Try this way...
Psuedo Code:

Program ServoFollowsSwitch
Loop Top
If Switch =3D 1
then Pulse :=3D 1ms  //drive to 1ms position
else Pulse :=3D 2ms;  //drive to 2ms position
Delay 20ms     // cycle delay
Go to Loop Top

On 2/9/2012 9:35 PM, yamanoor sairam wrote:
> Hello All,
>
> I am trying to control a servo motor using a PIC12F675 with a toggle swit=
ch. When the switch is one state, the servo goes forward and the other stat=
e, the motor goes reverse.=20
>
> Here is something that I tried:
>
> _CONFIG(WDTDIS&PWRTEN&MCLRDIS&BOREN&UNPROTECT&INTCLK);
> #define_XTAL_FREQ4000000
>
> voidmain(void){
> TRISIO=3D(1<<3)|(1<<4);
> while(1){
> if(GPIO3)
> {
> GPIO=3D(1<<2);
> __delay_us(900);
>
>
> GPIO&=3D~(1<<2);
> __delay_us(100);
> __delay_ms(19); //here the total time pulse is 20 ms including ON time
>
>
>
> }
> if(GPIO4)
> {
> GPIO=3D(1<<2);
> __delay_us(2100);
>
>
> GPIO&=3D~(1<<2);
> __delay_us(900);
> __delay_ms(17);
>
> }
>
> }
> }
>
> My main need is that the servo should spin in opposite directions wheneve=
r the switch changes state. The motor changes position only once and nothin=
g happens after that.=20
>
> I am not able to find out what is wrong here. I also tried making the mot=
or move in opposite directions without any switch control. The servo does n=
ot spin as it should. It stays at the same position and makes some jerky mo=
vements.
>
> I am looking forward to your suggestion regarding the same.
>
> Sai

--=20
John Ferrell W8CCW
Be thankful we're not getting all the
government we're paying for. - Will Rogers


--=20
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