CN102402930A

CN102402930A - Remote wireless LED (light-emitting diode) dot matrix screen display system based on GSM (global system for mobile communication)

Info

Publication number: CN102402930A
Application number: CN2011103725875A
Authority: CN
Inventors: 陈兴文; 李爽; 沈志刚; 刘燕
Original assignee: Dalian Nationalities University
Current assignee: Dalian Minzu University
Priority date: 2011-11-22
Filing date: 2011-11-22
Publication date: 2012-04-04

Abstract

The invention relates to a remote wireless LED (light-emitting diode) dot matrix screen display system based on GSM (global system for mobile communication), comprising a GSM wireless data module, an SCM control module, an LED dot matrix screen display module and an SD (secure digital) card module. The SCM control module is connected with the SD card module through an SPI (serial peripheral interface) and is also connected with the GSM wireless data module through a port protection circuit; the LED dot matrix screen display module is connected with a corresponding interface of the SCM control module; the GSM wireless data module is a TC35I module; and the port protection circuit adopts a 74F07 chip. The remote wireless LED dot matrix screen display system based on GSM can be used to help the user to rapidly and conveniently update the content of a dot matrix screen in real time in the form of the mobile phone short message and has the advantages of wireless transmission, low operating cost and update rapidness and convenience.

Description

A kind of based on GSM long distance wireless LED dot matrix screen display system

Technical field

The present invention relates to a kind of dot matrix screen display system.

Background technology

At present; LED dot matrix screen display system is used very extensive; The traveler guiding information that is shown to airport, harbour, station from security exchange, Financial Information shows; From Traffic Information to postal service, the service propaganda and the information of service fields such as telecommunications, market shopping center shows that LED dot matrix screen conveys a message to people timely.Along with improving constantly of manufacturing process; Manufacturing cost also descends year by year; The LED dot matrix shields has in modern times become the leading products in the FPD in the information society undoubtedly, yet, in present LED dot matrix screen display system, still exist some shortcomings and problem; Such as; Existing dot matrix screen display system need be changed dot matrix screen displaying contents through the PC host computer, even some display systems can only show literal or simple figure that some are fixing, and existing dot matrix screen exists, and wiring is complicated, limited, the more high many shortcomings of operating cost of transmission range.

Summary of the invention

The object of the invention has overcome above-mentioned said deficiency, provide a kind of help user real time, efficiently the form through SMS upgrade dot matrix screen content based on GSM long distance wireless LED dot matrix screen display system.

The technical solution adopted for the present invention to solve the technical problems is: a kind of based on GSM long distance wireless LED dot matrix screen display system; Comprise gsm wireless data module, single chip control module, LED dot matrix screen display module and SD card module; Single chip control module links to each other with the SD card module through the SPI mouth; Single chip control module links to each other with the gsm wireless data module through the port protection circuit; LED dot matrix panel module is connected the corresponding interface place of single chip control module, and the gsm wireless data module adopts TC35I, and said port protection circuit adopts the 74F07 chip.

Single chip control module is the kernel control chip of system; Main completion is shielded dot matrix and is shown, SD card character library is called and the control of gsm wireless data module transceive data; During operation, at first want content displayed to the gsm wireless data module through writing the SMS transmission, by the data message of single chip control module processing single chip reception by the user; And through calling the character library control dot matrix screen in the SD card module, the content that the user is sent shows on the dot matrix screen.

The present invention compared with prior art has following advantage: can help user real time, upgrade dot matrix screen content displayed through the form of SMS quickly; Has wireless transmission; Operating cost is low; Upgrade advantages such as quick, meet the development trend of current outdoor dot matrix screen, have extensive market prospects.

Description of drawingsFig. 1 is a workflow block diagram of the present invention.

Fig. 2 is the power circuit principle figure of gsm wireless data module.

Fig. 3 is the circuit theory diagrams of SIM module in the gsm wireless data module.

Fig. 4 is a gsm wireless data module interface level change-over circuit schematic diagram.

Fig. 5 is the circuit theory diagrams of SD card module.

Fig. 6 is a software flow pattern.

EmbodimentAs shown in Figure 1; Comprise gsm wireless data module, single chip control module, LED dot matrix screen display module and SD card module; Single chip control module links to each other with the SD card module through the SPI mouth, and single chip control module links to each other with the gsm wireless data module through the port protection circuit, and LED dot matrix panel module is connected the corresponding interface place of single chip control module; GSM teledata transceiver module adopts TC35I, and said port protection circuit adopts the 74F07 chip.

As shown in Figure 2; Gsm wireless data module TC35I is very strict to the requirement of power supply, and the operating voltage range of module is 3.3～4.8V, and recommendation is 4.2V; When being lower than 3.3V; The TC35I module will be shut down automatically, also need very big electric current just can start when module starts, otherwise the module cisco unity malfunction.Based on above-mentioned, power supply chip adopts LP3966-ADJ, and this chip can satisfy the requirement of big electric current, can reach the current peak of 3A, and can make output voltage that very big variation range arranged through regulating resistance R 13, and the electric power output voltage value is selected 4.2V.

As shown in Figure 3, the TC35I module adopts external SIM, and 24～29 is the SIM pin; Last CCRST, CCIO, CCCLK, CCVCC and the CCGND of SIM directly links to each other with the end of the same name of TC35I through the SIM deck, and whether the CCIN pin of ZIF Connection Block is used for detecting SIM and inserts, if connect correct; Then the CCIN pin is exported high level; Otherwise be low level, consider the problem of interference, connect two little electric capacity at CCRST and CCVCC usually and link to each other with ground.

As shown in Figure 4; The interface voltage of single chip control module is a Transistor-Transistor Logic level; And the data port voltage of TC35I is about 2.8V, therefore when single-chip microcomputer carries out serial communication with it, can not directly link to each other; Need add the port protection circuit, this partial circuit adopts the 74F07 chip to realize the conversion of port level.

As shown in Figure 5; Because the limitation of single chip control module interior storage space; Can't the content of whole HZK16 file all be stored; So utilize the SD card to store the Chinese character base file, so just can be through the read-write of single chip control module control SD card, the information that the gsm wireless data module is received is converted into Chinese character and is shown on the dot matrix screen.Single chip control module is connected with the SD card module through the SPI mouth, and SD card domestic os adopts the FAT32 form, so all data write are all operated the data that store in the SD card through the operating system mode.

System's main program flow chart is as shown in Figure 6, and initialization section is accomplished the initialization operation of single chip control module and SD card module, and accomplishes the startup to the gsm wireless data module, signs in to the GSM network, makes it to get into holding state.Through the AT instruction gsm wireless data module is carried out the initialization setting, make it and can receive and send SMS message, control center's (mobile phone) sending controling instruction is resolved content of short message through receiving the short message subfunction, accomplishes the change to screen content.

Claims

1. one kind based on GSM long distance wireless LED dot matrix screen display system; Comprise gsm wireless data module, single chip control module, LED dot matrix screen display module and SD card module; It is characterized in that: single chip control module links to each other with the SD card module through the SPI mouth; Single chip control module links to each other with the gsm wireless data module through the port protection circuit, and LED dot matrix panel module is connected the corresponding interface place of single chip control module.

2. according to claim 1 a kind of based on GSM long distance wireless LED dot matrix screen display system, it is characterized in that: the gsm wireless data module adopts TC35I.

3. according to claim 1 and 2 a kind of based on GSM long distance wireless LED dot matrix screen display system, it is characterized in that: said port protection circuit adopts the 74F07 chip.