| With the rapid economic development and progress of society, the public release of information in public places require more intense, LED display appears exactly in tune with this situation, LED screen display technology and application design level has been rapid development become a considerable development potential of the industry. Traditional publishing is to rely on the LED display information to complete the PC, PC machine with strong editing functions for managing data, the user through a simple operation to update the display of data, but when there is an emergency notification need to publish, the user when there are not a computer, relying on traditional communication line LED display can not meet the needs of real-time release of information.For real-time, on-site release information, refer to the relevant article on design for small LED display design is proposed wireless data update system based on a GSM. The system transmits data and instructions by phone, as a publishing platform for information, updates and management information. By the GSM mobile phone with the microprocessor module is responsible for transmitting information via the GSM network. After extraction of work and coordination between the microprocessor control modules, the microprocessor receives data from the module matrix font of information, and then placed in the mapped region of memory chips, system time clock chip as a reference, LED drive circuit control Display scan display. This design eliminates the trouble of wiring, and simple operation, allowing users to send information anywhere and at any time, improve efficiency.To maintainability of the system, the system uses sub-module design ideas, respectively SMS module, transmission module, control module, the display module made specific analysis of the key technologies for the hardware gives specific solutions and design schematics in the software design flow chart is given in accordance with the functional requirements of each part of the system. After the completion of the overall system design but also on the various modules of the hardware and software testing, find and modify the system problems and finally realized the GSM-based wireless data update system design.The system uses low power MSP430F149 microcontroller, there is a very high price, have practical value, data transmission module using technology more mature SIM900 A module, stable and easy to maintain, scalable LED display with dot matrix module, according to the need cascading extended display module. The system is simple, low cost, easy to maintain, scalable, with high potential for development. |
