AVR-Chat

Bernd, 

those servos draw quite a lot of current - especially while they move,
are we talking of some 200 mA or so - in that respect a classic ammeter
would be the better choice I guess. 

Cheers, Gert Mueller

-----------------------------------------------------------
Datentechnik Dr.Gert Mueller GmbH
Diezstraße 2a,   D-53113 Bonn
Tel: +49-228-217297 Fax +49-228-261387
EMail: info@stepwalk.de
Homepage: www.stepwalk.de


> 
> 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
> \ /  ASCII ribbon campaign | I'm a .signature virus!
>  X   against HTML mail     | Copy me into your ~/.signature
> / \  and postings          | to help me spread!
> 
> 
> 
> 
> ------------------------ Yahoo! Groups Sponsor 
> --------------------~--> 
> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
> Now with Pop-Up Blocker. Get it for free!
> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/dN_tlB/TM
> --------------------------------------------------------------
> ------~-> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
>