AVR-Chat

On 3 Nov 2009, at 14:24, erikc wrote:

> I'm working one one right now.  I just got started playing with AVRs
> (professionally I work with Freescale parts)
>
> My personal goal is to create digital readouts for the little lathe
> and mill I have out in the garage.  I intend this to be a
> multiprocessor device, with a separte AT90S2313 doing the quadrature
> (the scales attached to the machine put out a 90 degree phase-shifted
> waveform) decoding and counting for each axis (2 for the lathe, 3 for
> the mill) and I haven't made up my mind what I'm going to use for a
> master display processor.  At first, I'm going to want to just have a
> basic display of position, but then, as I go along, I want to add
> really fancy features such as:  "Enter a center point, a diameter, a
> number of holes, and whether or not I'm making an arc or a circle.
> Then compute the locations for each hole in the arc or circle and
> adjust the display so I can manually center the workpiece for each
> hole before drilling".  Maybe some day perhaps go all the way to
> complete numerical control.
>
> If someone could share a nice quadrature decoding routine?

Try here:

http://www.barello.net/Papers/Motion_Control/index.htm

Towards the bottom.

Pete Harrison
www.micromouseonline.com