CN111295026A - Street lamp control system based on LoRa wireless communication agreement - Google Patents
Street lamp control system based on LoRa wireless communication agreement Download PDFInfo
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- CN111295026A CN111295026A CN202010179007.XA CN202010179007A CN111295026A CN 111295026 A CN111295026 A CN 111295026A CN 202010179007 A CN202010179007 A CN 202010179007A CN 111295026 A CN111295026 A CN 111295026A
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a street lamp control system based on a LoRa wireless communication protocol, which comprises a LoRa communication module, a moving object detector, an alternating current controller, a central processing unit, a luminosity detection module and a street lamp, wherein the central processing unit, the moving object detector, the alternating current controller and the luminosity detection module are connected through the LoRa communication module, and the alternating current controller is connected with the street lamp, wherein the moving object detector comprises a radar module/an amplification circuit module, a voltage comparator, a display module and a frequency phase detection module. Has the advantages that: by setting LoRa wireless communication protocol communication, the control system has high flexibility, wireless transmission is realized, and the data transmission efficiency is higher; the method has strong creativity; the inventor adopts the amplifying circuit module to carry out high-gain amplification on the millivolt-level signal output by the radar module, and measurement errors caused by different terrain positions and heights of all detectors due to the fact that fixed parameters are set are avoided.
Description
Technical Field
The invention relates to the field of street lamp control, in particular to a street lamp control system based on a LoRa wireless communication protocol.
Background
Currently, street lamps are widely used in various places requiring illumination. With the development of cities, part of the marine oil landscape lighting in urban public lighting is an additional part of power consumption although the cities can be more beautiful. At present, the urban lighting system adopts a traditional light-operated or time-controlled control mode, operates overnight and illuminates with constant illumination intensity, is not only disconnected from actual road condition information, but also wastes electric energy, and brings inconvenience to management and maintenance.
Most of the existing street lamp control systems are in serial port communication, and the wiring and system flexibility is poor. Long range (LoRa) is a modulation technique that provides longer communication distances than the same type of technique. Based on LoRa, can realize LoRa modulation, LoRaWAN is the MAC protocol, is used for the long-range low-power consumption star network of large capacity.
Based on the characteristics of LoRa, related prior art applies the LoRa to intelligent control of the street lamp, such as "a street lamp monitoring system based on LoRa technology" of CN201821254828, and "a street lamp control system integrating environment monitoring function" of CN 201810501373; however, the above solutions all directly adopt the existing Lora communication protocol and the general Lora communication module, and do not combine the requirements of the street lamp control system with the advantages of Lora communication for customized application, and actually, the solutions are still simple improvements, and the effects are not good, even inferior to the existing other wireless communication technologies (such as Zigbee/NB-IoT).
Therefore, the prior art has a great improvement space, and a technical scheme related to customized application of the self requirement of the street lamp control system combined with the advantage of Lora communication is not available.
Disclosure of Invention
The technical task of the invention is to provide a street lamp control system based on the LoRa wireless communication protocol to solve the problem of poor system flexibility; this technical scheme has realized customizing the application with the demand of street lamp control system itself and the advantage of Lora communication to being used for street lamp control with Lora technology customization for the first time, obviously being different from the mode of the simple change wireless communication protocol module of prior art.
The technical scheme of the invention is realized as follows:
a street lamp control system based on a LoRa wireless communication protocol comprises a LoRa communication module, a moving object detector, an alternating current controller, a central processing unit, a luminosity detection module and a street lamp, wherein the central processing unit is connected with the moving object detector, the alternating current controller and the luminosity detection module through the LoRa communication module, and the alternating current controller is connected with the street lamp.
As a first innovation point of the invention, the LoRa communication module (1) is provided with a photometric feedback customization sensor (11); the luminosity feedback customization sensor (11) receives the illuminance E detected by the luminosity detection module (5), and controls the enabling state of the LoRa communication module based on the illuminance signal E.
As a second innovative aspect of the present invention, the controlling the enabling state of the LoRa communication module based on the illuminance signal E specifically includes: converting the illuminance signal E received by the luminosity feedback customized sensor (11) into a current intensity signal I according to a preset formula; if the current intensity signal I is larger than 32mA, controlling the LoRa communication module to enter a sleep state after a preset time period; the predetermined formula is as follows:
I = (E*X – 2SF)/BW;
wherein X is an area of an area where the illuminance is detected by the illuminance detection module; SF is a diffusion coefficient of the LoRa wireless communication mode, and BW is a bandwidth of the LoRa wireless communication mode.
As mentioned above, the method is different from the prior art of simple application or simple modular transplantation of the Lora technology, the wireless communication characteristic of the Lora technology is fully researched, and the state of the Lora communication module is creatively controlled by using the illuminance E detected by the illuminance detection module (5) in combination with the illuminance detection feedback of the existing street lamp system. Therefore, the LoRa communication module can not only ensure continuous work, but also enter a dormant state according to the actual situation, thereby better saving energy;
for example, the illuminance signal E received by the photometric feedback customized sensor (11) is converted into a current intensity signal I according to a predetermined formula; and if the current intensity signal I is greater than 32mA, controlling the LoRa communication module to enter a sleep state after a preset time period.
This is 32mA because one of the significant features of Lora is that the peak current is not higher than 32 mA. The method is a distinguishing point obtained by comparison with other wireless communication protocols;
however, the street lamp control system does not obtain the current signal, so the illuminance signal E needs to be converted into the current signal in a reasonable manner, so as to be provided to the control system to control the state of the LoRa communication module.
The present inventors have made extensive studies and have proposed the above formula.
Further, the terminal device of the LoRa communication module joins the network by the corresponding MAC command, the terminal device first sends a JoinRequest command to the server, if the server allows the terminal device to Join the network, the JoinAccept command is sent to respond to the terminal device, if the terminal device successfully receives the Join Accept command, the joining of the network is successful, after the LoRa communication module joins the network successfully, the terminal device performs link check to confirm whether the joining of the network is successful, the process is completed by the corresponding MAC command, the network connection is successful, then data transmission can be started, otherwise, the uplink is sent again, and the above process is repeated.
Further, the LoRa communication module may modify a channel frequency according to a communication requirement through a specific MAC command, adaptively control a data transmission rate, set a duty cycle, and set a receiving window parameter during a data transmission process.
Further, the one end of loRa communication module is connected with the one end of loRa gateway, the other end of loRa gateway is connected with the one end of cloud ware, the other end of cloud ware with central processing unit connects.
Further, the central processing unit comprises a data receiving module, a data analyzing module, a data processing module and a signal sending module, and the data receiving module, the data analyzing module, the data processing module and the signal sending module are connected in sequence.
Furthermore, the moving object detector detects the movement of vehicles or pedestrians by adopting an X-waveband Doppler mobile detection module, and comprises a radar module, an amplifying circuit module, a voltage comparator, a display module and a frequency phase detection module, wherein the radar module, the amplifying circuit module, the voltage comparator, the display module and the frequency phase detection module are sequentially connected.
Further, the moving object detector generates a frequency change between the transmitted and received signals; the module generates two low-pulse signals, and after the signals are processed by the amplifying circuit module, the frequency phase detection module can provide an audio or video alarm signal; the direction of the target object is detected by the lead/lag of the two output signals.
Further, the two paths of analog signals output by the radar module pass through the amplifying circuit module, and when the volume of the detected object is larger than a certain value and the number of times of counting triggered in unit time is larger than a preset value, the fact that the vehicle enters the detection area can be judged.
Furthermore, the amplifying circuit module in the moving object detector adopts a programmable amplifying circuit, so that the amplifying processing of the output signal of the radar module is realized, and the counting system can be effectively triggered only when the volume of the detected object is larger than a certain value.
Further, in the processing of the central processing unit, when the moving object detector detects that a vehicle enters a controlled area, the corresponding alternating current controller is controlled to sequentially light the street lamps on different lamp posts; and when the moving object detector detects that the vehicle drives away from the controlled area, controlling the corresponding alternating current controller to sequentially extinguish the street lamp on the corresponding lamp post.
The invention has the beneficial effects that:
1. when the invention detects that vehicles enter the controlled area in the incoming direction, the street lamps are controlled to be lightened; when the vehicle passes through, the street lamp is controlled to be turned off, and the dynamic control mode is favorable for energy conservation;
2. by setting LoRa wireless communication protocol communication, the control system has high flexibility, wireless transmission is realized, and the data transmission efficiency is higher; the method has strong creativity; this technical scheme has realized customizing the application with the advantage that the demand of street lamp control system itself combines the Lora communication to being used for street lamp control with the Lora technology customization for the first time, obviously being different from the mode of the simple change wireless communication protocol module of prior art
3. In order to realize better inclusion, accuracy and sensitivity of moving objects, the amplification circuit module is adopted to carry out high-gain amplification on millivolt signals output by the radar module, so that the measurement error of each detector caused by different terrain positions and heights of the detectors due to the setting of fixed parameters is avoided, and the detection device can be adapted to different positions to ensure that the measurement is more accurate;
4. in order to avoid the situation that a street lamp is lightened due to radar misjudgment caused by weather factors (such as leaves fluttering caused by wind) or small animals running, programmable reference voltage is selectively introduced, and the street lamp is prevented from being lightened when small-body moving objects pass;
5. in order to distinguish people, vehicles and small animals, when the final waveform is output, the pulse frequency output by the comparator is measured, low-frequency disturbance is filtered out, the result is more accurate, the vehicle speed is calculated through the phase difference and the frequency, and the starting time of the lamp is controlled through the vehicle speed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a block diagram of a street lamp control system based on an LoRa wireless communication protocol according to an embodiment of the present invention;
FIG. 2 is a block diagram of a moving object detector according to an embodiment of the present invention;
fig. 3 is a block diagram of a LoRa communication module according to an embodiment of the present invention;
fig. 4 is a block diagram of a central processing unit according to an embodiment of the present invention.
In the figure:
1. a LoRa communication module; 11: a photometric feedback customization sensor; 2. a moving object detector; 3. an AC controller; 4. a central processing unit; 5. a luminosity detection module; 6. a street lamp; 7. a radar module; 8. an amplifying circuit module; 9. a voltage comparator; 10. a display module; 11. a frequency phase detection module; 12. an LoRa gateway; 13. a cloud server; 14. a data receiving module; 15. a data analysis module; 16. a data processing module; 17. and a signal sending module.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
In a first embodiment, as shown in fig. 1, a street lamp control system based on a LoRa wireless communication protocol according to an embodiment of the present invention includes a LoRa communication module 1, a moving object detector 2, an ac controller 3, a central processing unit 4, a luminosity detection module 5, and a street lamp 6, where the central processing unit 4 is connected with the moving object detector 2, the ac controller 3, and the luminosity detection module 5 through the LoRa communication module 1, and the ac controller 3 is connected with the street lamp 6.
The LoRa communication module (1) is provided with a luminosity feedback customization sensor (11); the luminosity feedback customization sensor (11) receives the illuminance E detected by the luminosity detection module (5), and controls the enabling state of the LoRa communication module based on the illuminance signal E.
Specifically, a light intensity signal E received by the luminosity feedback customized sensor (11) is converted into a current intensity signal I according to a preset formula; if the current intensity signal I is greater than 32mA, controlling the LoRa communication module to enter a sleep state after a preset time period (for example, 10 s); the predetermined formula is as follows:
I = (E*X – 2SF)/BW;
wherein X is an area of an area where the illuminance is detected by the illuminance detection module; SF is a diffusion coefficient of the LoRa wireless communication mode, and BW is a bandwidth of the LoRa wireless communication mode.
It should be noted that in fig. 1, there are at least two LoRa communication modules; the LoRa communication module connected with the moving object detector and the central processing unit does not receive the illuminance E detected by the illuminance detection module (5), and only the LoRa communication module connected with the alternating current controller of the street lamp receives the illuminance E detected by the illuminance detection module (5), so that the state of the street lamp based on the detection of the moving object is not influenced by an illuminance signal.
Second embodiment, as shown in fig. 1 to 3, the terminal device of the LoRa communication module 1 completes network joining by a corresponding MAC command, the terminal device first sends a JoinRequest command to the server, if the server allows the terminal device to Join the network, the server sends a Join Accept command to respond to the terminal device, if the terminal device successfully receives the Join Accept command, the network joining is successful, after the LoRa communication module 1 succeeds in network joining, the terminal device performs link check to determine whether the terminal device successfully joins the network, the process is completed by the corresponding MAC command, the network connection is successful, then data transmission can be started, otherwise, the uplink is retransmitted, the above process is repeated, the LoRa communication module 1 can modify the channel frequency by a specific MAC command according to the communication requirement during data transmission, and adaptively control the data transmission rate, The working period is set and the receiving window parameters are set, one end of the loRa communication module 1 is connected with one end of the loRa gateway 12, the other end of the loRa gateway 12 is connected with one end of the cloud server 13, and the other end of the cloud server 13 is connected with the central processing unit 4.
In a third embodiment, as shown in fig. 4, the central processing unit 4 includes a data receiving module 14, a data analyzing module 15, a data processing module 16 and a signal sending module 17, and the data receiving module 14, the data analyzing module 15, the data processing module 16 and the signal sending module 17 are connected in sequence.
In a fourth embodiment, as shown in fig. 2, the moving object detector 2 detects the movement of a vehicle or a pedestrian by using an X-band doppler shift detection module, the moving object detector 2 includes a radar module 7, an amplification circuit module 8, a voltage comparator 9, a display module 10, and a frequency phase detection module 11, the radar module 7, the amplification circuit module 8, the voltage comparator 9, the display module 10, and the frequency phase detection module 11 are sequentially connected, and the moving object detector 2 generates a frequency change between transmitted and received signals; the radar module 7 generates two low-pulse signals, and after the signals are processed by the amplifying circuit module 8, the frequency phase detection module 11 can provide an audio or video alarm signal; the direction of a target object is detected through the lead/lag of two output signals, two paths of analog signals output by the radar module 7 pass through the amplifying circuit module 8, when the volume of the detected object is larger than a certain value and the number of counting times triggered in unit time is larger than a preset value, a vehicle can be judged to enter a detection area, the amplifying circuit module 8 in the moving object detector 2 adopts a programmable amplifying circuit, the amplification processing of the output signals of the radar module 7 is realized, and only when the volume of the detected object is larger than a certain value, the counting system can be effectively triggered.
In the fifth embodiment, as shown in fig. 1, in the processing of the central processing unit 4, when the moving object detector 2 detects that a vehicle enters the controlled area, the corresponding ac controllers 3 are controlled to sequentially light up the street lamps 6 on different lamp posts; and when the moving object detector 2 detects that the vehicle drives away from the controlled area, controlling the corresponding alternating current controller 3 to sequentially extinguish the street lamps 6 on the corresponding lamp posts.
For the convenience of understanding the technical solutions of the present invention, the following detailed descriptions will be provided for the working principles or the operation modes of the present invention in the practical process
In practical application: when the signals collected by the LoRa communication module 1 are sent to the data receiving module 14 in the central processing unit 4, the signals are analyzed and processed by the data analysis module 15 and the data processing module 16, the processed results are fed back to the cloud server 13 by the signal sending module 17, a plurality of groups of LoRa communication modules 1 are controlled by the LoRa gateway 12, when the moving object detector 2 detects the movement of a vehicle or a pedestrian by adopting an X-waveband (10.525 GHz) Doppler mobile detection module, under the same detection distance, because the amplitude of the output signal of the radar module 7 and the size of the object to be detected form positive correlation characteristics, the circuit adopts the programmable amplification circuit module 8 to realize the amplification processing of the output signal of the radar module 7, only when the volume of the object to be detected is larger than a certain value, the counting system can be effectively triggered, and counting can not be triggered when the objects such as cats, dogs, mice and the like of small size pass through, therefore, the false triggering caused by the passing of the animals can be avoided. When the moving object detector 2 detects that a vehicle enters a controlled area, controlling the corresponding alternating current controller 3 to sequentially light up the street lamps 6 on different lamp posts; when the moving object detector 2 detects that the vehicle drives away from the controlled area, the corresponding alternating current controller 3 is controlled to sequentially extinguish the street lamps 6 on the corresponding lamp posts, so that the control effects of on-coming light and off-going light of the vehicle are achieved.
In terms of customization, the luminosity feedback customization sensor (11) receives the illuminance E detected by the luminosity detection module (5), and controls the enabling state of the LoRa communication module based on the illuminance signal E, specifically including: converting the illuminance signal E received by the luminosity feedback customized sensor (11) into a current intensity signal I according to a preset formula; if the current intensity signal I is larger than 32mA, controlling the LoRa communication module to enter a dormant state after 10-15 s; the predetermined formula is as follows:
I = (E*X – 2SF)/BW;
wherein X is an area of an area where the illuminance is detected by the illuminance detection module; SF is a diffusion coefficient of the LoRa wireless communication mode, and BW is a bandwidth of the LoRa wireless communication mode.
The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the disclosed embodiments, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.
Claims (10)
1. A street lamp control system based on a LoRa wireless communication protocol comprises a LoRa communication module (1), a moving object detector (2), an alternating current controller (3), a central processing unit (4), a luminosity detection module (5) and a street lamp (6), wherein the central processing unit (4), the moving object detector (2), the alternating current controller (3) and the luminosity detection module (5) are connected through the LoRa communication module (1), and the alternating current controller (3) is connected with the street lamp (6);
the method is characterized in that: the LoRa communication module (1) is provided with a luminosity feedback customization sensor (11); the luminosity feedback customization sensor (11) receives the illuminance E detected by the luminosity detection module (5), and controls the enabling state of the LoRa communication module based on the illuminance signal E, and the luminosity feedback customization sensor specifically comprises: converting the illuminance signal E received by the luminosity feedback customized sensor (11) into a current intensity signal I according to a preset formula; if the current intensity signal I is larger than 32mA, controlling the LoRa communication module to enter a sleep state after a preset time period; the predetermined formula is as follows:
I = (E*X – 2SF)/BW;
wherein X is an area of an area where the illuminance is detected by the illuminance detection module; SF is a diffusion coefficient of the LoRa wireless communication mode, and BW is a bandwidth of the LoRa wireless communication mode.
2. The LoRa wireless communication protocol-based street lamp control system according to claim 1, wherein the terminal device of the LoRa communication module (1) joins the network via a corresponding MAC command, the terminal device first sends a Join request command to the server, if the server allows the terminal device to Join the network, the server sends a Join Accept command to respond to the terminal device, if the terminal device successfully receives the Join Accept command, the joining of the network is successful, after the LoRa communication module (1) joins the network successfully, the terminal device performs link check to determine whether the joining of the network is successful, the process is completed via the corresponding MAC command, the network connection is successful, and then data transmission is performed, otherwise, the terminal device retransmits the uplink, and the process is repeated.
3. The LoRa wireless communication protocol-based street lamp control system according to claim 2, wherein the LoRa communication module (1) modifies a channel frequency by a specific MAC command according to a communication requirement during data transmission, adaptively controls a data transmission rate, sets a duty cycle, and sets a receiving window parameter.
4. The street lamp control system based on the LoRa wireless communication protocol according to claim 3, wherein one end of the LoRa communication module (1) is connected with one end of a LoRa gateway (12), the other end of the LoRa gateway (12) is connected with one end of a cloud server (13), and the other end of the cloud server (13) is connected with the central processing unit (4).
5. The LoRa wireless communication protocol-based street lamp control system according to claim 1, wherein the central processor (4) comprises a data receiving module (14), a data analyzing module (15), a data processing module (16) and a signal transmitting module (17), and the data receiving module (14), the data analyzing module (15), the data processing module (16) and the signal transmitting module (17) are sequentially connected with each other.
6. The street lamp control system based on the LoRa wireless communication protocol according to claim 1, wherein the moving object detector (2) detects the movement of a vehicle or a pedestrian by using an X-band doppler shift detection module, the moving object detector (2) comprises a radar module (7), an amplification circuit module (8), a voltage comparator (9), a display module (10) and a frequency phase detection module (11), and the radar module (7), the amplification circuit module (8), the voltage comparator (9), the display module (10) and the frequency phase detection module (11) are sequentially connected with one another.
7. Street lamp control system based on the LoRa wireless communication protocol according to claim 6, wherein the moving object detector (2) generates a frequency change between the transmitted and received signals; the radar module (7) generates two low-pulse signals, and after the signals are processed by the amplifying circuit module (8), the frequency phase detection module (11) can provide an audio or video alarm signal; the direction of the target object is detected by the lead/lag of the two output signals.
8. The LoRa wireless communication protocol-based street lamp control system according to claim 7, wherein the two analog signals output by the radar module (7) are amplified by the amplifier circuit module (8), and when the volume of the detected object is greater than a certain value and the number of triggered counts per unit time is greater than a preset value, it can be determined that a vehicle enters the detection area.
9. The LoRa wireless communication protocol-based street lamp control system according to claim 8, wherein the amplification circuit module (8) of the moving object detector (2) employs a programmable amplification circuit, so as to achieve amplification of the output signal of the radar module (7), and the counting system can be effectively triggered only when the volume of the detected object is greater than a certain value.
10. The LoRa wireless communication protocol-based street lamp control system according to claim 1, wherein the central processor (4) controls the ac controller (3) to sequentially turn on the street lamps (6) on different lamp poles when the moving object detector (2) detects that a vehicle enters a controlled area; and when the moving object detector (2) detects that the vehicle leaves the controlled area, the corresponding alternating current controller (3) is controlled to sequentially extinguish the street lamps (6) on the corresponding lamp posts.
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| US20190174608A1 (en) * | 2007-06-29 | 2019-06-06 | Orion Energy Systems, Inc | Outdoor lighting fixtures control systems and methods |
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