Bus station's intelligent display board based on nRF905 and WIFI

Bus station's intelligent display board based on nRF905 and WIFI

  • CN 106,910,362 A
  • Filed: 03/18/2017
  • Published: 06/30/2017
  • Est. Priority Date: 03/18/2017
  • Status: Active Application
First Claim
Patent Images

1. based on nRF905 and WIFI bus station'"'"'s intelligent display board, it is characterized in that using bus by each station when get on or off the busPatronage is different, and residence time when arriving at a station is different, and waiting time is different during the crossroad controlled by traffic lights, travelingMiddle road conditions are different, and speed is different, and the skill difference that driver uses causes the public transport of simultaneously outbound same circuit or different circuitsCar gradually pulls open different distances and forms signaling pathway, is communicated using between bus in traveling, communicates information toFront bus station;

  • The signal source of bus distance travelled is the kilometer sensor on speed changer or hub for vehicle wheel, mileometer sensingDevice output signal through level shifting circuit, low-pass filter circuit it is anti-interference after send into microcontroller ports, the vehicle-mounted control of busMileage between device processed preset each station, with position in being travelled;

    It is vehicle-mounted when bus when bus communicates with bus stationWhen the error amount of mileage is between+8 meters and -5 meters between mileage subtracts the station of actual measurement two between two stations of controller calculating setting, representThe bus do not stopped above, the bus is to be stopped to station location, then the error amount is marked M, bus it is vehicle-mountedController will indicate each mileage error amount that arrives at a station of M, takes more than 5 times and leaves out maximum for several times by setting ratio number of times and arrives at a station mileageError amount, remaining is averaged as offset, and for correcting measurement mileage, the time interval of the setting need to ensure while arrivingThe bus stood all leaves, and next bus is stopped to station location;

    Use radio communication between bus and between bus and bus station, radio communication by radio-frequency module, microcontroller andNonvolatile storage is constituted, and microcontroller selects C8051F330 chips, radio-frequency module to select nRF905, microcontrollerC8051F330 is communicated by its SPI interface with nRF905, and public transport car kilometer output signal is connected to I/O mouthfuls of C8051F330, byC8051F330 is stored in nonvolatile storage after reading, and the communication data of Vehicle Controller is also stored in nonvolatile storageIn;

    Each bus station constitutes bus arrival information query system, each public transport station control according to the station bus circuitAddress 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 mistakesPacket or the intensity listened to after channel signals superposition transfinite, and illustrate that present channel is interfered, and at this moment, each bus presses itApart from S between parking spot and site location, by bus travel direction, since 6 meters of site location is exceeded forward, automatically according toEvery 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 stationController retransmits detection signal to the bus disturbing line that arrives at a station according to the number order, to failed if producing disturb againThe 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;

    When the Vehicle Controller of public transport station control and the bus of parking of arriving at a station communicates, exchange each circuit bus and include the stationThe information of arriving at a station of the bus stood with previous 4-6, its information of arriving at a station is produced by each public transport station control, and packet of arriving at a station contains public transportLine Address and its arrival time and current time that station address, each circuit bus finally arrive at a station, and by our station travel directionUsed as the time period, communication channel sends detection signal to the 0.2-0.6 of running time average value needed for the next stop between coming distribution stationTime, on the basis of the current clock time that the time period is provided by this public transport station control, the time period distributed whenBetween do not overlap, the specific holding time length of time period is close by the driving vehicle in previous time period by our station to the next stopDegree determines that the time period is short for density big taking, and then selects a bus by our station and the next stop as principal communication public transportCar distributes a time period, selects next principal communication bus in the end time slightly before the time period, by thisContinue down, public transport station control sends arrive at a station information and car communication table to principal communication bus, when car communication table provides presetBetween in interval by the Line Address of each circuit bus of our station to the next stop, the numbering of the bus, reach our station whenBetween and the time period, the preset time interval determines by average running time between station, after principal communication bus leaves our station, pressedReach each bus of the our station time from as far as nearly order to car communication table and send detection signal, its response content includes public transportWith a distance from the next stop, the Vehicle Controller of principal communication bus receives each bus answer signal to the numbering and bus of carAfterwards, the bus nearest from the next stop is selected to be sent to the information of arriving at a station and car communication table, the Vehicle Controller of the bus is receivedUpdated after to the information of arriving at a station and car communication table and arrived at a station information, and continued in the time period not as principal communication bus by relayThe time being finished communicates as stated above, and the time period terminates, and principal communication bus is to switch to from communication bus;

    Principal communication bus is dynamically distributes, and remaining uses the station of agreement as from communication bus between our station and the next stopBetween communication channel, from communication bus travelled between station in be in reception state, 40 meters to 80 meters from the next stop of each busSetpoint distance when, bus and bus sign off, prepare the communication with next bus station, the information of arriving at a station between the stationOnly record per the road last arrival time of bus, record content before leaving out, the interior communication channel is according to its communication overlayScope sets the different interior communication channels of neighbor stations, prevents co-channel interference;

    Public bus network terminus is set watch-dog and is connected by connected computer and Internet, is pacified in computerEquipped with monitoring software, passenger is that the network port for logging in the computer using mobile phone A PP obtains monitoring software Zhong Ge road public transportCar arrives at a station the data in information, serial ports Wi-Fi module pathway in controller between the bus station in being communicated using serial ports Wi-Fi modesBy device AP wireless access Internets, information of arriving at a station regularly is exchanged to watch-dog, system is set using every 2 to 4 bus stationsOther between controller between the bus station of the serial ports Wi-Fi communications, two setting bus stations between the bus station of controller are publicStation is handed over, by being communicated between bus and bus in traveling, information transmission of arriving at a station is completed, and carried out in public transport station controlArrive at a station information processing, make the information of arriving at a station more accurate;

    Serial ports Wi-Fi module is connected from RN171 by microprocessor of the UART interface directly between bus station in controller,Other Wi-Fi modules can be selected, as long as by RN-171 modules when RN-171 modules are connected with single-chip microcomputer in public transport station controlPower supply, and TX and RX pin be connected with single-chip microcomputer, wherein TX and RX connects for intersection;

    So by nRF905 radio-frequency modulesThe information of arriving at a station sent, wireless router is sent to by the serial ports Wi-Fi module in controller between bus station by the information of arriving at a stationAP is through Internet to server.

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