Now-a-days so many companies are going for digital based advertisements. Not only companies the shopping malls, Railway stations, Bus stands, Cricket and Football stadiums every where the advertisement is going to be digital. All these are going for rich media or animated advertisements rather than simple text based advertisements. And the advertisers wants that people can the advertisement over from a longer distance. The internet, news paper and television media based advertisements are confined to indoor, shorter distance and cover fewer audience. To make the advertisement to over larger number of people, the advertisers chosen the transportation system (like highways, buses, railway stations) and sport stadiums, etc.,
To provide the solution for the above discussed problem, LED based digital screen is the best way to show the text, animation or rich media advertisement over a longer distance than the basic CRT and LCD technologies. The image or video shown in the CRT and LCD TV’s are not visible to human eye, but by using high power LED technology it is possible to see the image or video even in the mid-day light also. Not only just for advertisement, the LED displays are more wanting where the information dissemination is needed over a long distance.
In this project, a simple monochrome LED display screen is designed by using 8051 microcontroller. The advantage of this project is that it implemented with less hardware to decrease the cost of the LED display screen. This simple monochrome LED display screen will show the monochrome picture and will play the animations.
The 5mm LED’s are used to construct the LED screen of 24x16 pixels in resolution. An 89S52 microcontroller is used to refresh the screen with 24 frames per sec to avoid the flicker. The 8051 programming is involved in refreshing the screen. The 8051 program developed by using Embedded C in microvision keil IDE. Power supply interfacing to microcontroller is seperate than used for the LED display. The microcontroller is also perform the job to collect the animation data from PC and stored it in EEPROM memory (24C32). A Zigbee module (Xbee-pro) is used for wireless data transfer between PC and the LED screen. The shift register (74LS164) is used in the LED display construction along with large current sinker (ULN2803).
Block Diagram for Wireless Based Monochrome LED Display Screen using 8051 microcontroller
|Block Diagram Wireless Based Monochrome LED Display Screen using 8051 microcontroller|