Re: [CAD_CAM_EDM_DRO] Re: Dedicated mb for PID

Doug Harrison wrote:

> For what I am trying to accomplish, a quadrature decoder, two U/D counters,
> an adder and a DAC could do everything. The comparator circuit in the G320
> would work fine. Just take the 8 bit output of the adder, run it through a
> software PID algorithm and update the DAC accordingly. Fifty lines of
> qbasic (or whatever) would run the thing. Not esoteric but at least a
> non-EE could make it work.
>
> Seems like this could be done for about $10 per axis plus the cost of the
> pcb card, which could be ISA or PCI.
>
> I am digitally challanged so this is beyond my ability. That is why I
> proposed using existing cards.

Qbasic? My servo amps have a velocity bandwidth of about 3 KHz,
higher than the EMC servo update rate in my system. I suspect that
you'd have trouble doing a decent PID algorithm at a reasonable
rate in software on a $10 micro.

Jon