Gene Heskett wrote: > With the eval board at $150, and I doubt it comes with the rotary coil set, > that raises the price of that toy quite a bit unless someone here wants to > see if they can squeeze it into say $50 for a run of 100 or so. > > With the accuracy claimed, I can see it will take some means to diddle coil > positions while the spindle is locked very accurately at 90 degree increments > in order to achieve the accuracy claimed over a full revolution. This > obviously is going to make the mechanical portion pretty expensive too. > The rotary coils are your resolver. Your resolver should be built at the factory so there is no need for diddling. > Then the question is, can emc2 interface, via a separate parport, the rather > copious amount of data this thing can produce on demand, and make use of it > at usable spindle speeds? That would appear to be easier on the software > than trying to use the quadrature signals since their rep rate can get well > into the megahertz range, pushing the interrupts right over the edge. Yes, you skip the absolute output and just use the A and B outputs that look just line an encoder. Don't try to interface something like this in software. Use a hardware encoder counter. You'd never use the quadrature signal to cause interrupts.
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