literature review of led moving message display board

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Pls I need detailed literature review on moving message display of microprocessor PIC16F84

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literature review of led moving message display board

Moving LED Display is very active application of digital electronics. The application of this device can be found everywhere. From name plate display to train number display this display is used. The power consumption is 70% less than primitive display.

The main advantage of using this display is the information displaying on the display can easily be change by changing the program in microcontroller. And also animation is possible during displaying the massage. This is undoubtedly acceptable in the high society. There is another advantage of this device i.e. less cost-effective. The LED used in this device is RED LED having wavelength 660nm. Hence the displaying massage can be seen from very high distance.




The materials has been used in this device is very easily available in the market. So the raw material availability creates no problem during device manufacture.

Reason for Choosing this Project:

· Broad field for the application of Microcontroller
· Core Field Application
· Components availability in the market.
· Chance to work with High level Sub-routine In microcontroller program.
· The Device has less power Consumption.
Summary:
Moving LED display displays the information on the Display board written in any language moving from right to left in animated form. This Display consists of four Units.
· Power Supply Unit.
· Register Unit.
· Display Unit.
· Controller Unit.

Display accepts simple string through uart and implements scrolling of the text on LED Matrix display. You can connect microcontrollers directly to update the string or connect to PC to send string to scroll. It supports different scrolling speeds.

It even supports static display of text without scrolling.

Format for sending string is very simple and it can accept maximum of 255 characters of ASCII text. We have provided sample source code for testing with microcontroller as well as details on testing with PC terminal software.

Features

48x8(384 LEDs) 5mm dot size LEDs in Matrix format (8 LED height and 48 LED width)
Operates at 5V (800mA max current)
Can connect directly to microcontroller or PC through RS232/USB
Many Scrolling speed supported.
Static display of characters without scrolling is possible
Internal buffer for 255 characters display
Sample source code for microcontroller to quick start your application.
Pinouts
There are just three pins to use the display.

RX-IN = Receive Input :
Input serial data of 3-5V logic level, Usually connected to TXD pin of microcontrollers/PC/RS232.

Note: Do not connect this pin to direct PC serial port without MAX232. It will damage the display since direct PC serial port has +12V/-12V voltage level.
+5V = Power Input: Regulated 5V supply input. Current has to be capable of atleast 800mA.
GND = Ground level of power supply. Must be common ground with microcontroller.