J.C. BOSE UNIVERSITY OF SCIENCE AND TECHNOLOGY
PROJECT REPORT
ON
8*8 LED MATRIX DISPLAY
SUBMITTED BY:
RAHUL - 17001008044
SAHIL TULI - 17001008048
RAGHAV BANSAL - 17001008043
PULKIT BANGA – 1700100804
NAVDEEP -17001008033
TABLE OF CONTENTS:
•
•
•
•
•
Components Required
Component Description
LED Matrix
Working
Code
LED MATRIX
An LED matrix is a two dimensional array of LEDs that can be
used to display symbols, characters or even images. Based on
the orientation of the LEDs in the matrix, there can be two types
of LED matrices.They are Common Row Anode and Common
Row Cathode.
Components Required
•
•
•
•
64*5mm Red LED's
Perforated PCB
8*CL100
Female Berg Strip
LED Matrix
An 8 x 8 LED matrix display is used in this project to display the
information.
They can also be made of different dimensions like 5 x 7, 8 x 8,
16 x 16, 32 x 32 etc. Based on the arrangement of the LEDs in
the matrix, an LED matrix can be either common row anode or
common row cathode.
LED’s
5mm LED’s of maximum current drawn of 20 mA is used to to
make 8*8 matrix such row accumulate positive pin anode and
column collectively accumulate ground Cathode.
CL100
CL100 is a NPN BiPolar Junction Transistor having Absolute
Maximum Rating:-
Electrical Characteristics of CL100
WORKING
In matrix all cathode of led in a column is connected and all the
anode of led in a row is connected to form 8 column and 8 rows
inputs.all led are connected with the CL100 Transistor as a switch
to provide a active pull down .
In our coding side there is multiplexing of led rows to
implementing the persistence of vision by only glowing one row at
a time according to our data.
Coding Parts
• Main program
• Look Up Table
Main Program
It mainly initialize our Our Ports A,B of 8255 Programmable
Peripheral Interface all in output mode by initialize in 8255 Control
Word 88H
Then main program then initialize values from look up table to
particular port
ACKNOWLEDGEMENT
We would like to express our deepest appreciation to all those who
provided us the possibility to complete this report. A special
gratitude we give to our workshop teacher,MR. LALIT MOHAN
whose contribution in stimulating suggestions and
encouragement, helped us to coordinate my project especially in
writing this report.
Furthermore I would also like to acknowledge with much
appreciation the permission to use all required equipment and the
necessary materials to complete thiss project on 8*8 LED MATRIX
DISPLAY. A special thanks goes to our team members,who
coordinated really well throughout the making of project,to assemble
the parts and gave suggestion about the task. I have to appreciate the
guidance given by other supervisor as well as the panels especially in
our project presentation that has improved our presentation skills
thanks to their comment and advices.
CIRCUIT DIAGRAM:
Code for 8085
Main Program
Memory Address
2000H
2002H
2004H
2007H
2009H
200BH
200DH
200EH
2010H
2011H
2012H
2014H
2015H
2016H
2019H
201CH
Label
ABOVE:
UP:
Look Up Table for Y
Memory Address
2050H
2051H
2052H
2053H
2054H
2055H
2006H
2007H
Machine Code
81
01
42
02
24
04
18
08
Nmenonics
MVI A,88H
OUT 03H
LXI H,2050H
MVI E,08H
MVI A,00H
OUT 00H
MOV A,M
OUT 01H
INX H
MOV A,M
OUT 00H
INX H
DCR E
JNZ UP
JMP ABOVE
HLT
Machine code
3E 88
D3 03
21 50 20
1E 08
3E 00
D3 00
7E
D3 01
23
7E
D3 00
23
1D
C2 09 20
C3 04 20
76
2008H
2009H
200AH
200BH
200CH
200DH
200EH
200FH
18
10
18
20
18
40
18
80