Re: ServoToGo

Alan wrote:

> From: "Alan" <alan@...>
>
> I just went through a Q&A on this subject with the guys at STG,
> so perhaps I can fill you in. Before I do this, however, I'd like
> to say that they really are quite helpful.
>
> The older version is functionally similar to the new one with one
> exception... it does not have a watchdog timer on it. This can be
> a nice thing when you consider that you are moving a moving cutter
> around your (probably) expensive machine. The other thing is that
> apparently the original version had a flakey index pulse, something
> that was solved with the addition of one or more caps (reflection
> problem?).

That is an important feature, and I don't know how you can hook one
up externally without wiring to internal nodes on the board.
How expensive is a timer chip, anyway! The watchdog sees that
the channel zero DAC is being updated regularly, and can cause
an E-stop, if not. External circuitry is required for that, but it only
needs digital I/O pins that are already provided.

Jon