ubuntu-users Digest, Vol 18, Issue 131

[Tod Merley]

On 2/12/06, Tod Merley <todbot88 at gmail.com> wrote:
>
> The voltage change (yet to be designed - lots of flexibility here - for
> example we could make it +12vDC @ 300ohms <+12vDC at 300ohms> = high and
-12vDC
> @ 300ohms <+12vDC at 300ohms> = low  as in classic RS-232 or we could use a
> "pull up" resistor into a CMOS/TTL type device.
>


> Date: Mon, 13 Feb 2006 08:13:04 -0500
> From: Billy Pollifrone <billy at silverbaseball.com>
> Subject: Re: Voltage Change = Execute Script/Program
> To: Ubuntu Help and User Discussions <ubuntu-users at lists.ubuntu.com>
> Message-ID:
>        <6c889d120602130513s3b55d544k73587ed8510a07e3 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> If you are looking for seeing if a signal is high or low, you can use the
> parallel port for this with the parallel port library PARAPIN. There is a
> warning I must give that if you are not careful, you may end up breaking
> your motherboard's parallel port. If you are careful though, you can
> implement this will minimal cost.
>
> A safer approach is to use an external circuit that will deliver the
> readings to the PC via serial, usb or GPIB. There is, of course, a cost
> involved in this.


Hi Billy!

PARAPIN looks very promising.  Yes, I will look at the paralell port
standards and design my interface to properly use it.  Thanks for the good
word!  Minimul cost is good here.

GPIB drove me crazy the first time I used it (actually on some old HP9000
stuff).  Seemed very convoluted for what we were doing and even convoluted
for what anyone would want to do.  I am supprised that it is still arround.
Remembering the crazy paralell TTL level interface I find the picture at
http://www.ni.com/gpib/ , where there is GPIB on one end and USB on the
other just worth a laugh.  I am happy to see http://www.bb-elec.com/ expanding
into the realm of ethernet, wireless (internet capable), and USB hung
digital and analog devices.

Thanks for the help!

Tod
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