Hello All,

I guess this is my third mail on the same topic. I am trying to control a s=
ervo motor using PIC 12F675. I was successful in driving the servo as well =
as achieving the speed control for the servo. Thanks for the help from the =
members of this list.=A0

Now, my speed control is quite flaky. I tried tweaking my code here and the=
re but I have had no success so far.

My main objective is that the servo should spin 0 to 90 and back based on t=
he data from toggle switch. I achieved this goal. When I turn a potentiomet=
er, the speed at which the servo rotates should change. I achieved this too=
.. However, the servo is not rotating 90 degrees at all the time.=A0

It rotates 90 ish -120 degrees at high speeds and rotates only 30-45 degree=
s on low speeds (or some weird behavior is happening). I want my servo to r=
otate 90 degrees but just my speed should vary.

Can any one point me to the error in my code?=A0

All this code is inside a while loop.

GO_DONE=3D1;
while(GO_DONE);
V_in=3D(ADRESH<<8)|ADRESL;
quotient=3DV_in/200; // I am dividing this because I will have integers bet=
ween 1 to 5
if(quotient<=3D1)
{
quotient=3D1;
}
if(GPIO&(1<<3))
{
while(counter>1000)
{
 counter=3Dcounter-(20*quotient);
GPIO|=3D(1<<2);
 cnt_1=3Dcounter;
 while(cnt_1>0)
 {
__delay_us(1);
 cnt_1--;
}
GPIO&=3D~(1<<2);
__delay_ms(18);
}
cnt=3D1000;//reset of counter for reverse direction
}
elseif(!(GPIO&(1<<3)))
{
while(cnt<1500)
{
cnt=3Dcnt+(20*quotient);
GPIO|=3D(1<<2);
cnt_2=3Dcnt;
while(cnt_2>0)
{
__delay_us(1);
cnt_2--;
}
GPIO&=3D~(1<<2);
__delay_ms(18);
}
counter=3D1500;//reset of counter for forward direction
}
}


Any help is appreciated

Sai
}

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