AVR-Chat

Controlling R/C servos is incredibly easy using the AVR's 16 bit
timer.  I have a blurb on a web page if that's any use to you.

http://members.shaw.ca/climber/avrpwm.html

The high torque microservos tend to use the most current.  The 
"standard" servos often use the least when moving.  Many servos
have spots in their travel where they "buzz;" the arm oscillates
between two points and just suck the current.  Adjusting the pulse
width just a little will often force the servo to pick a spot and the
current draw will drop.  When setting up my model airplanes I try make
sure the neutral point and the extreme throws are not a "buzzing"
point to help add longevity to my receiver battery's charge.

Craig

At 01:04 PM 12/16/2004, Craig Limber wrote:



>Controlling R/C servos is incredibly easy using the AVR's 16 bit
>timer.  I have a blurb on a web page if that's any use to you.
>
>http://members.shaw.ca/climber/avrpwm.html

Ok, but in this case, you aren't using the servo's drive electronics with 
the standard 0.5-1.5mS pulse

I did the pulse version in my "getting started" code for the 8515, but it 
would be easy to port it to a M8 or anything else current...

Looks like all you need is a simple mini-servo with a disk 
attached to the rotary output. The Futaba web site lists a 
bunch of models and is a good source of servo info.

    http://www.futaba-rc.com/

Bruce

On Friday 17 December 2004 02:24, Bruce Parham wrote:
> Looks like all you need is a simple mini-servo with a disk
> attached to the rotary output. The Futaba web site lists a

That's the basic idea, except I'm thinking more in terms of a
"needle" instead of wheel so that the relative position on the scale
provides at-a-glance information.

> bunch of models and is a good source of servo info.
>
>     http://www.futaba-rc.com/

Thanks.

-- 
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
\ /  ASCII ribbon campaign | I'm a .signature virus!
 X   against HTML mail     | Copy me into your ~/.signature
/ \  and postings          | to help me spread!

On Friday 17 December 2004 02:22, Dave VanHorn wrote:
> At 01:04 PM 12/16/2004, Craig Limber wrote:
> >Controlling R/C servos is incredibly easy using the AVR's 16 bit
> >timer.  I have a blurb on a web page if that's any use to you.

> >http://members.shaw.ca/climber/avrpwm.html

> Ok, but in this case, you aren't using the servo's drive
> electronics with the standard 0.5-1.5mS pulse

> I did the pulse version in my "getting started" code for the 8515,
> but it would be easy to port it to a M8 or anything else
> current...

That was the bit that led me to believe that it was probably
feasible, given the right servo that doesn't suck power when idle.

-- 
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
\ /  ASCII ribbon campaign | I'm a .signature virus!
 X   against HTML mail     | Copy me into your ~/.signature
/ \  and postings          | to help me spread!