INTERFACE A 7-SEGMENT DISPLAY PAIR WITH PORT 0

INTERFACE A 7-SEGMENT DISPLAY PAIR WITH PORT 0

In this project we will show how to interface 7_segment display with port 0 of microcontroller.

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 interface 7_segment display with port 0 of microcontroller 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

connection of 7-segment display

If we want to connect more than one 7 segment

7 Segment Display

Assembly Language Program :

 

ORG 00H

MAIN:

MOV P2,#10H

MOV P0,#3FH

CALL DELAY

MOV P0,#3FH

CALL DELAY

MOV P0,#06H

CALL DELAY

MOV P0,#5BH

CALL DELAY

MOV P0,#4FH

CALL DELAY

MOV P0,#66H

CALL DELAY

MOV P0,#6DH

CALL DELAY

MOV P0,#7DH

CALL DELAY

MOV P0,#07H

CALL DELAY

MOV P0,#6FH

CALL DELAY

MOV P0,#77H

CALL DELAY

MOV P0,#7CH

CALL DELAY

MOV P0,#39H

CALL DELAY

MOV P0,#5EH

CALL DELAY

MOV P0,#79H

CALL DELAY

MOV P0,#71H

CALL DELAY

MOV P2,#20H ; NEXT 7-SEGMENT PAIR ON AND FIRST CLOSE

MOV P0,#3FH

CALL DELAY

MOV P0,#3FH

CALL DELAY

MOV P0,#06H

CALL DELAY

MOV P0,#5BH

CALL DELAY

MOV P0,#4FH

CALL DELAY

MOV P0,#66H

CALL DELAY

MOV P0,#6DH

CALL DELAY

MOV P0,#7DH

CALL DELAY

MOV P0,#07H

CALL DELAY

MOV P0,#6FH

CALL DELAY

MOV P0,#77H

CALL DELAY

MOV P0,#7CH

CALL DELAY

MOV P0,#39H

CALL DELAY

MOV P0,#5EH

CALL DELAY

MOV P0,#79H

CALL DELAY

MOV P0,#71H

CALL DELAY

JMP MAIN

DELAY:MOV R3,#10  ; DELAY IN DISPLAY OF 1 SECOND

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

  Note: This is a program of 2 & segment display, so we can write 3 r 4 display too.

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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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NULL MODEM WITH LOOP BACK HANDSHAKING

NULL MODEM WITH LOOP BACK HANDSHAKING

A null modem cable for you...try to understand its working...if not i will tell you..start coment

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TURNING ON AND OFF LED BY USING TIMER 0/1 AND MAKE THE USE OF DIFFERENT MODES OF TIMER

TURNING ON AND OFF LED BY USING TIMER 0/1 AND MAKE THE USE OF DIFFERENT MODES OF TIMER

In this practical we use timer 0 to create a square wave on P1.0 by connecting an LED through resistor also show the waveform on Oscilloscope.

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 ON and OFF LED by using timer 0/1 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

MOV P1,#0FFH

MAIN:MOV TMOD,#01H

MOV TH0,#00H

MOV TL0,#00H

SETB TR0

LOOP: JNB TF0,LOOP

CPL P1.0

CLR TR0

CLR TF0

JMP MAIN

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