CN113645583B - Thermocouple or thermal resistor wireless transmission system - Google Patents
Thermocouple or thermal resistor wireless transmission system Download PDFInfo
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- CN113645583B CN113645583B CN202110903666.8A CN202110903666A CN113645583B CN 113645583 B CN113645583 B CN 113645583B CN 202110903666 A CN202110903666 A CN 202110903666A CN 113645583 B CN113645583 B CN 113645583B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
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Abstract
The thermocouple or thermal resistance wireless transmission system comprises a front end acquisition unit and a rear end receiving unit, wherein the front end acquisition unit comprises a sensor, an analog-to-digital conversion transmitter, a first microcontroller, a first LORA receiving and transmitting compatible module and a first LORA antenna which are sequentially arranged, and the rear end receiving unit comprises a second LORA antenna, a second LORA receiving and transmitting compatible module, a second microcontroller and a digital-to-analog conversion transmitter; the rear-end receiving unit can correspondingly obtain signals of the plurality of front-end acquisition units, so that the signals of the plurality of sensors can be obtained by one receiving unit; the first microcontroller and the second microcontroller further comprise a verification program. The invention realizes the wireless transmission of thermocouple or thermal resistance signals, replaces the traditional cable transmission mode, and ensures the one-to-one transmission of data and the correctness of the data by the first microcontroller and the second verification program for control.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a thermocouple or thermal resistance wireless transmission system.
Background
Sensors play a very important role in the 4.0 era of industry. Along with the application and popularization of the Internet of things in the industrial field, the sensor is more and more widely applied to the Internet of things. The sensor is the bottommost layer and the forefront of the technology of the Internet of things, and has very important significance for the development of the industry of the Internet of things. In recent years, the policy support strength of the internet of things of China is continuously increased, and compared with the early stage of twelve and five, china has remarkable effects in the aspects of key technology research and development of the internet of things, application demonstration and popularization, industry coordinated development, policy environment construction and the like, and becomes one of the regions where the global internet of things development is most active.
According to data, the annual composite growth rate of the Internet of things market reaches 25% in the period of twelve and five, and the whole scale of the Internet of things in China is expected to reach 2.2 trillion yuan in 2020, as shown in figure 1. In this context, the sensor market is also growing further. According to data, the market size of the sensor in China in 2017 is 1815 hundred million yuan, 2000 hundred million yuan is broken through in 2018, the application range of the sensor in 2019 is enlarged, and the market size is further enlarged and is expected to be about 2310 hundred million yuan.
The traditional sensor data transmission structure is characterized in that signals corresponding to temperature, air pressure and noise are finally obtained through a sensitive element, a conversion element and a conversion circuit, and in the process, the conversion element and the conversion circuit are supported through an auxiliary power supply.
However, in some remote areas, it is not easy to obtain data, so that it is very urgent to accurately transmit the data detected by the sensor.
Disclosure of Invention
In order to realize accurate transmission of data detected by a sensor, the invention provides a thermocouple or thermal resistance wireless transmission system, which comprises the following specific schemes:
the thermocouple or thermal resistance wireless transmission system comprises a front end acquisition unit and a rear end receiving unit, wherein the front end acquisition unit comprises a sensor, an analog-to-digital conversion transmitter, a first microcontroller, a first LORA receiving and transmitting compatible module and a first LORA antenna which are sequentially arranged, and the rear end receiving unit comprises a second LORA antenna, a second LORA receiving and transmitting compatible module, a second microcontroller and a digital-to-analog conversion transmitter; the rear-end receiving unit can correspondingly obtain signals of the plurality of front-end acquisition units, so that the signals of the plurality of sensors can be obtained by one receiving unit;
the first microcontroller and the second microcontroller further comprise a verification program, and the verification program is specifically as follows:
s1, adding check bits into digital signals converted by a sensor by a first microcontroller;
s2, the front end acquisition unit and the rear end receiving unit transmit data in a preset frequency area;
s3, judging whether the transmission frequency ranges of the front end acquisition unit and the rear end receiving unit are crossed, if so, determining another wireless transmission frequency range in which the transmission frequency range of the front end acquisition unit is not crossed according to the relative position of the transmission frequency range of the front end acquisition unit in a preset frequency area and the interval length occupied by the rear end receiving unit in the preset frequency area, and then entering step S4; if not, entering step S2;
s4, after the second microcontroller confirms the received signal, screening the data to confirm whether the check bit data are correct or not, and if not, entering a step S5 by sending a signal to the first microcontroller; otherwise, converting the data and transmitting the converted data to a second LPRA receiving and transmitting compatible module for processing;
s5, initializing the data by the first microcontroller to obtain new data, replacing a verification mode and re-verifying, and then entering a step S2, wherein the second microcontroller correspondingly changes the verification comparison according to the times sent to the first microcontroller.
Specifically, the relay unit comprises a third LORA antenna, a LORA gateway and a fourth LORA antenna which are sequentially arranged.
Specifically, the sensor is a 4-channel PT100 temperature acquisition sensor, and the LORA transceiver compatible module adopts an inlet chip SX1278 based on SEMTECH company.
Specifically, the first LORA transceiver compatible module includes a UART universal asynchronous receiver-transmitter and a spread spectrum transmission module connected in sequence.
Specifically, the front end acquisition unit and the rear end receiving unit are both packaged into an independent module, and the corresponding first LORA antenna and second LORA antenna are configured as an internal transmission antenna or an external transmission antenna according to different schemes.
Specifically, the second microcontroller comprises two working modes, wherein one working mode is that Modbus industrial protocol is directly and digitally written into an RS485/RS232 data bus interface of an industrial control system such as PLC/DCS/DDS and the like; the second working mode is to obtain a sensor analog acquisition interface which is converted back into a sensor original signal through a millivolt voltage/millivolt current conversion circuit from a second microcontroller clock and is connected to an industrial control system such as PLC/DCS/DDS.
The invention has the beneficial effects that:
(1) The invention realizes the wireless transmission of thermocouple or thermal resistance signals, replaces the traditional cable transmission mode, and ensures the one-to-one transmission of data and the correctness of the data by the first microcontroller and the second verification program for control.
(2) The invention realizes thermocouple/resistance signal acquisition, processing and wireless digital transmission; the thermocouple/resistance signal wireless receiving, processing and conversion analog signal output are realized.
(3) The invention realizes the modularized design of the signal transmitting end and the signal receiving end and performs independent encapsulation.
Drawings
Fig. 1 is a block diagram of a front-end acquisition unit.
Fig. 2 is a structural diagram of the relay unit.
Fig. 3 is a structural diagram of the rear-end receiving unit.
11. A sensor; 12. an analog-to-digital conversion transmitter; 13. a first microcontroller; 14. a first LORA transceiver compatible module; 141. UART universal asynchronous receiver/transmitter; 142. a spread spectrum transmission module; 15. a first LORA antenna; 21. a third LORA antenna; 22. a LORA gateway; 23. a fourth LORA antenna; 31. a second LORA antenna; 32. a second LORA transceiver compatible module; 33. a second microcontroller; 34. digital-to-analog converter.
Detailed Description
1-3, the thermocouple or thermal resistor wireless transmission system comprises a front end acquisition unit and a rear end receiving unit, wherein the front end acquisition unit comprises a sensor, an analog-to-digital conversion transmitter, a first microcontroller, a first LORA receiving and transmitting compatible module and a first LORA antenna which are sequentially arranged, and the rear end receiving unit comprises a second LORA antenna, a second LORA receiving and transmitting compatible module, a second microcontroller and a digital-to-analog conversion transmitter. The rear-end receiving unit can correspondingly obtain signals of a plurality of front-end acquisition units, so that the signals of a plurality of sensors can be obtained by one receiving unit.
Preferably, as shown in fig. 2, the wireless communication system further comprises a relay unit, and the relay unit comprises a third LORA antenna, a LORA gateway and a fourth LORA antenna which are sequentially arranged.
In this embodiment, the sensor is a 4-channel PT100 temperature acquisition sensor, and the LORA transceiver compatible module is based on SEMTECH company inlet chip SX1278 (transceiver integrated).
Specifically, the first LORA transceiver compatible module includes a UART universal asynchronous receiver-transmitter and a spread spectrum transmission module connected in sequence.
The front end acquisition unit and the rear end receiving unit are packaged into an independent module, and the corresponding first LORA antenna and second LORA antenna are configured into an internal transmission antenna or an external transmission antenna according to different schemes. The first microcontroller and the second microcontroller both use SOC chips.
The second microcontroller comprises two working modes, wherein one working mode is that Modbus industrial protocol is directly and digitally written into an RS485/RS232 data bus interface of an industrial control system such as a PLC/DCS/DDS and the like. The second working mode is to obtain a sensor analog acquisition interface which is converted back into a sensor original signal through a millivolt voltage/millivolt current conversion circuit from a second microcontroller clock and is connected to an industrial control system such as PLC/DCS/DDS.
The sensor is a temperature sensor, the temperature sensor converts the temperature required to be acquired into analog voltage/current signals such as current or voltage through a thermocouple/thermal resistor, the analog voltage/current signals are converted through an SOC chip and transmitted in a wireless mode, and then the receiving end simulates the original signals, so that the wireless access of the temperature sensor can be realized under the condition of not changing the original control system.
The thermocouple sensor generates millivolt level sensor output voltage, the resistance of the thermal resistance sensor changes along with temperature change, the sensor converts analog signals into digital signals through an embedded analog-to-digital conversion transmitter, then the digital signals and the detection point temperature are controlled and read by an SOC chip in the first microcontroller through an IIC bus protocol or an SPI bus protocol, a fixed transfer function relation is kept between the digital signals and the detection point temperature, and the SOC chip speculates the detection point temperature reversely through the transfer function relation. After the first microcontroller converts the acquired data, the acquired data is transmitted to a spread spectrum transmission module through a UART universal asynchronous receiver/transmitter in the first LORA receiving and transmitting compatible module, and the spread spectrum transmission module modulates the received information to radio waves of corresponding frequency bands and sends the radio waves out through a first LORA antenna.
The second LORA antenna in the other rear-end receiving unit within the transmission distance receives radio wave signals from the air, effective information is analyzed by the second LORA receiving and transmitting compatible module, the effective information is sent to the SOC chip in the second microcontroller through the UART bus, the SOC chip in the second microcontroller receives the information and then carries out further analysis and conversion, then a digital-to-analog conversion transmitter outputs 0-3.3V voltage signals, and the signals which are the same as the sensors can be output to the existing automatic control system after the conversion of a thermocouple or a thermal resistance analog circuit, so that the non-inductive switching is realized without modifying the program of the existing control system. The wireless transmission may also employ a 4G communication network.
The first microcontroller and the second microcontroller further comprise a verification program, and the verification program is specifically as follows:
s1, adding check bits into digital signals converted by a sensor by a first microcontroller;
s2, the front-end acquisition unit, the relay unit and the rear-end receiving unit transmit data in a preset frequency area;
s3, judging whether the transmission frequency ranges of the front end acquisition unit and the rear end receiving unit are crossed, if so, determining another wireless transmission frequency range in which the transmission frequency range of the front end acquisition unit is not crossed according to the relative position of the transmission frequency range of the front end acquisition unit in a preset frequency area and the interval length occupied by the rear end receiving unit in the preset frequency area, and then entering step S4; if not, entering step S2;
s4, after the second microcontroller confirms the received signal, screening the data to confirm whether the check bit data are correct or not, and if not, entering a step S5 by sending a signal to the first microcontroller; otherwise, converting the data and transmitting the converted data to a second LPRA receiving and transmitting compatible module for processing;
s5, initializing the data by the first microcontroller to obtain new data, replacing a verification mode and re-verifying, and then entering a step S2, wherein the second microcontroller correspondingly changes the verification comparison according to the times sent to the first microcontroller.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The thermocouple or thermal resistance wireless transmission system is characterized by comprising a front end acquisition unit and a rear end receiving unit, wherein the front end acquisition unit comprises a sensor, an analog-to-digital conversion transmitter, a first microcontroller, a first LORA receiving-transmitting compatible module and a first LORA antenna which are sequentially arranged, and the rear end receiving unit comprises a second LORA antenna, a second LORA receiving-transmitting compatible module, a second microcontroller and a digital-to-analog conversion transmitter; the rear-end receiving unit can correspondingly obtain signals of the plurality of front-end acquisition units, so that the signals of the plurality of sensors can be obtained by one receiving unit;
the first microcontroller and the second microcontroller further comprise a verification program, and the verification program is specifically as follows:
s1, adding check bits into digital signals converted by a sensor by a first microcontroller;
s2, the front end acquisition unit and the rear end receiving unit transmit data in a preset frequency area;
s3, judging whether the transmission frequency ranges of the front end acquisition unit and the rear end receiving unit are crossed, if so, determining another wireless transmission frequency range in which the transmission frequency range of the front end acquisition unit is not crossed according to the relative position of the transmission frequency range of the front end acquisition unit in a preset frequency area and the interval length occupied by the rear end receiving unit in the preset frequency area, and then entering step S4; if not, entering step S2;
s4, after the second microcontroller confirms the received signal, screening the data to confirm whether the check bit data are correct or not, and if not, entering a step S5 by sending a signal to the first microcontroller; otherwise, converting the data and transmitting the converted data to a second LPRA receiving and transmitting compatible module for processing;
s5, initializing the data by the first microcontroller to obtain new data, replacing a verification mode and re-verifying, and then entering a step S2, wherein the second microcontroller correspondingly changes the verification comparison according to the times sent to the first microcontroller.
2. The thermocouple or thermal resistor wireless transmission system of claim 1, further comprising a relay unit comprising a third LORA antenna, a LORA gateway, and a fourth LORA antenna, disposed in sequence.
3. The thermocouple or thermal resistor wireless transmission system according to claim 1, wherein the sensor is a 4-channel PT100 temperature acquisition sensor, and the LORA transceiver compatible module is based on SEMTECH company inlet chip SX1278.
4. The thermocouple or thermal resistor wireless transmission system of claim 1, wherein the first LORA transceiver compatible module comprises a UART universal asynchronous receiver transmitter and a spread spectrum transmission module connected in sequence.
5. The thermocouple or thermal resistor wireless transmission system according to claim 1, wherein the front-end acquisition unit and the rear-end receiving unit are packaged as an independent module, and the corresponding first and second LORA antennas are configured as internal or external transmission antennas according to different schemes.
6. A thermocouple or thermal resistor wireless transmission system according to any of claims 1-3, wherein the second microcontroller comprises two modes of operation, one mode of operation being a Modbus industrial protocol direct digital write to an RS485/RS232 data bus interface of a PLC/DCS/DDS industrial control system; the second working mode is to obtain the sensor analog acquisition interface which is switched back to the original signal of the sensor through a millivolt voltage/millivolt current conversion circuit from the second microcontroller clock and is connected to the PLC/DCS/DDS industrial control system.
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| CN202110903666.8A CN113645583B (en) | 2021-08-06 | 2021-08-06 | Thermocouple or thermal resistor wireless transmission system |
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| CN202110903666.8A CN113645583B (en) | 2021-08-06 | 2021-08-06 | Thermocouple or thermal resistor wireless transmission system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110875788A (en) * | 2020-01-17 | 2020-03-10 | 深圳市乙辰科技股份有限公司 | Wireless transmission method and system |
| CN111121995A (en) * | 2019-12-30 | 2020-05-08 | 上海自动化仪表有限公司 | Multichannel temperature transmitter based on wireless communication technology |
| CN211481483U (en) * | 2020-03-28 | 2020-09-11 | 湖南湘钢工程技术有限公司 | Industrial analog quantity transmission module based on lora wireless network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101841388B (en) * | 2009-03-18 | 2012-07-04 | 中国科学院沈阳计算技术研究所有限公司 | Information security transmission method for numerical control bus |
| CN106357296A (en) * | 2016-10-18 | 2017-01-25 | 杭州隽德科技有限公司 | UART interface internet-of-things wireless transceiver based on lora modulation mode |
| CN110098846A (en) * | 2018-01-26 | 2019-08-06 | 广东中科陆普物联网络科技有限公司 | Wireless transceiver |
| CN208673101U (en) * | 2018-09-21 | 2019-03-29 | 江苏金恒信息科技股份有限公司 | Electrical signal collection conversion and transmitting device based on microcontroller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111121995A (en) * | 2019-12-30 | 2020-05-08 | 上海自动化仪表有限公司 | Multichannel temperature transmitter based on wireless communication technology |
| CN110875788A (en) * | 2020-01-17 | 2020-03-10 | 深圳市乙辰科技股份有限公司 | Wireless transmission method and system |
| CN211481483U (en) * | 2020-03-28 | 2020-09-11 | 湖南湘钢工程技术有限公司 | Industrial analog quantity transmission module based on lora wireless network |
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