Stepper Motor

8051 MICROCONTROLLER BASED EXPERIMENT (SIMPLE CONTROL APPLICATIONS)

STEPPER MOTOR

AIM:

            To write an assembly language program to run a stepper motor at different speed using 8051.

APPARATUS REQUIRED:

                                    8051 kit, power chord

ALGORITHM:

1.      Start the program.

2.      Move the address location to DPTR.

3.      Move the content of DPTR to A.

4.      PUSH the higher and lower byte address to DPH and DPL.

5.      Move immediate data to respective register.

6.      Give the delay signal to run the motor.

7.      Move the content of A TO dptr.

8.      POP the higher and lower byte address to DPH and DPL.

9.      Increment the DPTR.

10. End the program.

PROGRAM:    

ADDRESS	LABEL	OPCODE	MNEMONICS	OPERAND
4100	START	90,45,00	MOV	DPTR, #4500
4103		78,04	MOV	R0,#04
4105		E0	MOVX	A,@DPTR
4106		C0,83	PUSH	DPH
4108		C0,82	PUSH	DPL
410A		90,FF,C0	MOV	DPTR, #FFC0
410D		7A,01	MOV	R2, #04
410F		79,22	MOV	R1, #0FF
4111	DLY1	7B,FF	MOV	R3, #0FF
4113	DLY	DB,FF	DJNZ	R3,DLY
4115		D9,FC	DJNZ	R1,DLY1
4117		DA,FA	DJNZ	R2,DLY1
4119		F0	MOVX	@DPTR,A
411A		D0,82	POP	DPL
411C		D0,83	POP	DPH
411E		A3	INC	DPTR
411F		D8,E4	DJNZ	R0,J0
4121		80,DD	SJMP	START
4123			END
4500	09,05,06,0A

FORWARD DATA: 09, 05, 06,0A

REVERSE DATA: 0A, 06, 05, and 09.

FAST DATA: 0F, 0A, 01, 02.

RESULT:

            Thus the stepper motor is observed to be rotating in different speed.