The objective of the project is to provide non-commercial and purely academic insight into microcontroller assembly programming. The over all goal of the project is to provide connectivity between a desktop computer, microcontroller and a HD44 compatible LCD.
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The end user will type the desired string on the desktop and the result can be displayed on the LCD, which is connected to the microcontroller on the circuit board. The end user also has access to attractive features to move the LCD display in a specified direction.
The LCD comes with a 14pin interface, which includes pins to receive power supply and ground as well. These 14pins have to be interfaced with microcontroller output ports to send instructions, which initialize the LCD in appropriate modes, and also to send data from the microcontroller is intended for display on the LCD output screen.
The microcontroller is interfaced with the desktop through a full-duplex serial port. The pins are utilized to send byte at a time. The byte sent from the desktop can consist of instructions for the LCD and the end user desired new string to be displayed on the LCD. The microcontroller is interfaced with the LCD with 11 pins. The pins are utilized to send byte at a time and three pins are utilized to set the instruction modes on the LCD. The details of their uses and the information they carry will be discussed in depth later on.
Functional Components of Moving Message Display MMD:
Main components used in the project are listed below:
• ATMEL 89C51 Microcontroller.
• HD44780 Liquid Crystal Display.
• Max 232 Serial Interface IC.
Block Diagram of the Functioning of the Moving message display:-
below is the block diagram of the moving messgae display using microcontroller.