Re: OT -> bit twiddling on a parallel port?

This is different that putting a specific voltage out over a specific
pin though. You can use the parallel port to control the voltage of the
DAC, but you would need like 8 of these (assuming he wants to just
control the data pins) which were then each connected to the pins in a
parallel cable.

At least as I understand his question...

I guess the solution would depend on what exactly he needs to do. If he
just needs to be able to control one pin at a time, you could just have
the DAC which then goes to a rotary switch to go between the pins and
the output parallel cable. So the software would control the voltage,
but the switch would control which pin.. But I've been going on the
assumption he wants to be able control each pin simultaneously.

Justin

Jim Gribbin wrote:

>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.
>
>

---------
To unsubscribe, send email to <aklug-request@aklug.org>
with 'unsubscribe' in the message body.
Received on Wed Jul 20 00:19:55 2005