AVR-Chat

Have you considered LED's?  If they would work in your
application, they'd be easier to prototype, respond
more quickly and probably less expensive.

Several times, I've thought about using a stepper as a
Tach indicator, but the LED's response speed is too
large an advantage.  An RC servo would be even slower.

The one big disadvantage LED's have is not being able
to be seen in strong light.

Jeff Engel
--- Bernd Felsche <bernie@innovative.iinet.net.au>
wrote:

> 
> I'm considering all sorts of low-power options for
> providing an
> analogue indication (moving needle or bar). Typical
> ammeters draw
> current and the quantity I want to indicate isn't
> directly available
> as a current... it's number-crunched. Scale will be
> semi-log.
> 
> At first, I looked at small stepper motors but
> they're simply
> over-kill.  During my search, I've stumbled across
> radio-control
> servos... which are quite popular in robotics and
> the driving
> technology is certainly well known in AVR circles.
> 
> The question is; has anybody used these servos for
> instrumentation?
> 
> The accuracy doesn't need to be high; it only needs
> to provide an
> at-a-glance feel for the operator. The indicator
> only needs to be
> "accurate" at one point, which could be calibrated
> at "boot time".
> I expect the AVR controlling the servo to have a
> table of position
> vs value... with linear interpolation for points
> inbetween.
> 
> Any pointers to useful information such as
> steady-state current,
> holding torques, etc will be appreciated. I Googled
> but got around a
> million hits... or none.
> 
> -- 
> /"\ Bernd Felsche - Innovative Reckoning, Perth,
> Western Australia
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=====
Happiness is - positive intake manifold pressure.


		
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