It does sound like you have a load problem. Can you reduce the load through
any mechanical means?

"Turning off" the motor is probably not a good solution- it'll lose all its
holding power at that point and
you'll likely be worse than you were.

Mike H.

On Tue, May 22, 2012 at 9:11 PM, yamanoor sairam <yamanoorsai@yahoo.com>wro=
te:

> Hello All,
>
> I had written to the list long time back regarding the drive of servo
> motor using a potentiometer and a PIC12F675. I was successful in doing
> driving the same. I got back to working on this project and I am happen t=
o
> face a new problem.
>
> When there is no load on the motor, it works perfect. When I load the
> motor, it keeps wobbling. I think the motor is not able to drive the load
> or there is a small slippage that is causing the problem. All I wanted to
> do was that the motor should rotate between 90 and 180 degrees when a
> switch is toggled.
>
> Should I just switch off the motor when it is near the desired position?
> It looks like the motor has reached 3 degrees and trying to correct the
> angle and slipping off to -3 degrees. It keeps repeating this cycle.
>
>  I am posting a snippet of the code:
>
>  if(GPIO & (1<<3))
>                    {
>                    if(servoVal>=3D(1499))
>                    {
>                     servoVal =3D servoVal-(quotient*10);
>                     }
>                    // do_servo();
>                     }
>                  else         if(!(GPIO & (1<<3)))
>                                 {
>                                 if(servoVal<=3D(2300))
>                                 {
>                                 servoVal =3D servoVal+(quotient*10);
>                                  }
>                                   //do_servo();
>                                 }
>
> Sai
>
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