Re: [Emc-users] scale/encoder

[Stuart S. <st...@gm...>]

On Fri, Oct 29, 2010 at 3:07 PM, Andy Pugh <an...@an...>wrote:

> On 29 October 2010 19:32, Peter C. Wallace <pc...@me...> wrote:
>
> > The 5I23 can work with the resolver interface card (7I49) but this would
> need
> > firmware modifications for DC exitation like your scale uses (sine and
> cosine
> > signals with no carrier)
>
> At that point you could strip down my Arduino code to remove the PWM
> generation, take off the no-longer required filter/amplifier and
> simply keep the analogue sampling and arctan calculation.
> Then it would simply measure 6 voltages (sin and cos for three
> channels), calculate "angle" and output the results as quadrature
> pulses. You could re-jig for 16-bit A to D too (I have it at 10 bits
> for speed).
>
> Even if Chris is right that there is no interpolation, at $20 an
> Arduino is a very simple way to measure 6 analogue voltages, threshold
> them, and pass it to digital.
>
> --
> atp
>
>
This sounds good - I will try it
thanks
Stuart

-- 
dos centavos