AVR-Chat

At 05:29 PM 1/24/2005, Zack Widup wrote:

>I thought of that but I never implemented it.  I do have a question about
>the servos, though.
>
>I was considering using one of them to rotate a small directional loop
>antenna.  From the servo spec sheet I located, it appeared that you have
>to continuously send the pulses to the servo in order to have it hold its
>position.  Is that correct? Or is there a way of making the servo hold
>its angular position if the pulses are stopped?

NOT correct. The servo stops trying to maintain it's position if the pulses 
stop.
So, if you send it to 90 degrees, and you keep pulsing it, then you'll find 
it about impossible to change.  If you stop the pulses, then you can rotate 
it by hand, but it will be difficult.

I think that might be what I want.  I want to use the servo to rotate the 
antenna to a certain position, turn off the pulses, make a measurement 
with a receiver, then rotate a small angle and repeat.

I need to turn off the pulses when making a measurement because the pulses 
generate noise that wipes out the receiver if they are continued. The 
receiver is operating in the 300 to 700 kHz (yes - kHz, not MHz) range.

Maybe I should just experiment!  I have a couple of those R/C servos in my 
junquebox.

Zack

On Mon, 24 Jan 2005, Dave VanHorn wrote:

> At 05:29 PM 1/24/2005, Zack Widup wrote:
> 
> >I thought of that but I never implemented it.  I do have a question about
> >the servos, though.
> >
> >I was considering using one of them to rotate a small directional loop
> >antenna.  From the servo spec sheet I located, it appeared that you have
> >to continuously send the pulses to the servo in order to have it hold its
> >position.  Is that correct? Or is there a way of making the servo hold
> >its angular position if the pulses are stopped?
> 
> NOT correct. The servo stops trying to maintain it's position if the pulses
> stop.
> So, if you send it to 90 degrees, and you keep pulsing it, then you'll find
> it about impossible to change.  If you stop the pulses, then you can rotate
> it by hand, but it will be difficult.
>