Summary: LED dot matrix city bus electronic display street sign is a microcomputer-controlled electronic information display that contains all the information needed for modern city buses. The street sign adopts a new design method of computer content editing and infrared communication, and abandons the traditional wired communication method for editing, modifying and deleting display information by using a remote control keyboard. This paper introduces the function and use of LED dot matrix city bus electronic display street signs.
A street sign is an identification device that a city bus should be configured with. The road signs make the city bus have the characteristics of operating lines, which is convenient for the management of the operating units and easy for the citizens to identify. The text of the electronic road sign shows clear and eye-catching advantages, making the bus and the city more modern, so more and more city buses are beginning to be equipped with electronic display signs.
With the wide application of electronic technology and computer control technology in urban passenger cars, passenger cars display road signs have also experienced several generations of development patterns from lighting road signs, flip-type electronic module road signs, LED dot matrix electronic road signs, etc. From the fixed content to the multiple display modes of arbitrary content; the editing and modification of the display information is also developed from the remote keyboard wired communication mode to the use of a computer to edit the text, and then transmitted to the street card wireless communication mode through a dedicated infrared controller. .
The electronic display street sign adopts the widely used electronic screen display technology, which has the hardware and software facilities of display, control and power supply.
The display part is composed of the LED basic module adopting the building block method to form the electronic display screen; the control part is composed of the single chip microcomputer and the single chip application system, and is the technical core of the electronic display street sign; the power part realizes the conversion of the vehicle power supply and the above two working voltages.
The control part is pre-programmed, and the necessary programs and fonts are input to output control signals according to the agreed display content and display mode. This electronic street sign is an information-fixed electronic display street sign. In actual use, it is very inconvenient for a bus company to change its information display due to the needs of the operation industry. LED dot matrix city bus electronic display street signs are not the same, users can easily and quickly use the computer and infrared communication controller to change information.
1LED dot matrix city bus electronic display street sign composition and function L1 composition overview Its display and power supply hardware and software facilities and fixed electronic display street signs are similar, and its control part as the technical core of the product has been designed with strong functions, realized The transition from information fixed to holographic electronic display signs.
The high-performance single-chip microcomputer and the relatively good single-chip expansion system form a road card control single-chip application system. The single-chip microcomputer selects the 80C51 type of MCS51 series, and its internal resources are rich. In addition, the program memory, data memory, 丨/interface circuit and remote infrared receiving head are extended externally through the single-chip wide-distribution bus and serial expansion port of the single-chip microcomputer. The utility model constitutes a road card control single-chip application system with strong function, and satisfies the control function and requirements of the electronic display road sign of the holographic city bus.
LED dot matrix city bus electronic display street signs are mainly composed of LED dot matrix display, infrared receiver, infrared communication controller, communication port, computer and so on. Due to the use of computer editing content, the new design method of infrared communication, when using, first compile the content to be displayed on the computer, and then send it to the street sign through the special infrared communication controller, the road sign can automatically display the content edited by the user. The whole process is convenient and fast.
LED dot matrix city bus electronic display street sign classification function and requirements L21 classification LED street signs are divided into car interior and car exterior according to the use environment.
The screen of the LED street sign is divided into a single primary color display screen, a dual primary color display screen, and a three primary color (full color) display screen according to the display color; and the gray level display screen can be further divided into a melon 3 64, 12256 gray scale display screen.
LED street signs are divided into text LED street sign display screens according to display performance, and LEDæ–‡ LED street sign display screens.
According to the adopted LED single point diameter can be divided into OnmLED display screen; the outside LED street sign display screen can display the screen according to the pixel diameter used.
According to the rated DC operating voltage, there are 12V and 24V. The rated current is generally 3.5A for the front road sign and 1.5A for the rear road sign. The function of this electronic road sign has the characteristics of clear display, reliable, high brightness, diverse display, convenient input and transformation, etc. It is suitable for various installation methods and is a new generation of vehicle. Electronic display products.
Static maximum display number: 16 points X16 Chinese characters. Former road sign: Chinese characters 10 or 8 points X16 points English characters 20; After road signs: Chinese characters 7 or English characters 14; Middle road signs: Chinese characters 5 or English characters 10.
Urban vehicle display mode selection: text LED street sign display and Yiwen LED street sign display should have jump-in, left-shift, right-shift, roller blind, blinds, swallow, spit, scroll and other display modes.
Holographic function: Enter the display information of any content or multiple display modes on the finished street sign at any time.
Convenient information change: When a bus company changes its information display due to the needs of the operation industry, the computer can use the computer to clear the information displayed in the original road sign and re-edit it, and then the infrared communication controller sends it to the street sign for storage. Can be displayed at any time.
m requires LED street sign information input hardware configuration: compatible with 486DX or above computer, RS232 serial connection, ordinary infrared transmitter, ordinary communication line (maximum communication distance 100m).
LED street sign display software: LED street sign display with common platform software, Windows operating system and compatible Chinese and English language, with appropriate self-test procedures, dedicated software for LED display.
The machine video LED street sign has the function of displaying the text. The sinuous text display requires stability, clarity, and no interference; the gray level requirement is 64.
Need to meet the requirements of no obvious special highlights.
The points are not more than 0.3% and are discretely distributed.
The electric power supply is DC12V (fluctuation range 8 environmental adaptability: the working conditions of the computer data and conversion part should meet the requirements of CB9813: it can work under the room temperature condition of 10~35 °C. The LED street sign can show normal under the following environmental conditions. Work: ambient air temperature -20~+50C; ambient air humidity; storage environment: -40~+60C. The average fault-free working time of the unit is MTBF not less than 800h. The temperature rise of the metal part after reaching the heat balance is not More than 45K, the temperature rise of the insulation material does not exceed the 2LED dot matrix type city bus electronic display street sign usage method - the general use of LED dot matrix city bus electronic display street signs use DC12V or DC24V power supply.
When the user installs or replaces the street sign, he should pay attention to the rated working voltage and the vehicle's power supply. After power-on, the street sign displays the saved information. For vehicles that are parked, the electronic display street sign cannot be inactive for a long time, because the rechargeable battery in the screen can only keep the input information within one month, and the power supply should be turned on for 1 hour every 1 month to avoid the street sign. Information is lost. Always check whether the installation of the road sign is firm. Avoid loosening due to bumps and vibrations in the vehicle, and damage the internal microcomputer chip, circuit board and other hardware. Do not use hard objects to strike, and pay attention to avoid water ingress. The vehicle with the electronic display street sign should be parked in a warehouse without acid and alkali corrosive gas, no strong mechanical vibration, no strong magnetic field and no rain and snow erosion.
There is a tubular fuse connected in series on the power input line of the road sign. If it is damaged, it should be replaced with the same specifications. When repairing the body, repair the power plug of the street sign to avoid burning the chip inside the street sign. Due to the high technical content of the road sign, do not open the cover without authorization if you do not have certain professional knowledge.
Like other automotive electronics, LED city bus electronic display signs should be avoided to operate when the vehicle's electrical system is disconnected from the battery.
2.2 Basic operation steps and methods The basic operation steps and methods are as follows: connect the communication cable between the computer and the infrared communication controller; edit the content on the computer (see the software description for detailed operation); turn on the infrared communication controller power supply, and turn the infrared emission head Align the receiving head of the street sign; check if the street sign content has been updated; turn off the power of the infrared communication controller.
2.3 Software Installation and Operation Instructions 2.3.1 Software Installation Instructions Put the installation floppy disk (CD) into the drive, run the “SETUP†installation program, wait a moment, see 'Veicomtothe according to the system instructions, press “OK†to enter the installation program , display the theme: "Beginthe exit installation. After the installation is finished, open 'start'
"Program", you can see the program bar has GC "program, click "GC", that is, run the multimedia program" in the "image editing" program.
2. Li 2 software operation instructions system operation. After the system is installed, the first step is to set the system parameters correctly. The system parameters mainly include “communication port†selection and baud rate “setting, selection†system setting “menu,†communication port setting “submenu, ie enter serial port setting. After the user sets the parameters according to their own usage, press 'OK', the parameters will be saved. If the hardware status has not changed, the parameters do not need to be set later. The user mainly modifies the communication port, and the baud rate is generally set correctly before leaving the factory. It is not specified, and should not be modified.
Imagine content editing. The street sign content is composed of every object, so first edit the content to be displayed into "BMP".
For the file, select the 'image file' menu and click the "image preview" submenu to view the file file you have edited.
Pen "program, according to the size of the street sign, set the appropriate content window size, select 'brush'
In the “Properties†submenu of the icon menu, the “color selection†color appears. The competition and height are the same as the street sign display points, and then press OK. The same size as the display screen appears.
Edit the desired text and other content in the window. Be sure to set the window to write words or artifacts of other colors on the black background, edit one frame, and select the file "Save As".
Submenu, you are asked to enter a file name.
Select the directory where you installed the "GC" program as the file storage directory, and enter a file name. Note that you must select 16 color bits in the save type TT, and press "Save".
Follow the steps above to edit each piece of content you want to display.
After editing, you should group all the contents into a group of continuously displayed information. This group of information is called the script file ", select the 'script file' menu, there are 'new', open', 'edit' and pieces, click 'new' Sub-menu, the 'New Script' window appears. First enter a script file name in the 'Script Name' field, then in the drive selection bar, file path bar, select the storage directory of the edited object file, in the file The display bar will display all the BMP objects in this directory. Click on the object file to be displayed, and the color of the file will change to white on a blue background. Then select an image in the "Display Mode" column, and display the display mode on the street sign. There are 15 display modes to choose from. The “Display Time†column selects the dwell time of the object on the display, which is the dwell time on the screen after the icon appears to all appear in the specified way. After the parameters are set, click 'New', the selected display file name and the corresponding display mode, display time, file path and other parameters appear in the middle script file content display column.
Repeat the above steps to edit all the files you want to display. If you make a mistake in editing, you can delete the function to delete the error file. If you miss some files, use "Insert" to insert a piece of content in the middle. After editing all, press 'OK', that is, Save the script file to your computer, then press 'Back' to exit and return to the main menu.
A good script file to view the contents of the script file.
In the script file, after clicking the 'Edit' submenu, a window similar to the "New" function will appear. The difference is that there is an existing script file in the script file name field. After clicking the file, select a file to be modified. Script file, after clicking the file, the existing content in the file is displayed in the information bar of the script file. After editing the same as the editing method of the new function, press "OK" to save the file, and then press "Back" to return to the main menu. .
Script file, after clicking this function, the deleted script file will appear. The content display window will display the display content in the script file. After confirming that the script file is no longer needed, press “Delete†to delete the script file. After that, press "Back" to return to the main menu.
Information communication. After the script file is edited. It is necessary to send the content to the street sign display for display. Information communication "is the function of file communication. There are 2 submenus under the column "Script Send" and "Analog Display".
can. Click on the submenu and the "Script Send" window appears. First select the path and directory where the script file is stored, select a script file to be displayed, open the power of the infrared communication controller (check the power indicator light, confirm that the power is turned on), and align the infrared emitter to the receiver on the street sign display. Press the 'Send' button, the computer will automatically send the contents of the script file to the street sign. After the completion of the transmission, check whether the content of the street sign is the newly launched content. If there is any problem, check whether the infrared transmitting head and the receiving head on the street sign are Align, whether the power supply in the infrared communication controller is normal, and whether it is connected with the serial port of the computer. After confirming the error, send it again. After the transmission is completed, be sure to turn off the power of the infrared communication controller.
Display the analog street sign.
3 Actual loading status LED dot matrix city bus electronic display street sign was jointly developed by Changzhou Electronics Research Institute and Changzhou Changjiang Bus Group Electric Appliance Co., Ltd., and was first installed in Changzhou Iveco Bus Co., Ltd. in March 2003. The floor is used on the city bus, and the feedback from users has been good so far.
When the street sign is loaded, generally only the general display information is edited. Before the vehicle is put into the line operation, the user can change the display information according to the actual situation of the company and the operation line. After reading the LED dot matrix city bus electronic display street sign specification, it is generally possible to quickly grasp the editing, modification and input of the display information. Because it displays a variety of content and forms, it can introduce the name of the operation route, the language of the labor, and also set up commercial advertisements. It can adapt to various working conditions in actual use, so it is very popular among bus companies and passengers. .
In addition, after slightly improving the LED dot matrix city bus electronic display street sign, it can also carry out information transmission and synchronization with the vehicle computer station, and the passenger can hear the voice message from the station. Seeing the corresponding information from the information display, it is more widely used.
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