[mythtv-users] Re: Recording LED almost working.

[Eric Thelin]

Have you considered putting a capacitor in between the leads of the LED
to average out the signal?  That should reduce the flickering quite a
bit.  Not the complete solution but at least something to try.

Eric

On Thu, 10 Jun 2004, Garry wrote:

> This starts off on topic, but quickly wanders off, so appologies... :-)
>
> Through the magic of a soldering iron and some bits from Maplins, I've
> got a parallel port powered LED.
>
> Using a script to fuser the video device (found on this here mailing
> list, thankyou) I can tell when Myth is using the TV card.
>
> Using a simple C program off the web, I can sent 0/1 to my LED and turn
> it off/on, when it's connected to my desktop PC.
>
> However, when I plug my creation into the parallel port of my mythtv
> hosting Pundit, the weirdness begins....
>
> On the pundit, the LED (wired to data pin 0, physical pin 2) flickers
> and flashes in sync with the HDD led during the boot process. Then once
> booting has finished, the disk activity has finished, and we're at the
> main myth menu, the LED continues to flicker away to itself.
>
> Something seems to be spewing stuff to the parallel port.
>
> I've tried..
>
> Checking fuser /dev/lp0 .. nothing is using it, apparently.
> Changing the bios settings on the parallel port from normal/EPP/ECP.
> Changing the port address of the parallel port
> removing/reloading the lp, paraport and paraport_pc modules
> echo'ing character to the /dev/lp0 device. Whilst this makes the
> flashing dimmer (?huh) it still flashes and flickers
>
> Maybe it's a kernel thing? My desktop is on 2.6 and the pundit is on 2.4.
>
> Just throwing this out here in case someone has some other ideas?
>
> And, if it works, I can describe how to set up a working 'recording' LED :-)
>
> -Garry.
>
>
>