CN100347524C - Wireless and passive water meter and gas meter - Google Patents
Wireless and passive water meter and gas meter Download PDFInfo
- Publication number
- CN100347524C CN100347524C CNB2005100497354A CN200510049735A CN100347524C CN 100347524 C CN100347524 C CN 100347524C CN B2005100497354 A CNB2005100497354 A CN B2005100497354A CN 200510049735 A CN200510049735 A CN 200510049735A CN 100347524 C CN100347524 C CN 100347524C
- Authority
- CN
- China
- Prior art keywords
- circuit
- water meter
- meter
- gas meter
- chip microcomputer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention discloses a wireless and passive water meter and gas meter, which comprises an intelligent water meter, an intelligent gas meter and a main station for recording the water meter and the gas meter. Absolute codes are carved on mechanical character wheels of the intelligent water meter and the intelligent gas meter, both sides of the mechanical character wheels of the water meter and the gas meter are provided with infrared sending and receiving tubes, and wireless electric wave receiving and modulating circuits are arranged in the water meter and the gas meter which are not connected with power sources. The main station is a wireless electric wave sending and receiving circuit. The present invention has the advantages that the absolute coding is carried out on the same circumference of the character wheels, which occupies less area and is easy to process, the intellectual water meter and the intellectual gas meter are simultaneously provided with mechanical reading numbers and electronic reading numbers which are fully identical, an electronic reading device does not influence the measuring accuracy of original primary meters, the intellectual water meter and the intellectual gas meter are not externally connected with power lines so as to be easy to seal, and the data exchange between the main station and the intelligent water and gas meters is realized by a wireless communication mode without externally connected signal lines so as to be easy to record.
Description
Technical field
The present invention relates to the measurement of volume, flow, mass rate or liquid level, relate in particular to a kind of wireless and passive water meter and gas meter.
Background technology
Current, proposed a series of water meters with teletransmission function, gas meter etc. (family with) instrument, wherein a kind of is to carry out digitized processing by the pulsed counting, promptly, adopt effects such as light, magnetic to produce the pulsed electric signal for a certain rotary machine, reading adds up out.There are some shortcomings in this method:
(1) mechanical reading and electronical reading, often disunity is easy to generate dispute;
(2) electronic impulse error for good and all is accumulated among the result;
(3) measuring system of electronic impulse must a direct power supply.
So the passive remote transmitting water meter of bus type, gas meter have been proposed, at ordinary times need not be to instrument power supply, in the time of need checking meter just by bus to instrument power supply.The shortcoming of the passive remote transmitting water meter of this bus type (gas meter etc.) is, must be during work by external power source by bus to instrument power supply, be unfavorable for sealing, inconvenient operation, even in some use occasion, wiring is difficulty very, as buried underground water meter, gas meter copy reading.Even can connect up, in abominable wet environment, electrical contact is easy to be corroded, wears out.The present invention can avoid these shortcomings, and main website adopts radiowave non-contact power supply mode, and circuit such as water meter, gas meter and antenna thereof can be sealed fully, do not reveal any electrical contact, need not powered battery, and can wireless copy reading.
Radio frequency (RFID) card technique radiowave simultaneously as electric energy transmitting and data transmission channel, but rfid card does not provide interface microcontroller, so, rfid interrogator can not with single-chip microcomputer swap data in water meter, the gas meter.The present invention just this radio-frequency technique, is designed into water meter, gas meter Automatic meter reading system.
Summary of the invention
The purpose of this invention is to provide a kind of wireless and passive water meter and gas meter.
Wireless and passive water meter and gas meter have their main website of intellectual water meter, gas meter and copy reading thereof, intellectual water meter, gas meter are to be carved with absolute encoding on the mechanical character wheel of water meter, gas meter, the infrared emission receiving tube is installed in mechanical character wheel both sides at water meter, gas meter, radiowave is installed in water meter, gas meter receives and modulation circuit, main website is radio wave transmission and receiving circuit.
Radiowave in water meter, the gas meter receives and modulation circuit is: the two ends and the regulator rectifier circuit of coil L2, capacitor C 2 and metal-oxide-semiconductor R2 parallel connection join, the voltage end of regulator rectifier circuit output and the power end of single-chip microcomputer join, one end and gap detection circuit, the clock signal extracting circuit of coil L2, capacitor C 2 and metal-oxide-semiconductor R2 parallel connection join, link single-chip microcomputer more respectively, metal-oxide-semiconductor R2 grid joins with load-modulate circuit, single-chip microcomputer successively, and single-chip microcomputer joins with infrared transmitting tube circuit, infrared receiving tube circuit.
Radio wave transmission and receiving circuit in the main website are: join with demodulator circuit, low-pass filter circuit, amplifying circuit, schmidt trigger circuit, single-chip microcomputer successively after coil L1 one end and capacitor C 1 one ends join, single-chip microcomputer joins with NAND gate circuit, push-pull driver circuit successively, push-pull driver circuit joins with capacitor C 1 other end, resistance R 1 one ends respectively, resistance R 1 other end and the coil L1 other end join, crystal oscillating circuit and NAND gate circuit are joined, and single-chip microcomputer and power supply, serial communication RS232 circuit join.
Absolute encoding is: carry out 0,1 absolute type loop coding on the same circumference of mechanical character wheel, by 18 degree uniform encodings, totally 20, the place of hollow out is designated 1, does not have the place of hollow out to be designated 0.
The infrared photocell recognition coding is: 5 pairs of transmit-receive tubes are installed at least, 5 receiving tubes of 6 power valves perhaps are installed, 5 receiving tubes of 7 power valves perhaps are installed, 6 receiving tubes of 5 power valves perhaps are installed, 7 receiving tubes of 5 power valves perhaps are installed.
The position of infrared photocell is: by the equidistant installation of 18 degree, power valve and receiver pope or on same angle perhaps misplace and 18 spend.
Beneficial effect of the present invention:
1) carry out absolute encoding on the same circumference of character wheel, area occupied is few, easily processing;
2) intellectual water meter, gas meter have mechanical reading and electronical reading simultaneously, and keep in full accord; The electronical reading device does not influence the measuring accuracy of original primary instrument;
3) intellectual water meter, gas meter do not have circumscripted power line, easily sealing;
4) pass through the communication swap data between main website and intellectual water meter, the gas meter, do not have the outer signal line, copy reading is convenient.
Description of drawings
Fig. 1 be main website with water meter, gas meter between wireless power and the synoptic diagram of communicating by letter;
Fig. 2 is 20 coding synoptic diagram of character wheel;
Fig. 3 is character wheel and infrared transmitting tube receiving tube scheme of installation;
Fig. 4 is the radius (synoptic diagram of radius=5mm, diameter=10mm) of character wheel hollow out circumference;
Fig. 5 is infrared transmitting tube and receiving tube welding position synoptic diagram;
Fig. 6 is a wireless transmit receiving lines synoptic diagram in the main website;
Fig. 7 is a wireless transmit modulation conspectus in water meter, the gas meter.
Embodiment
The method of identification character wheel reading of the present invention is: be to carry out 0,1 absolute type loop coding on the same line on the same circumference of mechanical character wheel, by 18 degree uniform encodings, totally 20, a position of each corresponding character wheel of encoding, the place of hollow out is designated 1, does not have the place of hollow out to be designated 0.And, 5 receiving tubes of 6 power valves are installed perhaps in that infrared emission receiving tube more than 5 pairs is installed on the relevant position, and 5 receiving tubes of 7 power valves perhaps are installed, 6 receiving tubes of 5 power valves perhaps are installed, 7 receiving tubes of 5 power valves perhaps are installed.Infrared receiving tube or export 0,1 digital signal is perhaps exported simulating signal, after 8 A/D samplings, with threshold comparison, judges output 0,1 coding, thus the current reading of identification character wheel.
The method of wireless power and copy reading is: send radio magnetic wave by main website to water meter, gas meter, electromagnetic wave induces voltage by the antenna coupling to water meter, gas meter, water meter, gas meter convert the power level that needs to by rectification, mu balanced circuit, at this moment, single-chip microcomputer in water meter, the gas meter begins operate as normal, detect the coding of character wheel, the reading of identification character wheel, water meter, gas meter transmit data by the regulating load size to main website.Main website transmits data by regulating radiowave gap (being the amplitude size) to water meter, gas meter,
Because water meter, gas meter do not have the externally fed power supply,, discern mechanical reading by the method for identification mechanical character wheel so a base table adopts stem-winder.The gordian technique of mechanical character wheel electronic digitalizing method is the absolute encoding method of character wheel, comprises two aspect contents, (1) absolute encoding method on the same circumference of character wheel; (2) setting angle of sensor and detection method.
In order correctly to discern 10 numerals such as 0,1,2,3,4,5,6,7,8,9 of character wheel, in the time of will noticing that especially the low level character wheel is from 9 to 0 rotation processes, high place reading also is in critical localisation.So we need to discern 20 positions at least, comprise the position of 10 numerals such as 0 to 9 grade and the critical localisation between 10 numerals thereof.The position of identification is many more, and precision is high more, and the sensor that needs is also just many more, and cost is just high more.So we only discern 20 positions and get final product.
As Fig. 2, these 20 positions are called 0,09,9,98,8,87,7,76,6,65,5,54,4,43,3,32,2,21,1,10 respectively, and wherein 0 represents digital 0 center position, the critical localisation between the 09 expression numeral 9 and 0.These 20 positions are evenly cut apart, and each position accounts for 18 degree.
With 1,0 positions of representing certain 18 degree hollow out whether, the radius of hollow out circumference is 5mm, as shown in Figure 4. Coding 0,0,0,1,1,1,1,1,0,1,0,1,1,1,0,0,0,1,0,0 expression, the position of hollow out has: 21,2,32,3,43; 54; 65,6,76; 98; Totally 4 holes, as shown in Figure 4.
Other coding has,
(1)0，1，0，1，0，0，0，0，0，1，1，0，0，0，1，0，1，1，1，1；
(2)0，1，1，1，1，0，1，0，1，0，0，0，1，1，0，0，0，0，0，1；
(3)0，1，1，0，1，0，1，0，0，0，0，0，1，1，1，0，0，0，1，0；
(4)0，0，0，0，0，1，0，1，0，0，1，0，0，0，1，1，0，1，1，1；
(5)0，1，0，1，1，1，0，1，0，0，1，0，0，0，1，1，0，0，0，0；
(6)1，0，0，1，0，1，0，1，1，0，0，0，0，0，1，0，0，1，1，1；
(7)1，0，1，0，0，0，1，0，1，0，1，1，1，1，0，0，0，0，0，1；
(8)0，0，0，0，1，0，1，1，0，1，0，0，1，1，1，1，0，0，1，0；
(9)1，0，0，1，0，1，0，1，1，0，0，0，0，0，1，1，0，1，1，1；
(10)0，1，1，1，1，0，1，0，0，0，1，0，1，0，1，1，0，0，0，0；
(11)0，1，1，0，1，0，1，0，0，1，1，1，1，0，1，1，0，0，0，0；
(12)1，1，1，1，0，1，0，0，1，0，1，1，0，0，0，0，0，1，1，0；
(13)0，0，0，0，0，1，0，1，1，1，1，1，0，1，0，1，0，0，1，1；
(14)1，0，0，1，0，1，0，1，1，0，0，0，0，1，0，0，1，1，1，1；
(15)1，0，0，1，0，1，0，1，1，0，0，0，0，1，1，0，1，1，1，1；
(16)1，0，0，0，0，0，1，0，1，0，1，1，1，1，1，0，0，1，1，0；
(17)1，0，1，0，0，0，1，0，1，0，1，1，1，1，1，0，0，0，0，1；
(18)1，0，1，0，0，0，0，1，0，1，0，1，1，1，0，0，1，1，1，1；
(19)1，1，0，1，0，0，0，1，0，1，1，0，1，1，1，0，0，1，1，1；
(20)1，0，0，1，1，0，1，1，1，1，1，0，1，0，1，0，0，0，0，0；
(21)1，1，1，1，1，0，1，0，0，0，1，0，1，0，1，1，0，0，0，0；
(22)0，0，0，0，0，1，1，1，0，1，0，1，1，1，1，1，0，0，0，1；
(23)0，1，0，0，0，0，0，1，1，1，0，1，1，1，1，1，0，0，0，1；
(24)0，1，1，1，1，1，0，0，1，0，0，0，1，1，0，0，0，0，0，1；
(25) 0,1,1,1,1,1,0,0,0,1,1,0,0,1,0,0,0,0,0,1; Or the like.
The characteristics of these codings are that the arc of hollow out is 4 sections or 5 sections that are separated by; Continuous 0 or 1 number is no more than 5.These codings through negates, left and right sidesing shifting, about operation such as exchange, its result also is suitable for.
In the both sides of character wheel the infrared emission receiving tube is installed then, as shown in Figure 3.Infrared ray can pass the position of hollow out, and the signal of receiving tube output is made as high level; For the position that does not have hollow out, the signal of receiving tube output is made as low level.The output of all receiving tubes has determined a coding of this character wheel, has determined a corresponding angle, has also determined the numeral that view directions is seen.
The coding case study on implementation:
Coding is 0,0,0,1,1,1,1,1,0,1,0,1,1,1,0,0,0,1,0,0.The position of hollow out has: 21,2,32,3,43; 54; 65,6,76; 98; Totally 4 holes.Wiring board on the circumference of diameter 10mm, is installed 7 pairs of infrared emission receiving tubes as shown in Figure 5, and power valve, receiving tube adopt 0603 encapsulation, at interval 18 degree.
Character wheel when needing teletransmission, can be discerned by single-chip microcomputer after realizing absolute encoding easily.The purpose of invention absolute encoding is as Fig. 1, to be made of the remote transmitting system of a number rice distance base table, main website, computing machine.Base table and main website both can be the One-to-one communication modes, also can be the communication modes of one-to-many.
The course of work of main website is, as shown in Figure 6, radio wave transmission and receiving circuit are: after coil L1 one end and capacitor C 1 one ends join successively with demodulator circuit, low-pass filter circuit, amplifying circuit, schmidt trigger circuit, single-chip microcomputer joins, single-chip microcomputer successively with NAND gate circuit, push-pull driver circuit joins, push-pull driver circuit respectively with capacitor C 1 other end, resistance R 1 one ends join, resistance R 1 other end and the coil L1 other end join, crystal oscillating circuit and NAND gate circuit are joined, single-chip microcomputer and serial communication RS232 circuit join, and it is other circuit supplies such as single-chip microcomputer that a power supply is arranged.
Crystal oscillator output 100kHZ～150kHz signal, drive a coil (L1C1) oscillatory circuit through recommending, the data of single-chip microcomputer output are by Sheffer stroke gate, the control oscillation circuit gap that quits work, be Modulation and Amplitude Modulation, the electric wave of emission is coupled to intellectual water meter, gas meter.On the other hand, from the electric wave that receives, demodulate the signal that comes from intellectual water meter, gas meter emission, through low-pass filtering, amplification, schmidt trigger, as the input signal of single-chip microcomputer.
As Fig. 6, the example of L1C1 is L1=1.35mH, C1=1.2nF, R1=82 Ω.This moment, resonance frequency was 125kHz.Single-chip microcomputer can adopt the MSP430F123 low-power scm of Ti company.
Intellectual water meter, the course of work of gas meter is, as shown in Figure 7, water meter, radiowave in the gas meter receives and modulation circuit is: coil L2, the two ends and the regulator rectifier circuit of capacitor C 2 and metal-oxide-semiconductor R2 parallel connection join, the voltage end of regulator rectifier circuit output and the power end of single-chip microcomputer join, coil L2, one end and the gap detection circuit of capacitor C 2 and metal-oxide-semiconductor R2 parallel connection, clock signal extracting circuit joins, link single-chip microcomputer more respectively, metal-oxide-semiconductor R2 grid successively with the load-modulate circuit, single-chip microcomputer joins, single-chip microcomputer and infrared transmitting tube circuit, the infrared receiving tube circuit joins.This radiowave receives and modulation circuit does not connect external power source (battery), provides working power by regulator rectifier circuit.
After wire loop in intellectual water meter, the gas meter (L2C2 loop) is coupled to electric wave, provide power supply through overcommutation, voltage stabilizing for entire circuit on the one hand, simultaneously, single-chip microcomputer detects the oscillation clearance in the L2C2 loop, thereby identifies from the next data of main website emission; On the other hand, single-chip microcomputer adopts load-modulate by control metal-oxide-semiconductor R2, gives main website data transmission.
As Fig. 7, the example of L2C2 is L2=1.35mH, C2=1.2nF.This moment, resonance frequency was 125kHz.Single-chip microcomputer can adopt the MSP430F1121 low-power scm of Ti company.
Claims (3)
1. wireless and passive water meter, it is characterized in that, it has intellectual water meter and their main website of copy reading thereof, intellectual water meter is to be carved with absolute encoding on the mechanical character wheel of water meter, the infrared emission receiving tube is installed in mechanical character wheel both sides at water meter, radiowave is installed in water meter to be received and modulation circuit, main website is radio wave transmission and receiving circuit, radiowave in the water meter receives and modulation circuit is: coil L2, the two ends and the regulator rectifier circuit of capacitor C 2 and metal-oxide-semiconductor R2 parallel connection join, the voltage end of regulator rectifier circuit output and the power end of single-chip microcomputer join, coil L2, one end and the gap detection circuit of capacitor C 2 and metal-oxide-semiconductor R2 parallel connection, clock signal extracting circuit joins, link single-chip microcomputer more respectively, metal-oxide-semiconductor R2 grid successively with the load-modulate circuit, single-chip microcomputer joins, single-chip microcomputer and infrared transmitting tube circuit, the infrared receiving tube circuit joins.
2. a kind of wireless and passive water meter according to claim 1, it is characterized in that radio wave transmission and receiving circuit in the said main website are: after coil L1 one end and capacitor C 1 one ends join successively with demodulator circuit, low-pass filter circuit, amplifying circuit, schmidt trigger circuit, single-chip microcomputer joins, single-chip microcomputer successively with NAND gate circuit, push-pull driver circuit joins, push-pull driver circuit respectively with capacitor C 1 other end, resistance R 1 one ends join, resistance R 1 other end and the coil L1 other end join, crystal oscillating circuit and NAND gate circuit are joined, single-chip microcomputer and power supply, serial communication RS232 circuit joins.
3. a kind of wireless and passive water meter according to claim 1, it is characterized in that said absolute encoding is: on the same circumference of mechanical character wheel, carry out 0,1 absolute type loop coding, by 18 degree uniform encodings, totally 20, the place of hollow out is designated 1, does not have the place of hollow out to be designated 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100497354A CN100347524C (en) | 2005-04-30 | 2005-04-30 | Wireless and passive water meter and gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100497354A CN100347524C (en) | 2005-04-30 | 2005-04-30 | Wireless and passive water meter and gas meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1687716A CN1687716A (en) | 2005-10-26 |
| CN100347524C true CN100347524C (en) | 2007-11-07 |
Family
ID=35305758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100497354A Expired - Fee Related CN100347524C (en) | 2005-04-30 | 2005-04-30 | Wireless and passive water meter and gas meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100347524C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342221C (en) * | 2005-12-01 | 2007-10-10 | 上海交通大学 | Pure passive wireless automatic meter recording system using sound surface wave technology |
| CN1945218B (en) * | 2006-10-25 | 2010-05-12 | 杭州水表有限公司 | Coder for remote transmitting direct reading water meter |
| CN100422693C (en) * | 2006-10-31 | 2008-10-01 | 浙江大学 | Single ring coded directly reading type radio remote transmitting water meter |
| CN102589632B (en) * | 2012-03-02 | 2013-07-10 | 浙江威星智能仪表股份有限公司 | Dial switch type passive direct-reading circuit for gas meters |
| CN102589631B (en) * | 2012-03-02 | 2013-07-10 | 浙江威星智能仪表股份有限公司 | Variable resistance type passive direct-reading circuit for gas meters |
| CN102938084B (en) * | 2012-11-29 | 2016-08-24 | 深圳市华旭科技开发有限公司 | The reading/writing method of the low-frequency radio frequency card of intellectual water meter and circuit |
| CN103869738B (en) * | 2014-04-01 | 2016-03-23 | 山东潍微科技股份有限公司 | A kind of passive meter reading counting assembly |
| CN104482977A (en) * | 2014-12-05 | 2015-04-01 | 柳州市联达科技有限公司 | No built-in battery and wireless reading water meter |
| CN106327844A (en) * | 2016-11-23 | 2017-01-11 | 合肥学院 | Wireless meter reading system of power-free water meter |
| CN106767990B (en) * | 2017-01-18 | 2023-02-28 | 莱芜欧利电子有限公司 | Counter for passive high-frequency induction direct-reading metering device |
| CN112185094A (en) * | 2020-09-29 | 2021-01-05 | 云南卓烁科技有限公司 | Wireless meter reading device suitable for ground well pit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4940976A (en) * | 1988-02-05 | 1990-07-10 | Utilicom Inc. | Automated remote water meter readout system |
| CN2135142Y (en) * | 1992-08-25 | 1993-06-02 | 山西统配煤矿高新技术产业总公司 | Remote-indicating device for gasmeter reading |
| CN2565000Y (en) * | 2002-09-07 | 2003-08-06 | 罗伟 | Intelligent water-meter capable of wireless copying and reading prepayment |
| CN1439865A (en) * | 2003-03-20 | 2003-09-03 | 江苏爱达数码科技有限公司 | Automatic data collecting systems |
| CN1529129A (en) * | 2003-10-08 | 2004-09-15 | 浙江大学 | Mechanical character wheel electronic digitalizing method and its passive automatic meter-reading system |
| CN2694234Y (en) * | 2003-10-08 | 2005-04-20 | 浙江大学 | Automatic meter reading system without power supply |
-
2005
- 2005-04-30 CN CNB2005100497354A patent/CN100347524C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4940976A (en) * | 1988-02-05 | 1990-07-10 | Utilicom Inc. | Automated remote water meter readout system |
| CN2135142Y (en) * | 1992-08-25 | 1993-06-02 | 山西统配煤矿高新技术产业总公司 | Remote-indicating device for gasmeter reading |
| CN2565000Y (en) * | 2002-09-07 | 2003-08-06 | 罗伟 | Intelligent water-meter capable of wireless copying and reading prepayment |
| CN1439865A (en) * | 2003-03-20 | 2003-09-03 | 江苏爱达数码科技有限公司 | Automatic data collecting systems |
| CN1529129A (en) * | 2003-10-08 | 2004-09-15 | 浙江大学 | Mechanical character wheel electronic digitalizing method and its passive automatic meter-reading system |
| CN2694234Y (en) * | 2003-10-08 | 2005-04-20 | 浙江大学 | Automatic meter reading system without power supply |
Non-Patent Citations (2)
| Title |
|---|
| 掌上电脑在智能小区自动抄表系统中的应用 杜雪亮，戴华平.自动化仪表，第25卷第8期 2004 * |
| 无源自动抄表系统及其关键技术研究 戴华平，李志明.自动化与仪表，第2期 2004 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1687716A (en) | 2005-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100347524C (en) | Wireless and passive water meter and gas meter | |
| CN1619572A (en) | Loop coil antenna and reader/writer | |
| CN102484469B (en) | Improved modulation and demodulation circuit | |
| CN104158269A (en) | Wireless charging transmitter, receiver, charging device and wireless charging method | |
| CN103456156A (en) | Long-distance passive wireless sensor remote-measuring system with working frequency adjustable | |
| CN105072585A (en) | Beidou navigation-based refrigerator car intelligent monitoring cloud terminal device | |
| CN104655340B (en) | Torque sensor module based on wireless power supplying and wireless signal transmission | |
| CN203422127U (en) | Photoelectricity direct reading water meter | |
| CN108768517B (en) | PPM-based sending end, receiving end and visible light communication system | |
| CN103456157A (en) | Long distance passive wireless sensor remote-measuring system | |
| CN103701531B (en) | Infrared transmitting circuit, infrared receiving circuit and infrared receiving/transmitting system | |
| CN103258411A (en) | Intelligent water meter reading system based on GPRS technology | |
| CN202475773U (en) | CC2530-chip-based ZigBee radio frequency module | |
| CN104601288A (en) | XCP (Expendable Current Profiler) dynamic data transmission method | |
| CN104124781B (en) | Power supply module of induction type power supply and data interpretation method thereof | |
| CN102564530A (en) | Intelligent two-wire photoelectric level transmitter with current ranging from 4mA to 20mA | |
| CN107659310B (en) | Can realize AGV guide and frequency generator of communication | |
| CN203554495U (en) | Network-type RF wireless intelligent gas meter management gateway | |
| CN203939500U (en) | Signal transmission system for direct-reading logging instrument | |
| CN203422641U (en) | Gear box intelligent monitoring system in industrial field | |
| CN202475410U (en) | Zigbee-protocol-based downhole signal transmission module | |
| Jiang et al. | Simple underwater wireless communication system | |
| CN108801432A (en) | A kind of belt weighing data transmission method and system based on LoRa wireless communication techniques | |
| CN100338602C (en) | RS485+I multiple analog signal bus transmitter | |
| CN1129059C (en) | Man-computer interface device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071107 Termination date: 20100430 |