Re: Parallel port device

Rogier Wolff (R.E.Wolff@BitWizard.nl)
Thu, 19 Aug 1999 15:33:44 +0200 (MEST)

Adrian Baugh wrote:
> Hi (I hope I remembered the anti-spam To: address correctly),
>
> I am building some hardware to allow my computer to control a mains
> appliance, and was planning to have the parallel port drive an opto-isolated
> relay. However, it occured to me that maybe it isn't possible to hold a bit
> on the parallel port high for an arbitrarily long time.

Wrong.

> If so I'd need to put some kind of bistable circuit into my
> hardware. Can anyone tell me whether this is the case or not?

No.

A long, long time ago I wrote a driver that would allow you to
control individual bits on the parport. You're welcome to port
it a reasonably recent kernel.

echo 1 > /dev/....

and the light goes on

echo 0 > ....

and the light goes off.

http://www.bitwizard.nl/freesw.html if I remember correctly. (Otherwise
follow the free software link from the homepage).

Roger. 

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
------ Microsoft SELLS you Windows, Linux GIVES you the whole house ------




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