AVR-Chat

If you want low power how about a graphical LCD
display (mobile phone display for example) emulating a
needle or a moving bar? A Nokia 3310 LCD (for example)
would give you 48x84 pixels for not a lot of money.

ken

 --- 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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