CN113269978A - Intelligent bus electronic stop board system based on Mesh ad hoc network - Google Patents
Intelligent bus electronic stop board system based on Mesh ad hoc network Download PDFInfo
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- CN113269978A CN113269978A CN202110545992.6A CN202110545992A CN113269978A CN 113269978 A CN113269978 A CN 113269978A CN 202110545992 A CN202110545992 A CN 202110545992A CN 113269978 A CN113269978 A CN 113269978A
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- bus
- module
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- vehicle
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams
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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
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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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
Abstract
The invention provides a Mesh ad hoc network-based intelligent electronic bus stop board system, which belongs to the field of electronic stop boards and comprises a vehicle-mounted module arranged on a bus, and a stop module and a display module arranged at each bus stop; the vehicle-mounted module comprises a vehicle-mounted main controller and a video image processing module in communication connection with the vehicle-mounted main controller; the platform module comprises a platform main controller and a data transmission radio station module in communication connection with the platform main controller; the video image processing module sends videos through the raspberries to process the situations that passengers get on or off the bus from front doors to back doors, so that the seating rate of the bus is obtained, the current station where the bus is located is visually displayed on the electronic station board of each station through the LEDs, the current seating rate situation is displayed through different colors of the LED lamps, and the number of stations at the station is displayed through the nixie tube. The communication principle of the system is innovative, the communication between the bus and the platform and between the platform and the platform is realized by the self-organized chain type network, the intervention of the internet and a network operator is not needed, a GPS is not needed, and the operation cost is not needed.
Description
Technical Field
The invention belongs to the technical field of electronic bus stops, and particularly relates to an intelligent bus electronic bus stop board system based on a Mesh ad hoc network.
Background
With the continuous acceleration of the urbanization process of the current society, more and more populations begin to gather together to form towns. Due to the fact that the population is large, the town range is continuously enlarged, and in order to solve the problem of urban traffic jam, the lines and the number of urban buses are increased rapidly. With the increasing demand of people for infrastructure, the traditional electronic stop board can not meet the demand of passengers.
The intelligent electronic bus stop board adopts a new generation application system organically combining global positioning navigation (GPS), wireless network communication, a Geographic Information System (GIS) and an intelligent sensor, fully utilizes the current intelligent scheduling management system, and establishes a bus arrival forecasting system through technical butt joint.
The electronic bus stop board manufacturers in China basically adopt a global positioning navigation technology (GPS), a geographic information system technology (GIS), an intelligent sensor, a 3G/4G internet technology and a video and voice communication technology, and need to operate communication manufacturers for linkage butt joint.
Therefore, the invention provides an intelligent bus electronic stop board system based on a Mesh ad hoc network.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an intelligent bus electronic stop board system based on a Mesh ad hoc network.
In order to achieve the above purpose, the invention provides the following technical scheme:
an intelligent bus electronic stop board system based on Mesh ad hoc network comprises a vehicle-mounted module arranged on a bus, and a stop module and a display module arranged at each bus stop;
the vehicle-mounted module comprises a vehicle-mounted main controller and a video image processing module in communication connection with the vehicle-mounted main controller;
the video image processing module is connected with the vehicle-mounted video equipment and is used for processing video image information acquired by the vehicle-mounted video equipment to obtain data of the getting-on/off state of passengers at front and rear doors of the bus so as to obtain the seating rate information of the bus;
the vehicle-mounted main controller receives and processes the data of the passengers getting on and off the bus to obtain the information of the seating rate of the bus; the seating rate information is sent to the platform module of the platform where the bus arrives through a short-distance communication module;
the platform module comprises a platform main controller and a data transmission station module in communication connection with the platform main controller; the data transmission radio station modules of different station modules communicate with each other through the long-distance communication module to form a wireless Mesh ad hoc network structure;
the platform main controller receives the seat-up rate information sent by the vehicle-mounted main controller, acquires the bus position information and processes the bus position information and the seat-up rate information; transmitting a processing result to the data transmission radio station module of the next station one by one according to a chain type self-organized network through the data transmission radio station module, so as to realize remote data transmission among different platform modules, and further enable other platforms to obtain the position information of the bus at the position of the bus at the next station;
the display module is used for displaying the processing result of the platform master controller.
Preferably, the display module comprises an LED screen display part, an LED lamp display part and a nixie tube display part;
the LED screen display part displays the current bus position information;
the LED lamp display part displays the current seating rate information by different colors of the LED lamps;
the nixie tube display part displays the number of the stations where the bus arrives at the station in the latest bus.
Preferably, the video image processing module processes the collected front and back door passenger boarding and disembarking image information through raspberry dispatching videos.
Preferably, the nixie tube display part consists of ULNs 2803, 74LS373, 74LS7447 and a nixie tube, the nixie tube group consists of diodes with common anodes, the cathodes of the diodes receive '0' signals to shine, the 74LS7447 controls the numerical value displayed by the nixie tube, the STLS373 latches the current state, and the ULN2803 provides driving voltage.
Preferably, the LED screen display part displays the result by L LEDs, 74LS138 controls the LED display, 74LS373 latches the current state, and ULN2803 provides the driving voltage.
Preferably, the long-distance communication module is a wireless data transmission station E90DTU, and the wireless data transmission station E90DTU performs data transmission through an RS232 communication protocol to realize long-distance communication and data transmission between stations.
Preferably, the short-range communication module is an NRF24L01 chip, and the NRF24L01 chip implements short-range communication between the vehicle-mounted module and the platform module through an SPI communication protocol.
Preferably, the vehicle-mounted main controller and the platform main controller are respectively an ST89C52 single chip microcomputer, and the input and output of signals are completed through serial ports.
Preferably, the power supply system further comprises a power supply module, wherein the power supply module comprises a voltage-stabilized power supply module, a single-chip microcomputer power supply module and a display power supply module and supplies power to the system.
Preferably, the voltage-stabilized power supply module consists of a transformer circuit, a bridge rectifier circuit and a filter circuit.
The intelligent bus electronic stop board system based on the Mesh ad hoc network has the following beneficial effects:
(1) the communication principle is innovative, the communication between the bus and the platform and between the platform and the platform is realized by the self-organized chain type network, the intervention of the internet and a network operator is not needed, a GPS is not needed, and the operation cost is not needed.
(2) The nixie tube and the background light are used on the electronic stop board to display the visual image of the corresponding driving position of the bus, so that passengers waiting for the bus can conveniently wait for the bus.
(3) The power consumption is low, the working state only needs to be displayed by an LED nixie tube, and other equipment is in a standby state.
(4) Each station only needs to be provided with one set of the device and can be used for all the buses.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the invention and it will be clear to a person skilled in the art that other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic block diagram of an intelligent bus electronic stop board system based on Mesh ad hoc network according to embodiment 1 of the present invention;
FIG. 2 is a circuit diagram of a display portion of an LED screen;
FIG. 3 is a control diagram of a display portion of an LED screen;
FIG. 4 is a partial view of FIG. 3;
fig. 5 shows a display of a stop sign according to the present embodiment.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention and can practice the same, the present invention will be described in detail with reference to the accompanying drawings and specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The invention provides an intelligent bus electronic stop board system based on Mesh ad hoc network, which is specifically shown in figure 1 and comprises a vehicle-mounted module arranged on a bus, and a platform module and a display module arranged at each bus platform;
the vehicle-mounted module comprises a vehicle-mounted main controller and a video image processing module in communication connection with the vehicle-mounted main controller;
the video image processing module is connected with the vehicle-mounted video equipment and is used for processing video image information acquired by the vehicle-mounted video equipment to obtain data of the getting-on/off state of passengers at front and rear doors of the bus so as to obtain the seating rate information of the bus;
the vehicle-mounted main controller receives and processes the data of the passengers getting on and off the bus to obtain the seating rate information of the bus; the seat-loading rate information is sent to a platform module of a platform where the bus arrives through a short-distance communication module;
the platform module comprises a platform main controller and a data transmission radio station module in communication connection with the platform main controller; the data transmission radio station modules of different station modules communicate with each other through the long-distance communication module to form a wireless Mesh ad hoc network structure;
the platform main controller receives the seat occupancy rate information sent by the vehicle-mounted main controller, acquires the bus position information and processes the bus position information and the seat occupancy rate information; transmitting the processing result to the data transmission radio station module of the next station one by one according to the chained self-organized network through the data transmission radio station module, so as to realize the remote data transmission among different station modules, and further enable other stations to obtain the position information of the bus in and out;
the display module is used for displaying the processing result of the platform master controller.
In this embodiment, the main function of each of the vehicle-mounted main controller and the platform main controller is the ST89C52 single chip microcomputer, which is to process information and complete input and output of signals through a serial port.
Further, in this embodiment, the display module includes an LED screen display portion, an LED lamp display portion, and a nixie tube display portion;
the LED screen display part displays the current bus position information, namely visually displays the current station of the bus;
the LED lamp display part displays the current seating rate information by different colors of the LED lamps;
the nixie tube display part displays the number of the stations where the bus arrives at the station in the latest bus.
Further, in this embodiment, the video image processing module processes the collected front and rear door passenger boarding and alighting image information through the raspberry dispatching video.
Further, in this embodiment, the nixie tube display portion is composed of the ULN2803, 74LS373, 74LS7447 and a nixie tube, the nixie tube group is composed of diodes with common anodes, the cathodes of the diodes receive '0' signals to light up, the 74LS7447 controls the numerical value displayed by the nixie tube, the STLS373 latches the current state, and the ULN2803 provides a driving voltage.
Further, in the present embodiment, as shown in fig. 2 to fig. 4, the LED screen display part displays the result by the LED light emitting diode, 74LS138 controls the LED display, 74LS373 latches the current state, and the ULN2803 provides the driving voltage.
Further, in this embodiment, the long-distance communication module is a wireless data transfer station E90DTU, and the wireless data transfer station E90DTU performs data transmission through an RS232 communication protocol to implement long-distance communication and implement data transmission between stations. The farthest communication distance is 5.1Km, the signal transmission is stable, and the working state is normal. When in test, one end outputs the OXFF, and the other end receives a signal which is also 0 XFF.
Further, in the present embodiment, the short-range communication module is an NRF24L01 chip, and the NRF24L01 chip implements short-range communication between the vehicle-mounted module and the platform module through an SPI communication protocol. Through NRF24l01 radio frequency chip, utilize the singlechip to be connected with it, realize data signal transmission and receipt between the radio frequency chip, signal transmission is stable, and operating condition is normal.
Further, in this embodiment, the display device further includes a power module, where the power module includes a voltage-stabilized power supply module, a single-chip power supply module, and a display power supply module, and supplies power to the system.
Further, in this embodiment, the voltage-stabilized power supply module includes a transformer circuit, a bridge rectifier circuit, and a filter circuit, where the transformer circuit reduces an input 220V ac power to a suitable ac power, the bridge rectifier circuit converts the ac power to a suitable dc power, and the filter circuit stabilizes voltage output. And can increase the auxiliary power supply of the solar panel to form an independent power supply system
In the electronic bus stop board system provided by the embodiment, the arrival information of the bus is automatically given after the bus arrives at the bus stop, the arrival information of the bus is transmitted to the next bus station by station according to a chain type ad hoc network by wireless communication according to a line, and the position of the bus at which the bus arrives at the next bus station is visually displayed on each electronic bus stop board through an LED.
The nixie tube for the stop board provided by the embodiment visually displays the stop number information of the nearest bus to the stop, and the LED lamp displays the bus information on the route, the time of the first and last bus and the information of the passing stop of the route. The bus stop device is convenient for passengers to master the driving position information of the bus and does not stop when waiting for the bus.
The position information of the bus is displayed on the electronic stop board by using the nixie tube and the background light, the display is visual and the picture is simple, and the display method is not limited by the total number of the buses and only needs to be within the allowable range of the area of the bus stop board. Taking a bus on a certain route in a host city as an example, a station board is shown in fig. 5, the station name of the embodiment is a host college, the host college of the station name can be represented by red, a large-size nixie tube indicates that the coming bus also has several stations to the station, if 5 stations are arranged at the nearest 5-way distance from the station, the yellow background light is lighted to indicate the positions of the next buses, the positions of the next buses are represented by the positions framed by rectangles in fig. 5, the last round-dot type LED indicates that the last bus is lighted to indicate that the last bus is sent, and the light stops the bus and does not send the next bus.
The bus electronic stop board system provided by the embodiment has no intervention of an operator and does not need the supplement content of a GPS; the method is characterized in that bus station chain type arrangement is set for a bus route, the distance between a bus station and the bus station is about 2-3 kilometers, and the bus per se runs along the chain line station in one direction. The bus and the station where the bus will arrive adopt short-distance Radio Frequency Identification (RFID) radio communication; and low-power wireless Mesh ad hoc networks are adopted among the stations along the line, and information packets are transmitted from the bus to the stations and then are transmitted to the terminal station along the line in a chain manner step by step. The requirement of chain type step-by-step transmission on wireless transmitting power is low, and because of the self-organized network, the wireless transmitting power transmission method does not need to be in butt joint with a mobile communication operator, does not have network operation cost, does not need GPS and GID information, and greatly reduces equipment cost; RFID identification and data transmission of buses entering and exiting bus stops, low-power wireless Mesh ad hoc network synchronization of data transmission between adjacent bus stops, bus attendance rate information processing and transmission, and visual display of bus position information and attendance rate information on a bus electronic stop board.
The system has been used for carrying out communication tests with the distance of 7 kilometers outdoors, and 2-station tests are completed in the actual bus line, so that the functional effect is verified, and the design requirements are met.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. An intelligent electronic bus stop board system based on Mesh ad hoc network is characterized by comprising a vehicle-mounted module arranged on a bus, and a stop module and a display module which are arranged at each bus stop;
the vehicle-mounted module comprises a vehicle-mounted main controller and a video image processing module in communication connection with the vehicle-mounted main controller;
the video image processing module is connected with the vehicle-mounted video equipment and is used for processing video image information acquired by the vehicle-mounted video equipment to obtain data of the getting-on/off state of passengers at front and rear doors of the bus so as to obtain the seating rate information of the bus;
the vehicle-mounted main controller receives and processes the data of the passengers getting on and off the bus to obtain the information of the seating rate of the bus; the seating rate information is sent to the platform module of the platform where the bus arrives through a short-distance communication module;
the platform module comprises a platform main controller and a data transmission station module in communication connection with the platform main controller; the data transmission radio station modules of different station modules communicate with each other through the long-distance communication module to form a wireless Mesh ad hoc network structure;
the platform main controller receives the seat-up rate information sent by the vehicle-mounted main controller, acquires the bus position information and processes the bus position information and the seat-up rate information; transmitting a processing result to the data transmission radio station module of the next station one by one according to a chain type self-organized network through the data transmission radio station module, so as to realize remote data transmission among different platform modules, and further enable other platforms to obtain the position information of the bus at the position of the bus at the next station;
the display module is used for displaying the processing result of the platform master controller.
2. The Mesh ad-hoc network-based intelligent electronic bus stop board system as claimed in claim 1, wherein the display module comprises an LED screen display part, an LED lamp display part and a nixie tube display part;
the LED screen display part displays the current bus position information;
the LED lamp display part displays the current seating rate information by different colors of the LED lamps;
the nixie tube display part displays the number of the stations where the bus arrives at the station in the latest bus.
3. The Mesh ad-hoc network-based intelligent electronic bus stop board system as claimed in claim 1, wherein the video image processing module processes collected front and back passenger boarding and disembarking image information through raspberry sending video.
4. The Mesh ad-hoc network-based intelligent bus electronic stop board system as claimed in claim 2, wherein the nixie tube display part is composed of ULN2803, 74LS373, 74LS7447 and a nixie tube, the nixie tube group is composed of diodes with common anodes, the cathode of the diode receives a '0' signal to shine, 74LS7447 controls the numerical value displayed by the nixie tube, STLS373 latches the current state, and ULN2803 provides a driving voltage.
5. The Mesh ad-hoc network based intelligent electronic bus stop board system as claimed in claim 2, wherein the LED screen display part displays the result by L LED LEDs, 74LS138 controls LED display, 74LS373 latches the current status, and ULN2803 provides the driving voltage.
6. The Mesh ad hoc network-based intelligent electronic bus stop board system according to claim 1, wherein the long-distance communication module is a wireless data transfer station E90DTU, and the wireless data transfer station E90DTU performs data transmission through an RS232 communication protocol to realize long-distance communication and data transmission between stations.
7. The Mesh ad-hoc network-based intelligent electronic bus stop board system as claimed in claim 1, wherein the short-range communication module is an NRF24L01 chip, and the NRF24L01 chip implements short-range communication between the vehicle-mounted module and the platform module through an SPI communication protocol.
8. The Mesh ad-hoc network-based intelligent electronic bus stop board system as claimed in claim 1, wherein the vehicle-mounted master controller and the station master controller are respectively an ST89C52 single chip microcomputer, and signal input and output are accomplished through serial ports.
9. The Mesh ad hoc network-based intelligent electronic bus stop board system according to claim 8, further comprising a power supply module, wherein the power supply module comprises a voltage-stabilized power supply module, a single-chip microcomputer power supply module and a display power supply module, and supplies power to the system.
10. The Mesh ad hoc network-based intelligent bus electronic stop board system according to claim 9, wherein the voltage-stabilized power supply module is composed of a transformer circuit, a bridge rectifier circuit and a filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110545992.6A CN113269978A (en) | 2021-05-19 | 2021-05-19 | Intelligent bus electronic stop board system based on Mesh ad hoc network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110545992.6A CN113269978A (en) | 2021-05-19 | 2021-05-19 | Intelligent bus electronic stop board system based on Mesh ad hoc network |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007040947A (en) * | 2005-08-04 | 2007-02-15 | Minoru Ueda | Guidance device by portable telephone with gps function |
| CN101393685A (en) * | 2008-10-28 | 2009-03-25 | 上海第二工业大学 | Electronic public transport stop board realizing relay type communication by using ISM frequency band |
| CN102867431A (en) * | 2012-09-19 | 2013-01-09 | 江苏省交通规划设计院股份有限公司 | Zigbee and RFID (Radio Frequency Identification) technology-based electronic bus stop board broadcasting system and method |
| CN103198649A (en) * | 2013-03-26 | 2013-07-10 | 天津斯凯沃德信息科技有限公司 | Intelligent bus station board system |
| CN103886741A (en) * | 2014-03-13 | 2014-06-25 | 河海大学常州校区 | System and method for bus management based on intelligent bus card |
| CN106781617A (en) * | 2016-12-26 | 2017-05-31 | 东莞产权交易中心 | A kind of bus stop board method for visualizing |
| CN208225296U (en) * | 2018-04-28 | 2018-12-11 | 深圳柯赛标识工程有限公司 | A kind of intelligent Electronic Bus Stand |
| CN109862538A (en) * | 2019-01-08 | 2019-06-07 | 河北亿程交通科技有限公司 | WMN cyber city intelligent bus communication network system based on Ad Hoc and Mesh |
-
2021
- 2021-05-19 CN CN202110545992.6A patent/CN113269978A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007040947A (en) * | 2005-08-04 | 2007-02-15 | Minoru Ueda | Guidance device by portable telephone with gps function |
| CN101393685A (en) * | 2008-10-28 | 2009-03-25 | 上海第二工业大学 | Electronic public transport stop board realizing relay type communication by using ISM frequency band |
| CN102867431A (en) * | 2012-09-19 | 2013-01-09 | 江苏省交通规划设计院股份有限公司 | Zigbee and RFID (Radio Frequency Identification) technology-based electronic bus stop board broadcasting system and method |
| CN103198649A (en) * | 2013-03-26 | 2013-07-10 | 天津斯凯沃德信息科技有限公司 | Intelligent bus station board system |
| CN103886741A (en) * | 2014-03-13 | 2014-06-25 | 河海大学常州校区 | System and method for bus management based on intelligent bus card |
| CN106781617A (en) * | 2016-12-26 | 2017-05-31 | 东莞产权交易中心 | A kind of bus stop board method for visualizing |
| CN208225296U (en) * | 2018-04-28 | 2018-12-11 | 深圳柯赛标识工程有限公司 | A kind of intelligent Electronic Bus Stand |
| CN109862538A (en) * | 2019-01-08 | 2019-06-07 | 河北亿程交通科技有限公司 | WMN cyber city intelligent bus communication network system based on Ad Hoc and Mesh |
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