Step motor control

[dragan77]

Thks man!
I make this, you mean across + an -,from power!
I see that many time in shema,why is that nessery?

Now I testing this code:

Delay VAR BYTE
i VAR WORD

TRISB = 0           ' All outputs.

Delay = 8           
pause 1000
For i = 1 to 512    '512 steps forward.
  PORTB =9
  Pause Delay
  PORTB =3
  Pause Delay
  PORTB =6
  Pause Delay
  PORTB =12
  Pause Delay
  
NEXT
pause 2500


For i = 1 to 256    '256 steps reverse.
  PORTB =12
  Pause Delay
  PORTB =6
  Pause Delay
  PORTB =3
  Pause Delay
  PORTB =9
  Pause Delay
NEXT
Pause 2500

For i = 1 to 256    '256 steps reverse.
  PORTB =12
  Pause Delay
  PORTB =6
  Pause Delay
  PORTB =3
  Pause Delay
  PORTB =9
  Pause Delay
NEXT
Pause 1500

For now, working 2 hour fine,is precison,and dont have some reset,we will se for now!

And one more question,is possible make some code for picbasic for this:

If step motor work some,go to left,go to right,.......
and I stop power,and turn again,is possible,motor back in some start position,(some zero posicion),and continue work same function,before stoping!