CN104464622A - Wireless distribution type LED traffic guiding display system - Google Patents
Wireless distribution type LED traffic guiding display system Download PDFInfo
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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
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Abstract
The invention discloses a wireless distribution type LED traffic guiding display system. The system comprises a coordinator (103), a plurality of route display nodes (101), a plurality of terminal display nodes (102), a control module (104) and a communication module (105), wherein and two-way wireless communication is performed between the coordinator (103) and the route display nodes (101) and between the route display nodes (101) and the terminal display nodes (102); one serial port of the control module (104) is connected with the coordinator (103), and the other serial port of the control module (104) is connected with the communication module (105). According to the system, a display screen is divided into a plurality of independent subareas, and system reliability is improved because distribution type control over the subareas is performed through a ZigBee wireless network; data throughout is shared by a plurality of CPUs, the requirement for the single CPU is remarkably lowered, and system stability is improved; all the nodes are the same in hardware structure, the universality and the interchangeability of a circuit board are improved, and meanwhile, the manufacturing cost of the printed circuit board is reduced.
Description
Technical field
The present invention relates to LED display technology, particularly a kind of wireless distributed LED traffic guidance display screen system.
Background technology
LED traffic guidance screen is widely used on urban road and highway, and along with human cost increases, induced screen maintenance cost also improves year by year, and the traffic guidance screen of research and development high reliability, high stability, low maintenance rate has become the certainty in market.
Chinese patent instructions " the wireless LED display screen control system based on ZigBee " (Authorization Notice No.: CN 102289359 B), " a kind of wireless LED display screen system based on TD-SCDMA network " (Authorization Notice No.: CN 203746360 U) discloses and wireless communication technology is used for LED display, the former uses ZigBee technology, and the latter uses 3G technology.Their weak point is: only adopt wireless communication technology to replace the wireless data communications of wired serial communication realization to monoblock LED display, but still adopt wired centerized fusion method in LED display inside, the reliability and stability of LED display work can not be improved.
Chinese patent instructions " distributed wireless LED display system " (Authorization Notice No.: CN 101206820 B) discloses a kind of single pixel distribution formula display, the LED display system of centralized wireless data communications, its weak point is: each pixel needs independently controller and interlock circuit, when pixel is more, hardware cost is very high; Pel spacing is very large, is not suitable for the LED display screen system that pel spacing is compact; Adopt centralized wireless data communications, directly cause display refresher rate slow, be only suitable for showing the figure and Word message that prestore.
Summary of the invention
The object of the invention is to solve said system Problems existing, providing a kind of distribution type LED traffic guidance screen system adopting ZigBee wireless network control.
The present invention is achieved in that wireless distributed LED traffic guidance screen system comprises a telegon, the display of multiple route node, multiple terminal demonstration node, a control module and a communication module.Telegon and multiple route show between node, all carry out two-way wireless communication between multiple route display nodes and multiple terminal demonstration node; A serial ports of control module is connected with telegon, and another serial ports of control module is connected with communication module.
Telegon, set up Zigbee wireless network, managing network node, internodal routing iinformation is provided, storage networking node data transmits information, node is shown and terminal demonstration node carries out data communication with route, obtain each sub regions display certificate and order with control module two-way communication, and feed back each sub regions status information to control module.
Route display node, with telegon and terminal demonstration node communication, stores the data in Zigbee network, merges and forwarding.Control 16x16 LED dot matrix Display panel, reads the data of humiture collection unit.
Terminal demonstration node, shows node communication with route, obtains display data and order, and subregion status information belonging to feedback, control 16x16 LED dot matrix Display panel, reads the data of humiture collection unit.
Control module, explains and process LED traffic guidance shields the communication protocol with remote control center; In character library flash memory, read the dot array data of word to be shown according to displaying contents, and pack respectively according to each 16 × 16 LED dot matrix subregion that induced screen divides; Dot array data bag corresponding for all subregion is sent to telegon through serial ports; The status information of feedback LED traffic guidance screen is to remote control center.
Communication module, by optical cable, 3G, GPRS or RS485 mode and remote control center two-way communication, obtains display data and order on the one hand, and feedback induced screen state is to remote control center on the other hand.Communication module also realizes two-way communication by serial ports and control module, forwards the display data of remote control center on the one hand and orders to control module, obtains the induced screen status information that control module transmits on the other hand.
Route display node and terminal demonstration node are by high frequency core board and low frequency base plate composition.High frequency core board comprises a slice CC2530 on-chip system chip.Low frequency base plate comprises: LED drive unit, 16x16 LED dot matrix panel, serial communication unit and humiture collection unit.High frequency core board is connected with double socket by double contact pin with low frequency base plate; CC2530 on-chip system chip is connected to LED drive unit, humiture collection unit and serial communication unit through double contact pin and double socket; LED drive unit connects again 16x16 LED dot matrix panel.
CC2530 on-chip system chip, realizes Zigbee network interior joint and telegon, and the radio communication between node, control 16x16 LED dot matrix Display panel, reads humiture collection cell data.
LED drive unit, for 16x16 LED dot matrix Display panel provides drive current.
16x16 LED dot matrix panel, each pixel is made up of red, green, yellow three look multiple LED, forms 16x16 dot matrix, for showing information and traffic bitmap.
Serial communication unit, shows debugging and the maintenance of node and terminal demonstration node for route.
Humiture collection unit, includes temperature and moisture sensors, can obtain the temperature and humidity information of subregion belonging to display node.
Control module comprises: ARM STM32 microprocessor, ambient light sensing unit and character library flash memory.Ambient light sensing unit and character library flash memory are all connected to the I/O(I/O of ARM STM32 microprocessor) on pin.
ARM STM32 microprocessor, realizes the data communication with communication module, telegon, reads the outer monochrome information of screen and the operation character library flash memory of the collection of surround lighting sensing unit.
Ambient light sensing unit, comprises and is arranged on LED traffic guidance screen top, three of the front and back silicon photocell sensors gathering surround lightings.
Character library flash memory, for storing GB Chinese character, the dot array data of western language and traffic bitmap lattice information.
According to system of the present invention, monoblock display screen is divided into multiple subregion, and each sub regions is control 16x16 LED dot matrix Display panel independently, achieves the distributed AC servo system of LED traffic guidance screen; The wireless data communications in telegon and screen between all subregion is achieved by ZigBee-network.
The invention has the advantages that: 1. fault incidence can be limited to subregion inside, prevent fault pervasion, add system reliability, decrease maintenance frequency.2. adopt Zigbee wireless network to realize data communication, telecommunication cable and bus transceiver need not be used, avoid the full frame or large-area displays inefficacy because telecommunication cable or bus transceiver fault cause, and can also be cost-saving adding system reliability while.3. data throughout can be shared on multiple CPU, make whole system become multi-core parallel concurrent processor, the performance requirement of single processor is significantly reduced, thus add the stability of system.4. all routing nodes and display node all adopt identical hardware design, all containing compared with the high frequency core board of small size and the low frequency base plate of larger area, improve the versatility of circuit board, interchangeability, reduce printed circuit board (PCB) making sheet cost simultaneously.5. communication module has polytype, traffic guidance is shielded and externally has unified communication interface, improve the versatility of whole induced screen system.
Accompanying drawing explanation
Fig. 1 is present system structured flowchart.
Fig. 2 is control module block diagram of the present invention.
Fig. 3 is that the present invention shows node hardware block diagram.
Fig. 4 is control module workflow diagram of the present invention.
Fig. 5 is that the present invention shows node workflow diagram.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Embodiment:
In the present embodiment, wireless distributed LED traffic guidance screen dot matrix is 256x48, monoblock display screen is divided into 48 sub regions, every sub regions comprises 16x16 dot matrix, control by the CC2530 on-chip system chip 3011 on high frequency core board 301 in subregion is independent, become a display node in Zigbee network, display node comprises route display node 101 and terminal demonstration node 102,48 sub regions define 48 display nodes, and these display nodes form Zigbee wireless short-range network together with telegon 103.
Fig. 1 is system architecture diagram, and be the wireless distributed traffic guidance screen system realized according to the present invention, this system shows node 101 by route, and terminal demonstration node 102, telegon 103, control module 104 and communication module 105 are formed., monoblock display screen comprises 1 telegon and 48 display nodes, the 16x16 dot matrix that each display node disjoint controls in its subregion shows, telegon 103 and route show node 101, route display node 101 is all realize radio communication by Zigbee network with terminal demonstration node 102, thus achieve the wireless distributed control of monoblock LED traffic guidance screen, its usefulness is: 1) when one or several display nodes break down, only affect the display of one or several 16x16 dot matrix region, and the display in other region is unaffected, therefore effectively prevent fault pervasion, full frame or large-area displays inefficacy can not be caused, thus add the reliability of LED traffic guidance screen, decrease maintenance frequency simultaneously.2) adopt Zigbee wireless network not need extra telecommunication cable and bus transceiver, avoid the full frame or large-area displays that telecommunication cable or bus transceiver fault cause and lost efficacy, and can also be cost-saving.3) every sub regions all realizes display to 16x16 dot matrix and control by CC2530 on-chip system chip 3011, full frame data throughout just can be shared on multiple CPU of all subregion by this, whole distributed system is made to become a multi-core parallel concurrent processor, thus single cpu performance requirement is significantly reduced, make system stability obtain enhancing.
Fig. 2 is control module block diagram, and control module 104 comprises: ARM STM32 microprocessor 202, ambient light sensing unit 201 and character library flash memory 203.Ambient light sensing unit 201 comprises the silicon photocell sensor that three gather surround lighting, is arranged on LED traffic guidance screen top, front and back respectively.ARM STM32 microprocessor 202 mainly completes: LED traffic guidance screen is explained with the communication protocol of remote control center and processes, from character library flash memory 203, read the dot array data needed for the display of each sub regions and pack, dot array data bag corresponding for all subregion is sent to telegon 103 by serial ports.Character library flash memory 203 is for storing GB Chinese character, the dot array data of western language and traffic bitmap dot array data.
Fig. 4 is control module workflow diagram, and this process flow diagram starts from step S401.
In step S402, control module 104 judges whether to receive data and the order of issuing LED traffic guidance screen from remote control center 106 from communication module 105, if received, proceeds to step S403, otherwise proceeds to step S406.
In step S403, judge whether the data received are data to be displayed, if display data then proceed to S404, otherwise proceed to S408.
In step S404, the ARM STM32 microprocessor 202 in control module 104 reads the dot array data of corresponding information to be displayed in character library flash memory 203 according to information to be displayed.Enter step S405 subsequently.
In step S405, dot array data by according to each sub regions the 16x16 dot matrix that controls carry out separation packing, proceed to step S409 subsequently.Because dot array data is the data that whole LED traffic guidance screen display is shown, present display screen has been divided into multiple subregion and has carried out distributed AC servo system, the display of every sub regions only control 16x16 LED dot matrix panel, therefore the lattice display data of whole screen need to be separated into multiple 16x16 dot array data bag, and then each 16x16 dot array data bag need send to by telegon 103 subregion that this packet is corresponding.
In step S406, control module 104 judges whether local LED traffic guidance screen has data upload remote control center 106, if need uploading data, proceeds to step S407, otherwise proceeds to step S402.
In step S407, control module 104 sends to communication module 105 by serial ports by needing the data uploading remote control center 106.Uploading data can be sent to remote control center by the mode such as optical fiber, 3G, GPRS by communication module 105 in time.
In step S408, control module 104 receives the command information from remote control center 106, proceeds to step S409 subsequently.
In step S409, the display data of all subregion are issued telegon 103 by serial ports by the ARM STM32 microprocessor 203 in control module 104.If the command information that what control module 104 received is from remote control center 106, then issue telegon 103 by command information through serial ports in this step.
The CC2530 on-chip system chip 3011 of a slice ZigBee technology is comprised in telegon 103, its major function coordinates to set up network, transmission network beacon, managing network node and storage networking nodal information, and provide the routing iinformation between associated nodes, the information such as memory node data equipment, data retransmission table and equipment contingency table.Foregoing coordinator function is completed by telegon built-in code, and in the present embodiment, telegon also needs additionally to realize two methods function: 1. with control module 104 two-way communication.2. two-way communication is carried out with display node.With control module 104 two-way communication, the dot array data that in the control module 104 on the one hand described in the serial ports of telegon 103 receives, ARM STM32 microprocessor 202 sends and order; Telegon 103 also needs status information etc. current for display node to feed back to control module 104 by serial ports on the other hand.Carry out two-way communication with display node to comprise the data that control module 104 received and be transmitted to each show node to broadcast (one-to-many communication) or clean culture (point-to-point communication) mode after inter-process; In addition data or the information of display node feeding back can also be received with mode of unicast.
Fig. 3 is display node hardware block diagram, and display node comprises terminal demonstration node 102 and route display node 101, two class display node adopts identical hardware design, all comprises high frequency core board 301 and low frequency base plate 302.High frequency core board 301 comprises the CC2530 on-chip system chip 3011 of a slice Zigbee technology; Low frequency base plate 302 comprises: LED drive unit 3021,16x16 LED dot matrix panel 3022, serial communication unit 3023 and humiture collection unit 3024
Route display node 101 and terminal demonstration node 102 all adopt the usefulness of this same hardware design of high frequency core board 301+ low frequency base plate 302 to be: the versatility and the interchangeability that 1. improve hardware circuit, the wireless distributed LED traffic guidance screen making different size is general at hardware, research and development speed can be accelerated like this, reduce cost of development, simultaneously for the maintain and repair methods of traffic guidance screen is provided convenience.In the structure of 2. described high frequency core board+low frequency base plate, high frequency core board processing cost is high, be designed to 4 layer printed circuit boards that area is less, low frequency base plate processing cost is low, be designed to 2 layer printed circuit boards that area is larger, such design effectively can reduce the processing cost of printed circuit board (PCB), thus reduces the hardware cost of monoblock LED traffic guidance screen.
CC2530 on-chip system chip 3011 on high frequency core board 301 realizes Zigbee network communication, complete terminal demonstration node 102 and show node communication 101 with route, the communication of the communication between route display node 101 and route display node 101 and telegon 103.CC2530 on-chip system chip 3011 also will the display of control 16x16 LED dot matrix panel 3022, and reads temperature and humidity sensing data from humiture collection unit 3024.In low frequency base plate 302, LED drive unit 3021 provides the drive current needed for display for 16x16 LED dot matrix panel 3022; 16x16 LED dot matrix panel 3022 is for Display of Chinese characters, western language and traffic bitmap; Serial communication unit 3023 is for showing debugging and the maintenance of node; Humiture collection unit 3024 is for gathering the temperature and humidity in subregion.
Route display node 101 be arranged in Zigbee network, the data issuing this display node can be received, also can receive other display node data, route show node 101 by address relatively after only process the data issuing this display node in inside.Route effect is played for the data routing node issuing other display node, it is transmitted to other node after these data being stored, therefore route display node 101 has two effects: the 16x16 lattice display completing this subregion on the one hand, then realizes routing function to the data issuing other display node on the other hand.
Terminal demonstration node 102 obtains display data from route display node 101, completes the 16x16 LED lattice display of this subregion, and needs the status information feeding back this terminal demonstration node 102 control work zone territories to route display node 101.Terminal demonstration node 102 self does not have routing function, can not other Display Vertices certificate of storage forwarding.
In the present embodiment, by the display node of 1/3 totally 16, be configured to route display node 101, other 2/3 display node totally 32, be configured to terminal demonstration node 102, more route display node 101 is there is in such system, each terminal demonstration node 102 can show node 101 with multiple route and communicate, its usefulness is: when certain route display node 101 breaks down, Zigbee network still automatically can configure other route display node 101 and provide or forwarding data for terminal demonstration node 102, thus effectively avoid large-area displays to lose efficacy, improve the reliability and stability of LED traffic guidance screen system work.
Fig. 5 is display node workflow diagram, and display node comprises route display node 101 and terminal demonstration node 102, and this process flow diagram starts from step S501.
In step S502, display node judges whether the subregion data receiving this display node control, if "Yes", proceeds to step S502, otherwise proceeds to step S506.
In step S503, determine whether to show data, if "Yes", proceed to step S504, otherwise proceed to step S507.
In step S504, receive display data laggard enter step S505.
In step S505, CC2530 on-chip system chip 3011 according to receiving new display data, controlling LED drive unit 3021, new display data being sent into 16x16 dot matrix panel and realizing upgrading display.
In step S506, route display node 101 have received the data issuing other display node, and route display node will fulfil routing function, and first data are stored into internal buffer, when network idle being detected, then forwarding data gives corresponding destination node.
In step S507, what display node received is order, and CC2530 on-chip system chip 3011 needs to perform which kind of order by determining.
In step S508, display node performs related command, performs temperature acquisition operation as controlled humiture collection unit 3024.
Communication module 105 is that remote control center 106 shield with LED traffic guidance the medium realizing two-way communication, and the effect of communication module 105 is: 1. obtain the display data of remote control center and order and by the display data of acquisition with order and send to control module 104 with serial mode; 2. display information, status information and failure message that the LED traffic guidance sent from serial ports reception control module 104 shields, then pass through optical cable mode by these information feed back to remote control center 106.
Remote control center 106 needs the various transit equipments controlled in certain region in highway network, the communication module 105 adopted in the present embodiment is that optical cable turns serial ports as the communication interface of communications intermediary equipment, such LED traffic guidance screen just can adopt changeless serial ports as communication interface, traffic guidance is shielded externally there is unified communication interface, improve the versatility of whole induced screen system.
Although describe embodiments of the present invention by reference to the accompanying drawings, in this area, those skilled in the art can make various changes and modifications within the scope of the appended claims.
Claims (1)
1. a wireless distributed LED traffic guidance screen system, is characterized in that wireless distributed LED traffic guidance screen system comprises: telegon (103), multiple route display node (101), multiple terminal demonstration node (102), a control module (104) and a communication module (105); Telegon (103) and multiple route show between node (101), all carry out two-way wireless communication between multiple route display node (101) and multiple terminal demonstration node (102); A serial ports of control module (104) is connected with telegon (103), and another serial ports of control module (104) is connected with communication module (105);
Telegon (103), information such as setting up Zigbee wireless network, managing network node, internodal routing iinformation is provided, storage networking node data is transmitted; Node (101) is shown and terminal demonstration node (102) carries out data communication with route; Obtain each sub regions display certificate and order with control module (104) two-way communication, and feed back each sub regions status information to control module (104);
Route display node (101), communicates with terminal demonstration node (102) with telegon (103), stores the data in Zigbee network, merges and forwarding; Control 16x16 LED dot matrix panel (3022) shows, and reads the data of humiture collection unit (3024);
Terminal demonstration node (102), shows node (101) with route and communicates, and obtains display data and order, and subregion status information belonging to feedback, control 16x16 LED dot matrix panel (3022) shows, and reads the data of humiture collection unit (3024);
Control module (104), explains and process LED traffic guidance shields the communication protocol with remote control center (106); In character library flash memory (203), read the dot array data of word to be shown according to displaying contents, and pack respectively according to each 16 × 16 LED dot matrix subregion that induced screen divides; Dot array data bag corresponding for all subregion is sent to telegon (103) through serial ports; The status information of feedback LED traffic guidance screen is to remote control center (106);
Communication module (105), by optical cable, 3G, GPRS or, RS485 mode and remote control center (106) two-way communication, obtain display data and order on the one hand, feedback induced screen state is to remote control center (106) on the other hand; Communication module (105) also realizes two-way communication by serial ports and control module (104), forward the display data of remote control center (106) on the one hand and order to control module (104), obtaining the induced screen status information that control module (104) transmits on the other hand;
Route display node (101) and terminal demonstration node (102) include: high frequency core board (301) and low frequency base plate (302); High frequency core board (301) comprises a slice CC2530 on-chip system chip (3011); Low frequency base plate (302) comprises: LED drive unit (3021), 16x16 LED dot matrix panel (3022), serial communication unit (3023) and humiture collection unit (3024); High frequency core board (301) is connected with double socket by double contact pin with low frequency base plate (302); CC2530 on-chip system chip (3011) is connected to LED drive unit (3021), humiture collection unit (3024) and serial communication unit (3023) through double contact pin and double socket; LED drive unit (3021) connects 16x16 LED dot matrix panel (3022) again;
CC2530 on-chip system chip (3011), realizes Zigbee network interior joint and telegon (103), and the radio communication between node; Control 16x16 LED dot matrix panel (3022) shows, and reads humiture collection unit (3024) data;
LED drive unit (3021), for 16x16 LED dot matrix panel (3022) display provides drive current;
16x16 LED dot matrix panel (3022), each pixel is made up of red, green, yellow three look multiple LED, forms 16x16 dot matrix, for showing information and traffic bitmap;
Serial communication unit (3023), shows debugging and the maintenance of node (101) and terminal demonstration node (102) for route;
Humiture collection unit (3024), includes temperature and moisture sensors, can obtain the temperature and humidity information of subregion belonging to display node;
Control module (104) comprising: ARM STM32 microprocessor (202), ambient light sensing unit (201), character library flash memory (203); On the I/O that ambient light sensing unit (201) and character library flash memory (203) are all connected to ARM STM32 microprocessor (202) and I/O pin;
ARM STM32 microprocessor (202), realizes the data communication with communication module (105), telegon (103), reads the outer monochrome information of screen that surround lighting sensing unit (201) gathers, operation character library flash memory (203);
Ambient light sensing unit (201), comprises and is arranged on LED traffic guidance screen top, three of the front and back silicon photocell sensors gathering surround lightings;
Character library flash memory (203), for storing GB Chinese character, the dot array data of western language and traffic bitmap lattice information.
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| CN105120551A (en) * | 2015-07-13 | 2015-12-02 | 苏州大学 | BME technology-based wireless LED control system and method |
| CN106251801A (en) * | 2016-08-09 | 2016-12-21 | 上海展荟诗实业有限公司 | A kind of RGB scalable color light emitting device drive system and method |
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| CN104464622B (en) | 2017-02-22 |
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Application publication date: 20150325 Assignee: Guangxi Langyuantong Technology Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000043 Denomination of invention: Wireless distributed LED traffic guidance screen system Granted publication date: 20170222 License type: Common License Record date: 20221117 |
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