CN106781612A - Using half wave communication and bus station's display system of ZigBee - Google Patents
Using half wave communication and bus station's display system of ZigBee Download PDFInfo
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- CN106781612A CN106781612A CN201710162556.4A CN201710162556A CN106781612A CN 106781612 A CN106781612 A CN 106781612A CN 201710162556 A CN201710162556 A CN 201710162556A CN 106781612 A CN106781612 A CN 106781612A
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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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
Using half wave communication and bus station's display system of ZigBee, each of which bus station constitutes bus arrival information query system, Zigbee radio communication transmission informations are used between bus station and bus, public bus network realizes that information is exchanged between each bus station using the wave communication of power line half, and passenger can utilize the network port that mobile phone A PP log in computer to obtain each road bus arrival information.
Description
(1) technical field：
Each bus station constitutes bus arrival information query system, is penetrated using Zigbee between bus station and bus
Frequency communicating information, public bus network realizes that information is exchanged between each bus station using the wave communication of power line half, and passenger is available
The network port that mobile phone A PP logs in computer obtains each road bus arrival information.
(2) background technology：
With flourishing for public transport cause, increasing people starts the trip that takes bus, urban public bus lines with
The development for public transport cause rapidly increases, therefore road is also more and more crowded, and passenger's waiting time by bus becomes very uncertain,
The crowded passenger on public transport having of bus for causing but seldom, because crowded bus number many times of getting on or off the bus are long,
Each station is required for stopping the longer time, if passenger can know that each circuit bus arrival information, avoiding congestion circuit can
To alleviate public bus network jam situation to a certain extent, while be also convenient for passenger riding.
The existing intelligent bus stop board system based on GPS global locations, the extension GPS functions of being provided by the system are right
Public transit vehicle carries out real-time satellite positioning, although can in real time grasp the letter such as the current position of public transit vehicle, travel speed, direction
Breath, but the system architecture complex and expensive very flexible based on GPS global locations, and many high buildings and large mansions in city, some areas
Satellite-signal is not smooth, therefore influence popularization, and only super-large city just has on probation at present.
(3) content of the invention：
The system is provided with the master controller of bus station in public transport terminus, and each bus station is provided with public transport stand control
Device, master controller passes through power line half-wave constructing communication network with each public transport station control.Each bus is provided with Vehicle Controller
Exchanged for carrying out wireless communication information with public transport station control, the simple cheap signal stabilization of system architecture is good.
The cycle discriminator circuit structural representation of master controller and each public transport station control is as shown in Fig. 2 by two uses
The voltage comparator composition of hysteresis loop comparator, two comparators are separately positioned on the positive half cycle descending branch of cycle, crest voltage
Used as the place of point 1 and 30% to 45% is screened as point 2 is screened, the positive half cycle descending branch of cycle is close to communication disruption at 60% to 80% place
At the breakpoint of INT1, screen point and be arranged near the breakpoint of communication disruption INT1, filter off most of interference, and make communication in week
The position of the negative half-wave of ripple is more accurate.Include filter circuit in each voltage comparator, the reference voltage of its voltage comparator by
Mu balanced circuit is provided, and comparator input terminal is followed by through signal condition, resistance step-down, partial pressure, voltage stabilizing from electric power netting twine.
As shown in figure 1, at cycle zero passage, that is, screening point 0 and setting voltage zero-cross detection module, it uses cycle positive half-wave
Signal sends into the clock end CLK of d type flip flop, D triggerings after further isolating negative half period, signal condition through electric resistance partial pressure, diode
Q termination microcontrollers the external interrupt mouthful INT0, the external interrupt mouthful INT0 of device are arranged to level triggers, the D terminations of d type flip flop
Ground, S I/O mouthfuls of microcontrollers of termination, usually puts 1 for the I/O mouthfuls.When cycle positive half-wave signal arrives, CLK signal immediately after
Rising edge makes d type flip flop Q ends be 0, microcontroller external interrupt mouthful INT0 low levels, so as to produce interruption, the break period is T0,
Timing at the T0, through 5MS time delays, the electric output voltage for pressing comparator ﹙ V1 ﹚ in point T1 places is screened in microcontroller scanning, works as week
During the threshold voltage of wave voltage Da Dao ﹙ V1 ﹚, output voltage produces saltus step, scanning to record timing time t1 during its saltus step；Equally
Scanning record screens the time t2 of electricity pressure comparator ﹙ V2 ﹚ output voltage saltus steps at point T2, and t1, t2 is corresponding with t1, t2 respectively
Bound-time setting value Ts1, Ts2 make comparisons；If in the range of allowable error, the cycle signal for detecting be it is true,
Otherwise it is false.Be the disconnected INT1 in the fictitious time Central Shanxi Plain, perform to interrupt and return, when for it is true when d type flip flop set to 0, execute instruction：Open interruption
INT1, described I/O mouthfuls set to 0, the disconnected INT0 in the Central Shanxi Plain, described I/O mouthfuls put 1.
Lock in time uses the product multiplied to the stored count value N of grid cyclic wave and the average time T-phase of one cycle of power network,
Along with the clocking value Ts between timing time point ti and grid cyclic wave integer value obtains lock in time TZ, its grid cyclic wave it is flat
The equal time is that the measured value of 100 grid cyclic wave times is taken into it in grid cyclic wave counting process to be averagely worth to.
System is the lock in time communication in agreement.It is each in the telecommunication circuit of each station control and main controller to install one
Communications electronics switch, switch drive module.The switch drive module of communications electronics switch is through resistance step-down, letter from electric power netting twine
Number conditioning and the anti-phase CLK ends for being followed by d type flip flop A, the external interrupt mouthful INT1 of the Q termination microcontrollers of d type flip flop A, in this
Fracture is set to level triggers.The D ends ground connection of d type flip flop A, its S end connects with I/O mouthfuls of microcontroller, and original state S puts at end
1.When the positive square-wave signal at CLK ends arrives, its rising edge makes d type flip flop set to 0 middle fracture INT1 low levels generation interruption, in
First it is followed by believing electronic switch all through 0.5MS time delays in disconnected service routine, starts timing, and set to 0 S ends, d type flip flop puts 1 i.e. Q
Hold as 1 the disconnected INT1 in the Central Shanxi Plain, then communicated, communications electronics switch according to microcontroller respective end is connected to using communication mode
Mouthful, and signal condition is carried out, the sign off of this cycle within timing 9MS, shut-off communications electronics switch, S puts at end 1 to be made out
The communication of the disconnected next cycle of wait, so goes round and begins again and realizes half wave communication.Main controller is to each stand control during this sign off
Device sends shut-off communications electronics switch, the instruction of the disconnected INT1 in the Central Shanxi Plain.
The signal source of bus distance travelled is the kilometer sensor on speed changer or hub for vehicle wheel, to mileage
Table sensor output pulse signal is counted can reflect wheel revolutions, obtain speed and distance travelled information, mileometer sensing
Device output signal through level shifting circuit, low-pass filter circuit it is anti-interference after output signal is accurately caught by microcontroller ports
Identification is caught, microcontroller ports are re-fed into.Mileage between the Vehicle Controller of each circuit bus preset each station, to obtain
Position in traveling.When bus communicates with bus station, if public transport station control does not have bus in the time interval of setting
Arrive at a station, when being communicated with first bus for arriving at a station afterwards, marking signal M is sent in addition, the Vehicle Controller of bus will be marked
The actual measurement mileage that arrives at a station for having M compares calculating and arrives at a station mileage error with setting mileage, takes the mileage error of arriving at a station of more than 5 times
Value, is left out by setting ratio number of times and is up to station error for several times, and remaining is averaged as offset, for correcting in measurement
Journey.The time interval of the setting need to ensure while the bus for arriving at a station all leaves, and the next bus that arrives at a station is arrived at a station
Stop position.Its speed of some vehicles is exported with mileage signal using bus signals, then by its vehicle speed mileage data transmission unit
Obtain speed, mileage.
Bus is respectively provided with radio-frequency communication module with bus station, realizes that the wireless messages between bus and bus station are passed
Pass.Radio-frequency communication module selects CC2530 modules, it is also possible to from the Zigbee module of other microcontrollers.CC2530 is TI public
It is a based on SOC (on-chip system) that department produces, and supports IEEE802.15.4, ZigBee, ZigBee PRO standards, integrated chip
2.4GHZ DSSS RF transceivers, the industrial microcontroller of stage enhancement type 8051, ZigBee are low-power consumption, low data speed
The radio network technique of rate, low cost, most codes of Zigbee protocol stack are all public, are thus considerably increased
The portability of project, its application layer characteristic information is stored in ZigBee.def files, used as application development
A part, will change this document and set according to actual conditions.
ZigBee working frequencies are 2.380GHz~2.500Ghz, totally 26 channels, support FHSS, can effectively be kept away
Exempt from the band interference of itself, it is also possible to which its extended frequency band avoids the interference of WIFI, and support that the carrier wave multichannel of conflict avoidance is intercepted
Technology (CSMA-CA) is when application program needs to deliver a packet to one group of equipment on network, it is possible to use group addressing side
Formula can also carry out the configuration of the network topology parameters such as transmission power, channel to module.Channel is arranged as required to during communication, and
It is arranged to transmitter mode or receiver mode.
Vehicle Controller is connected to 8051 micro-controls in CC2530 modules by CC2530 module compositions, public transport car kilometer output signal
I/O mouthfuls of device processed, is stored in the flash memory in its chip after being directly read by 8051 microcontrollers, the communication number of Vehicle Controller
According to the block update mode for also pressing data in flash memory, it is stored in the flash memory of its CC2530 chip.
Each bus station constitutes bus arrival information query system, and each public transport station control is according to the station bus
Line Address cycles through detection signal, realizes that information is handed over bus station after the Vehicle Controller response of the bus of parking of arriving at a station
Change, arrived at a station simultaneously during to channel transmission answer signal with many buses of circuit, public transport station control will continuously receive several
Wrong data bag or the intensity listened to after channel signals superposition transfinite, and illustrate that present channel is interfered, at this moment, each bus
By between its parking spot and site location apart from S, by bus travel direction, since 6 meters of site location is exceeded forward, from
It is dynamic, backward to 18-60 meters of point leaving from station, to fall into described Serial Number Range by S values to number according to every 6 meters of range incrementation numberings, on
Note generally there was only 2 to 3 cars while arriving at a station when stating setting.Public transport station control is to the bus disturbing line that arrives at a station according to the volume
Number order retransmits detection signal, as produced interference again if to the bus of failed communication, reduce described every 6 meters of scopes
Value does not repeat to number again, repeats said process to interference is not produced, and its numbering fails to during the next stop.When circuit possesses public transport
The preset numbering that will not be failed using fixation during car negligible amounts.
Bus station communicates with bus and is also adopted by the different communication Channel cyclical setting of neighbor stations, uplink and downlink
Road site communication channel of the same name staggers and uses, and prevents co-channel interference.Bus is automatic after reaching terminal to change communication letter
Road and website order are set, and public transport station control will arrive at a station send display to show after information processing, be easy to passenger to check.
The main controller that public transport terminus is set is connected by coupled computer and Internet, and passenger can profit
The network port for logging in the computer with mobile phone A PP obtains the number in the bus arrival information of supervising software Zhong Ge roads
According to.
(4) illustrate：
Fig. 1 is cycle discriminator circuit principle schematic；
Fig. 2 is the circuit structure block diagram of the bus station's display system using half wave communication and ZigBee.
(5) specific embodiment：
Circuit structure block diagram using half wave communication and bus station's display system of ZigBee is as shown in Figure 2, comprising:
Master controller (1), public transport station control (3), the Vehicle Controller (4) of bus；Wherein Vehicle Controller (4) by
Zigbee radio-frequency communication modules and kilometer sensor are constituted, and Zigbee radio-frequency communication modules select CC2530 modules, bus
The mileage output signal of kilometer sensor is connected to I/O mouthfuls of 8051 microcontrollers in CC2530 modules, Vehicle Controller (4)
Transceiving data is stored in the flash memory of its CC2530 chip.
Master controller (1), public transport station control (3) are opened by Zigbee radio-frequency modules, cycle discriminator circuit, communications electronics
Close, switch drive module and LCD display are constituted, wherein master controller (1) is connected to by coupled computer
Internet (2).Zigbee radio-frequency communication modules select CC2530 modules, and 8051 microcontrollers are additionally operable in CC2530 modules
Control cycle discriminator circuit, communications electronics switch and switch drive module.
The data of arriving at a station of each public bus network are stored in the flash memory of CC2530 chips in bus station, and LCD display includes LCD
Drive circuit and LCD display, LCD display are connected with I/O mouthfuls of 8051 microcontrollers in CC2530 modules, LCD display
Information of arriving at a station for showing public bus network.
Cycle discriminator circuit is made up of input circuit, voltage zero-cross detection module and voltage comparator.Input circuit is used for
By mains AC voltage by resistance and the partial pressure of diode, the input voltage of voltage comparator suitably stabilization is converted to.
Voltage zero-cross detection module d type flip flop, voltage comparator selects LM393, and its reference voltage is using mu balanced circuit stabilization electricity
Press the threshold voltage of comparator.Communications electronics switch uses reverse-blocking tetrode thyristor, and switch drive module is triggered comprising input circuit and D
Device.
Claims (2)
1. using half wave communication and bus station's display system of ZigBee, it is characterized in that public transport terminus sets master controller, respectively
Bus station sets public transport station control, and master controller is with each public transport station control by the wave communication of power line half, each bus
Installing Vehicle Controller is used to carry out radio communication with public transport station control；
The cycle discriminator circuit of master controller and each public transport station control is made up of two voltage comparators, two comparator difference
It is arranged on the positive half cycle descending branch of cycle, 60% to 80% place of crest voltage is used as screening the place of point 1 and 30% to 45% as Zhen
Other point 2, the positive half cycle descending branch of cycle is screened point and is arranged near the breakpoint of communication disruption close at the breakpoint of communication disruption, is filtered
Most of interference is gone, has made communication more accurate in the position of the negative half-wave of cycle；
At cycle zero passage, that is, screen point 0 and voltage zero-cross detection module is set, the defeated of point voltage comparator is screened in single-chip microcomputer scanning
Go out voltage, if timing time when recording its saltus step is in the range of allowable error, the cycle signal for detecting is true；
Lock in time is using the product multiplied to the stored count value N of grid cyclic wave and the average time T-phase of one cycle of power network, then adds
Clocking value Ts between upper timing time point ti and grid cyclic wave integer value obtains lock in time TZ, the mean time of its grid cyclic wave
Between be that the measured value of 100 grid cyclic wave times is taken into it in grid cyclic wave counting process to be averagely worth to；
System is communicated in the lock in time of agreement, and a communications electronics are respectively installed in the telecommunication circuit of each station control and main controller
Switch, switch drive module, the anti-phase rear square-wave signal of negative half-wave of grid cyclic wave are followed by believing electricity all when arriving through 0.5MS time delays
Sub switch, after connection within timing 9MS this cycle sign off, shut-off communications electronics switch waits the logical of next cycle
Letter, so goes round and begins again and realizes half wave communication, and main controller sends shut-off communications electronics and switchs to each station control during sign off
Instruction；
The signal source of bus distance travelled is the kilometer sensor on speed changer or hub for vehicle wheel, mileometer sensing
Device output signal through level shifting circuit, low-pass filter circuit it is anti-interference after send into microcontroller ports, the vehicle-mounted control of bus
Mileage between device processed preset each station, with position in being travelled；When bus communicates with bus station, if setting when
Between in interval without bus arrival, when communicate with first bus for arriving at a station afterwards, transmission marking signal M, public transport in addition
The actual measurement mileage that arrives at a station that the Vehicle Controller of car will indicate M compares calculating and arrives at a station mileage error with setting mileage, take 5 times with
On the mileage error amount that arrives at a station, leave out by setting ratio number of times and be up to station error for several times, remaining is averaged as offset,
For correcting measurement mileage；The time interval of the setting need to ensure while the bus for arriving at a station all leaves, and make next to arrive
Bus of standing is stopped to station location；Its speed of some vehicles is exported with mileage signal using bus signals, then by its speed
Journey data transmission unit obtains speed, mileage；
Bus is respectively provided with radio-frequency communication module with bus station, realizes the wireless messages transmission between bus and bus station；Penetrate
Frequency communication module selects CC2530 modules, or from the Zigbee module of other single-chip microcomputers；Public transport car kilometer output signal is connected to
I/O mouthfuls of 8051 single-chip microcomputers in CC2530 modules, is stored in the flash memory in its chip, car after being directly read by 8051 single-chip microcomputers
The communication data of set controller is also stored in the flash memory of CC2530 chips；
Each bus station constitutes bus arrival information query system, each public transport station control according to the station bus circuit
Address cycle sends detection signal, realizes that information is exchanged with bus station after the Vehicle Controller response of the bus of parking of arriving at a station,
Arrived at a station simultaneously during to channel transmission answer signal with many buses of circuit, public transport station control will continuously receive several mistakes
Packet or the intensity listened to after channel signals superposition transfinite, and illustrate that present channel is interfered, and at this moment, each bus presses it
Apart from S between parking spot and site location, by bus travel direction, since 6 meters of site location is exceeded forward, automatically according to
Every 6 meters of range incrementation numberings backward to 18-60 meters of point leaving from station, fall into described Serial Number Range by S values to number, bus station
Controller retransmits detection signal to the bus disturbing line that arrives at a station according to the number order, to failed if producing disturb again
The bus of communication, reduce it is described do not repeat to number again every 6 meters of values of scope, repeat said process to not producing interference,
Its numbering fails to during the next stop；
Bus station communicates with bus and is also adopted by the different communication Channel cyclical setting of neighbor stations, and uplink is same with downgoing line
Name site communication channel staggers and uses, and prevents co-channel interference；Bus after reaching terminal it is automatic change communication channel and
Website order is set, and public transport station control will arrive at a station send display to show after information processing, be easy to passenger to check；
The main controller that public transport terminus is set is connected by coupled computer and Internet, and passenger is using hand
Machine APP logs in the data that the network port of the computer is obtained in the bus arrival information of supervising software Zhong Ge roads.
2. the bus station's display system using half wave communication and ZigBee according to claim 1, it is characterised in that include:
Master controller (1), public transport station control (3), the Vehicle Controller (4) of bus；Wherein Vehicle Controller (4) by
Zigbee radio-frequency communication modules and kilometer sensor are constituted, and Zigbee radio-frequency communication modules select CC2530 modules, bus
The mileage output signal of kilometer sensor is connected to I/O mouthfuls of 8051 microcontrollers in CC2530 modules, Vehicle Controller (4)
Transceiving data is stored in the flash memory of its CC2530 chip；
Master controller (1), public transport station control (3) by Zigbee radio-frequency modules, cycle discriminator circuit, communications electronics switch,
Switch drive module and LCD display are constituted, and wherein master controller (1) is connected to Internet by coupled computer
Net (2), Zigbee radio-frequency modules select CC2530 modules, and 8051 microcontrollers are additionally operable to control cycle examination in CC2530 modules
Circuit, communications electronics switch and switch drive module, the data of arriving at a station of each public bus network are stored in CC2530 chips in bus station
Flash memory in, LCD display includes 8051 micro-controls in LCD drive circuits and LCD display, LCD display and CC2530 modules
I/O mouthfuls of device processed is connected, and LCD display is used to show the information of arriving at a station of public bus network；
Cycle discriminator circuit is made up of input circuit, voltage zero-cross detection module and voltage comparator；Input circuit is used for electricity
Power net alternating voltage is converted to the input voltage of voltage comparator suitably stabilization by resistance and the partial pressure of diode；Voltage
Zero passage detection module d type flip flop, voltage comparator selects LM393, its reference voltage to use mu balanced circuit burning voltage ratio
Compared with the threshold voltage of device；Communications electronics switch uses reverse-blocking tetrode thyristor, and switch drive module includes input circuit and d type flip flop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710162556.4A CN106781612A (en) | 2017-03-18 | 2017-03-18 | Using half wave communication and bus station's display system of ZigBee |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710162556.4A CN106781612A (en) | 2017-03-18 | 2017-03-18 | Using half wave communication and bus station's display system of ZigBee |
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| CN106781612A true CN106781612A (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710162556.4A Pending CN106781612A (en) | 2017-03-18 | 2017-03-18 | Using half wave communication and bus station's display system of ZigBee |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007138A (en) * | 2018-06-10 | 2019-07-12 | 福州准点信息科技有限公司 | A kind of electric energy metered system of residential area |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110007138A (en) * | 2018-06-10 | 2019-07-12 | 福州准点信息科技有限公司 | A kind of electric energy metered system of residential area |
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