AVR-Chat

On Mon, Nov 10, 2008 at 09:22:47AM -0500, David VanHorn wrote:
> 
> Assuming you mean a radio-control type servo:
> 
> You'll need to output pulses of the appropriate width, for each of the
> servos that you are controlling.
> You can probably find out the appropriate widths on google for the
> specific models (they do vary somewhat), but a 1mS pulse is a good
> starting point.

IIRC its 1.0 ms to 2.0 ms every 20 ms, with 1.5 ms being midstroke.
Thats what I saw last time I looked at the output of an R/C radio
receiver driving a common inexpensive servo. Didn't study any of the
then-new so-called PCM digital radios some of which require special
servos.

Driving one of these servos is easy using a timer and output compare.
Lots of ways to do it, using 1 timer, or 2, or PCM modes, or software,
or some combination of all. For perfect emulation of an R/C radio you
want a 20 ms period and the high output should be from 1.0 to 2.0 ms.

> The period between the pulses can be varied, shorter means more
> accurate control.

If so, thats new.

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.