system, realize gas meter, flow meter failure real-time report function.It is micro-
Controller can control NB-IoT wireless communication modules to upload IC-card processing data when having handled user in the event of inserting, and ensure remote
The uniformity of range monitoring system and IC data.
For NB-IoT wireless communication modules in the state of parallel-connection network is opened, system, which can be received and handled, comes from management system
Unite issue long-range price adjustment, remotely purchase gas, long-range Valve controlling, operational factor inquiry etc. data, complete the response of remote command.
Microcontroller, according to touch potential and the use gas data cases of time showing user, is realized man-machine when detecting actuation of keys
The function of real-time, interactive；When long during button (key press time is more than 3s), microcontroller starts NB-IoT wireless communication modules in real time
And upload and once use destiny evidence, after data upload successfully, microprocessor control NB-IoT modules work on a period of time, complete
The data interactions such as the remote control between host computer.
Claims (10)
1. a kind of IC-card gas meter controller based on the NB-IoT communication technologys, it is characterised in that including power management module, institute
State power management module include built-in power circuit, external power supply circuit, DC-DC step-up/step-down circuits, external power supply detection circuit,
Control unit power-supply system VCC, NB-IoT communication module and control unit, built-in power circuit and the external power supply circuit point
It is not connected with control unit power-supply system VCC, the DC-DC step-up/step-down circuits are connected with NB-IoT communication modules, described
External power supply detection circuit is connected with control unit.
2. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 1, it is characterised in that described outer
Power circuit is put, including：External power supply interface, idle capacity and LDO reduction voltage circuits, it is defeated that external power supply passes sequentially through external power supply
Incoming interface J1, diode D1, diode D2 are connected with LDO reduction voltage circuits, between diode D1 and diode D2 draw one every
From output end 6V-VCC, for the isolation and amplifier end 6V-VCC by being grounded after idle capacity, the idle capacity includes electric capacity E1
It is grounded with electric capacity E2, the electric capacity E1 and electric capacity E2 after being connected in series.
3. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 2, it is characterised in that in described
Power circuit is put, including：Resistance R1, diode D3, diode D4, diode D5, resistance R2 and interface J2, built-in power pass through
Diode D3 is connected with control unit power-supply system VCC, and built-in power is defeated with isolating by diode D4, diode D5 respectively
Go out to hold 6V-VCC to be connected, resistance R1 is connected with control unit, and resistance R1, diode D3, diode D4, diode D5 are in parallel
Connect and converge at two branch roads of extraction at point A, the point A, by being grounded after interface J2, another branch road passes through a branch road
It is grounded after resistance R2.
4. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 3, it is characterised in that described
DC-DC step-up/step-down circuits include DC-DC integrated chips LT3125, DC-DC integrated chip LT3125 Enable Pin 6 and control unit
Be connected, DC-DC integrated chips LT3125 5 ends are connected with power inductance L1 one end, the power inductance L1 other end with
DC-DC integrated chips LT3125 8 ends are connected, and DC-DC integrated chips LT3125 3 ends are grounded by resistance R3, DC-DC collection
It is grounded into chip LT3125 1 end and 9 ends, two branch roads are punished out at DC-DC integrated chips LT3125 4 ends, wherein a branch
Road is connected with isolation and amplifier end 6V-VCC, and another branch road is grounded by electric capacity C2, DC-DC integrated chips LT3125 2 ends
A point B is drawn at place, and the point B is grounded by resistance R4, also one point C of extraction at point B, after point C passes sequentially through resistance R5, resistance R7
It is grounded respectively by electric capacity E4, electric capacity E5, electric capacity E6 again, electric capacity C3 is connected in parallel with electric capacity E6.
5. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 4, it is characterised in that described outer
Putting power sense circuit includes resistance R6, resistance R8, resistance R9, resistance R10 and electric capacity C4, and isolation and amplifier end 6V-VCC passes through electricity
Resistance R6 is connected with the AD ends of control unit, and point a D, resistance R6 and control are drawn between isolation and amplifier end 6V-VCC and resistance R6
A point E is drawn between the AD ends of unit, point D is grounded after passing sequentially through resistance R8, electric capacity C4, point E by being grounded after resistance R10,
A point F is drawn between resistance R8 and electric capacity C4, point F is grounded by resistance R9, point F while the detection of power loss end with control unit
CHECK6V is connected.
6. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 1, it is characterised in that also include
NB-IoT communication modules, valve controling circuit, photoelectric direct reading module, power management module, data storage circuitry, liquid crystal display mode
Block, IC-card processing module, buzzer circuit, key circuit and control unit, wherein control unit communicate mould with NB-IoT respectively
Block, valve controling circuit, photoelectric direct reading module, power management module, data storage circuitry, LCD MODULE, IC-card processing
Module, buzzer circuit, key circuit electrical connection, the NB-IoT communication modules, valve controling circuit, photoelectric direct reading module,
IC-card processing module, buzzer circuit, key circuit electrically connect with power management module respectively.
7. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 6, it is characterised in that the control
Unit processed is single-chip microcomputer.
8. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 6, it is characterised in that NB-IoT
Wireless communication module uses SMD Internet of Things network interface card, the communication that NB-IoT wireless communication modules pass through UART buses and control unit
End is connected.
9. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 6, it is characterised in that NB-IoT
Wireless communication module selects omnidirectional type spring antenna as signal transmitting and receiving antenna.
10. the IC-card gas meter controller based on the NB-IoT communication technologys as claimed in claim 6, it is characterised in that IC-card
Processing module is connected by spi bus with microcontroller.
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| CN110636469A (en) * | 2018-06-22 | 2019-12-31 | 辽宁思凯科技股份有限公司 | Direct-reading gas meter based on NB-IOT modem |
| CN108986323A (en) * | 2018-06-25 | 2018-12-11 | 安徽鸿凌机电仪表(集团)有限公司 | Pre-payment Internet of Things gas meter, flow meter with IC card |
| CN108694425A (en) * | 2018-07-24 | 2018-10-23 | 绵阳市绵州通有限责任公司 | IC card mobile read-write device based on internet of things |
| CN109523768A (en) * | 2018-08-23 | 2019-03-26 | 杭州乾程弘泰电力科技有限公司 | A kind of communication base station antenna assembly |
| CN110954156A (en) * | 2018-09-26 | 2020-04-03 | 辽宁思凯科技股份有限公司 | Volume correction instrument based on narrow-band Internet of things NB-IOT data communication technology |
| CN109900337A (en) * | 2019-03-04 | 2019-06-18 | 湖北楚航电子科技有限公司 | A kind of gas meter, flow meter based on narrowband Internet of Things |
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