You need to introduce a variable for the delay for this, and slowly
increase/decrease it as needed and feed your control loop with that.

And because of this you need a higher resolution of delay than the
__delay_ms() function. I have suggested this only for testing purposes.

if(GPIO & (1<<3))
{
    inc =3D 1;
}
 else
{
    inc =3D -1;
 }

// add the increment here
towait +=3D inc;
// make sure you are limiting the value
if ( towait < 1000) towait =3D 1000;
if ( towait > 2000) towait =3D 2000;

 GPIO |=3D(1<<2);
 __delay_us(towait);
 GPIO &=3D~(1<<2);

Something like that... If you need even more resolution then you might need
to calculate with floats...

Tamas



On 10 February 2012 14:08, yamanoor sairam <yamanoorsai@yahoo.com> wrote:

> Hello All,
> I am controlling a servo motor using the PIC12F675. The servo rotates in
> opposite directions. I am controlling the servo as follows:
>
>
> if(GPIO & (1<<3))
> {
> GPIO |=3D(1<<2);
>  __delay_ms(1);
>  GPIO &=3D~(1<<2);
> }
>  else
> {
>  GPIO |=3D(1<<2);
>  __delay_ms(2);
>  GPIO &=3D~(1<<2);
>  }
>  __delay_ms(18);
> I would like to control the rate at which the servo reaches the opposite
> ends. I tried looking for articles related to speed control, I found it t=
o
> be too complicated to control the rate of sweep. I am looking for
> suggestions for the same. Increasing the delay  did not help me control t=
he
> speeds. I am planning to control the speed using a potentiometer. Any
> suggestions would be helpful.
>
> Sai
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>



--=20
int main() { char *a,*s,*q; printf(s=3D"int main() { char *a,*s,*q;
printf(s=3D%s%s%s, q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }",
q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.