How to control the dc server motor with 8051?

[huiyen]

I had write the program for the dc servo motor. The program such as below.As a result the servo motor's shaft was rotate continuously. I want to ask if i want to stop the motor when the motor's shaft has move 90 angle degree. How can i control it by 8051?


CPU "8051.TBL"
INCL "8051.INC"
ORG 0000H

MOV TMOD,#00000001B

LOOP: SETB P1.0
CALL DELAY
CLR P1.0
CALL DELAY
JMP LOOP

DELAY: MOV TH0,#0FEH
MOV TL0,#31H
SETB TR0
JNB TF0,$
CLR TR0
CLR TF0
RET

 

[davidgrm]

what kind of feedback do you have from the motor?

 

[ashishamours]

@huiyen... u hv giving same delay to both ON n OFF times that means it hs 50% duty cycle... that delay is for ON time ... write seperat delay of 19ms sec for OFF time...
this will work with u!