Mac Mason wrote:
> So, I got an interesting question the other day. I know a guy who wants to
> programatically set the voltages on individual pins on a parallel port. (IE,
> have a command for "set pin 5 to 2 volts" or "set pin 7 to 1 volt".
> He wants to do this in windows, but I'm having no luck figuring this out on
> any platform...
>
> Ideas?
>
> --Mac
>
Parallel ports are either 0 or 5 volt digital only (binary zero or one).
What he needs is a digital to analog converter. They are relatively easy
to interface to a parallel port and can put out a fairly wide range of
voltages.
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