AVR-Chat

On Thursday 16 December 2004 01:39, Jeffrey Engel wrote:

> --- 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.

> 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.

LED's are in use at the moment, but useless under nominal lighting
conditions. Bright daylight.

> 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.

You got it in one. 

-- 
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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