Showing posts with label LCD Interfacing with 8051. Show all posts
voting software
program for single user electronic voting machine in assembly language:
org 00h
lcd equ p0
rs equ p1.0
rw equ p1.1
en equ p1.2
mov lcd,#38h
acall cmd
acall delay
mov lcd,#06h
acall cmd
acall delay
mov lcd,#01h
acall cmd
acall delay
mov lcd,#0ch
acall cmd
acall delay
mov lcd,#85h
acall cmd
nop
mov lcd,#'0'
acall disp
mov lcd,#86h
acall cmd
nop
mov lcd,#'0'
acall disp
nop ;jdsjdkd
setb p2.0
mov dptr,#300h
mov r0,dpl
mov r3,dph
mov r6,#00d
check: jb p2.0,check
inc r6
mov a,r6
mov b,#10
div ab
mov r5,b
cjne r5,#00,go ;gdhfjgk
mov dpl,r0
mov dph,r3 ;//////*********1st**********//////
mov a,r5
movc a,@a+dptr
mov lcd,#86h
acall cmd
mov lcd,#'0'
acall disp
mov lcd,#85h
acall cmd
mov lcd,a
acall disp
inc dptr
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
acall delay
mov r0,dpl
mov r3,dph
sjmp check
go: mov dptr,#200h
mov a,r5
movc a,@a+dptr
mov lcd,#86h
acall cmd
acall delay
acall delay
acall delay
acall delay
acall delay
mov lcd,a
acall disp
sjmp check
abc2: sjmp abc2
cmd: clr rs
clr rw
setb en
acall delay2
clr en
ret
delay2: mov r1,#0cch
here3: mov r2,#001h
here: djnz r2,here
djnz r1,here3
ret
disp: setb rs
clr rw
setb en
acall delay2
clr en
ret
delay: mov r4,#0f1h
abn2: mov r7,#0ffh
abn: djnz r7,abn
djnz r4,abn2
ret
org 200h
db '0123456789'
org 300h
db '123456789'
Single user electronic voting machine
It is a nice project and easy to implement. You are required to know about the LCD interfacing so that you can understand the concept behind voting machine easily. I have implemented this circuit on proteus and hardware both.
Hardware is also easy to implement. You just have to interface LCD and connect a momentry switch to a particular pin of microcontroller.
Working of voting machine: When we start the project it initializes to zero. as we press the switch, value is increased by one.
I have used a general purpose register of microcontroller and register is initializes to zero when it starts. It checks the status of switch regularly. when switch is pressed value of register is increased by one. As we know that LCD always display ASCII value. It is not able to display the hex or decimal value. To display the number as ASCII value, i have stored the ASCII value from 0 to 9 in program memory. So that we are able to pick the equivalent ASCII value according to the stored value.
