Re: Re: Andy Olney's Comments on PIC-Servo

The current partitioning is fine, with the encoder feedback on one board
and the drivers on a second boare, that allows the feedback board to be
used with different driver boards, stepper, servo, microstepper, or
whatever the group's fertile minds dream up.

I really like opto-isolators on the quadrature input lines. I'v lost too
much sleep noiseproofing such stuff.

At 10:26 PM 7/20/99 -0700, you wrote:

>From: Tom Kulaga <tkulaga@...>
>
>> From: "Dan Mauch" <dmauch@...>
>>
>>If someone will give me a schematic I will build it.
>>Dan
>
>I'll put it together as soon as I get a chance. I assume we'll be
>needing 4 DAC channels to handle the 4 encoder inputs? I guess this
>is best answered by the EMC guys.
>
>OK, so here's what I'm thinking:
>
>- 4 channels of encoder input
>- 4 DAC outputs
>- Fully buffered, and regulated DC supply for encoders
>- 8 bit ISA (would 16 bit be better?)
>- Would a counter-timer chip be useful?
>- Some digital TTL level I/O would be good, but how many channels?
>
>I really want to do this right the first time, so let's get some
>discussion going. If there's a need, we could even make this a 6
>axis board. I'd probably want to make that a 2 board solution (to
>keep us using 2-level PCB's, and keep it HSM repeatable). There's no
>unreasonable requests that can be made on this, but there is a limit
>on just how much you can put on a 2-level board, so we need to make
>sure we have the right gear on there.
>
>-Tom Kulaga
>
>
>
>
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