SYSTEM DESIGN USING MICROCONTROLLER OF SECURITY SYSTEMS COMBINATION LOCK

Here you learn how we can design a system using microcontroller of security systems combination lock.

PROCEDURE:

1. Read number of bytes in the password
2. Initialize the password
3. Initialize the Keyboard Display IC (8279) to get key and Display
4. Blank the display
5. Read the key from user
6. Compare with the initialized password
7. If it is not equal, Display ‘E’ to indicate Error.
8. Repeat the steps 6 and 7 to read next key
9. If entered password equal to initialized password, Display ‘O’ to indicate open.

PROGRAM:

MOV 51H,#
MOV 52H,#
MOV 53H,#
MOV 54H,#
MOV R1,#51
MOV R0,#50
MOV R3,#04
MOV R2,#08
MOV DPTR,#FFC2
MOV A,#00
MOVX @DPTR,A
MOV A,#CC
MOVX @DPTR,A
MOV A,#90
MOVX @DPTR,A
MOV A,#FF
MOV DPTR,#FFCO
LOOP: MOVX @DPTR,A
DJNZ R2,LOOP
AGAIN: MOV DPTR,#FFC2
WAIT: MOVX A,@DPTR
ANL A,#07
JZ WAIT
MOV A,#40
MOVX @DPTR,A
MOV DPTR,#FFCO
MOVX A,@DPTR
MOV @R0,A
MOV A,@R1
CJNE A,50H,NEQ
INC R1
DJNZ R3,AGAIN
MOV DPTR,#FFCO
MOV A,#OC
MOVX @DPTR,A
XX: SJMP XX
NEQ: MOV DPTR,#FFCO
MOV A,#68
MOVX @DPTR,A
YY: SJMP YY

PROGRAMMING 8051 USING KEIL SOFTWARE

Here you find process and programing of 8051 using keil software

PROCEDURE:

1. Click KeilRVision2 icon in the desktop
2. From Project Menu open New project
3. Select the target device as ATMEL 89C51
4. From File Menu open New File
5. Type the program in Text Editor
6. Save the file with extension “.asm”
7. In project window click the tree showing TARGET
8. A source group will open.
9. Right Click the Source group and click “Add files to Source group”
10. A new window will open. Select our file with extension “.asm”
11. Click Add.
12. Go to project window and right click Source group again
13. Click Build Target (F7).
14. Errors if any will be displayed.
15. From Debug menu, select START/STOP Debug option.
16. In project window the status of all the registers will be displayed.
17. Click Go from Debug Menu.
18. The results stored in registers will be displayed in Project window.
19. Stop the Debug process before closing the application.


PROGRAM:

ORG 4100
CLR C
MOV A,#05H
MOV B,#02H
DIV AB

ALP For INTERFACING STEPPER MOTOR WITH 8051

Hi Friend here i am written ALP For INTERFACING STEPPER MOTOR WITH 8051

THEORY:
 
A motor in which the rotor is able to assume only discrete stationary angular position is a stepper motor. The rotor motion occurs in a stepwise manner from one equilibrium position to next.

The motor under our consideration uses 2 – phase scheme of operation. In this scheme, any two adjacent stator windings are energized. The switching condition for the above said scheme is shown in Table.











ALGORITHM:

1. Store the look up table address in DPTR
2. Move the count value (04) to one of the register (R0)
3. Load the control word for motor rotation in accumulator
4. Push the address in DPTR into stack
5. Load FFC0 in to DPTR.
6. Call the delay program
7. Send the control word for motor rotation to the external device.
8. Pop up the values in stack and increment it.
9. Decrement the count in R0. If zero go to next step else proceed to step 3.
10. Perform steps 1 to 9 repeatedly.

PROGRAM:

ORG 4100
START: MOV DPTR,#4500H
MOV R0,#04
AGAIN: MOVX A,@DPTR
PUSH DPH
PUSH PDL
MOV DPTR,#FFC0H
MOV R2, 04H
MOV R1,#FFH
DLY1: MOV R3, #FFH
DLY: DJNZ R3,DLY
DJNZ R1,DLY1
DJNZ R2,DLY1
MOVX @DPTR,A
POP DPL
POP DPH
INC DPTR
DJNZ R0,AGAIN
SJMP START