Moving Message Display-Microcontroller and Assembly Language-Project Presentation, Slides of Microcontrollers

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MOVING MESSAGE DISPLAY

TYPES OF DISPLAYS

 LCD (LIQUID CRYSTAL DISPLAY)

 SEVEN SEGMENT DISPLAY

 FOURTEEN SEGMENT DISPLAY

 DOT MATRIX DISPLAY

AND MANY OTHERS

INTELLIGENT AND DUMB DISPLAYS

SIEMENS DL

Alphanumeric Intelligent Display

WHY WE USED DOT MATRIX

DISPLAY

 CAN DISPLAY A HUGE RANGE OF CHARACTERS

 MANY DOT MATRICES CAN BE INTEGRATED TOGETHER TO MAKE A HUGE DISPLAY

 ECONOMICAL AS COMPARED TO HUGE LCD’S

 MANY DISPLAY DESIGNS CAN BE MADE

MODULE 1: MAIN MODULE

 IT INCLUDE  MICROCONTROLLER AT89C55WDM  SERIAL PORT  CONNECTIONS TO OTHER MODULES

MODULE 2: MULTIPLEXERS

 THE FUCTION OF THIS MODULE IS TO SELECT ONE LATCH AT A TIME

MODULE 3: LATCHES

 EACH LATCH IS CONNECTED TO ANODES OF ONE DOT MATRIX ONLY AND VICE VERCA. LATCHES PROVIDE DATA TO ANODES OF THE DOT MATRICES.

MODULE 4: DOT MATRICES

 IT CONSISTS OF DOT MATRICES. RESPECTIVE CATHODES OF AL THE DOT MATRICES ARE SHORTED. ANODES OF DOT MATRICES ARE CONNECTED TO THE LATCHES

MODULE 5: CURRENT AMPLIFIER

 THE CATHODES OF DOT MATRICES ARE CONNECTED TO DARLIGTON CURRENT AMPLIFIERS TO PROVIDE NECESSARY CURRENT TO GLOW ALL THE LED’S IN DOT MATRICES.

74 LS 138 MULTIPLEXER

74 LS 373 LATCH

INTERFACING CIRCUITRY PART(2)

THANKS FOR YOUR

PATIENCEANY QUESTIONS