USING LED PAIR FOR COUNTING FROM 0000 TO 1111

USING LED PAIR FOR COUNTING FROM 0000 TO 1111

LED bar start blinking in a sequence from 0000 to 1111, step by step with some delay.

Steps:

First of all make your microcontroller active by connecting the crystal from pin number 18 and 19(see in figure 2) 
Set the reset button from pin 9 as shown in figure 3.
Make the controller in working order as show in figure 4, then connect an LED through resistor to pin of port 1.0

Write a program of LED bar start blinking in a sequence from 0000 to 1111, step by step with some delay. in assembly language.

Burn the assembly language program in microcontroller through universal programmer.

You can see th wave form on oscilloscope.

Circuit Diagram:

pic configuration of ATML 89S52

Attachment of crystall figure number 2

Reset button figure no.3

Working condition of microcontroller figure 4

LED connection

Assembly Language Program :

 

ORG 00H

MAIN :

MOV P1,#0FFH

CLR A

PROG:

CPL  A

MOV P1,A

CPL A

INC A

CALL DELAY

CJNE A,#10H,PROG

JMP MAIN

DELAY:MOV R3,#10

LOOP0:MOV R2,#100

LOOP1:MOV R1,#2

LOOP2:MOV R2,#230

LOOP3:DJNZ R0,LOOP3

DJNZ R1,LOOP2

DJNZ R2,LOOP1

DJNZ R3,LOOP0

RET

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