I think I sort of understand what your doing...
Let me see if I've got this right. You basically have one IC, a
'74138', which has 8 output pins that control relays. You control
which of the 8 relays are on or off by sending an octal number to the
parallel port.
The things I'm still hazy on are how exactly you wire it into the
parallel port, and what you mean by a buffer between the 74138 and the
relay. Also, for controlling it, is it as simple as echo 3
/dev/lp0 ?
Thanks
-Nate
On Mon, 06 Dec 2004 00:48:06 +, travis eddy [EMAIL PROTECTED] wrote:
id have to find my little sheet, but basicly i used some '74138' ics and had
them connect to the D0-6 pins ( i think it was awhile ago i'd hvae to look
my digram) and then each out put from then 74138 ( each one has 3 in's and 8
outs) connected to a buffer ( depending on the 74138 some need an inverter)
and each buffer had a relay, so all you would do was right a script that
sent a number to the parrele port ( usally has to be run as root) and the
port lights up certian Dx;s for the number ie. 3 would turn on D0,D1 and
then the 74138 would take that in and fire it's 3rd out put. if you
think you somewhat under stand this i can make a howto or something ( i just
have to find my dirgram of how i did this i build my deal like 2 years
about, it just sits tucked in it's little corner )
-travis
From: nate s [EMAIL PROTECTED]
Reply-To: nate s [EMAIL PROTECTED],Discussion about
mythtv [EMAIL PROTECTED]
To: Discussion about mythtv [EMAIL PROTECTED]
Subject: Re: Dish channel changing Re: [mythtv-users] Feature
Suggestions(Tivo)
Date: Sat, 4 Dec 2004 11:21:42 -0800
I've been wondering how exactly something like that would be done for
some time. Not for the same reason; I was wondering if there might be
some way to control a device, such as a AV switchbox, that does not
have a remote, with relays, but I never really looked in to it. I'm
curious to know how you did it.
-Nate
On Sat, 04 Dec 2004 15:27:14 +, travis eddy [EMAIL PROTECTED]
wrote:
for my dish box i custom buildn't a deal and some software the deal
was
a parrelle port device that accepted numbers 0-9 and then would fire a
relay
(depnending on the number of course) and that relay had two 30 gaurge
wires
running to the remote.. it works well very well, and yes it is a bit
primitive, but it works! if you want to try that you can email me, its
simple to build and the software is really basic.
-travis
From: Steve Bower [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED], Discussion about mythtv
[EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Dish channel changing Re: [mythtv-users] Feature Suggestions
(Tivo)
Date: Fri, 3 Dec 2004 11:29:59 -0500
Kevin == Kevin Hulse [EMAIL PROTECTED] writes:
Kevin Also, the DishTV set top boxes have this nasty habit of
Kevin putting you in a deadend condition if you select the wrong
Kevin channel. This is a problem with Tivo since it neither detects
nor
Kevin routes around this problem. The Dish box is basically expecting
Kevin human interaction contrary to the automated responses from the
Kevin Tivo.
Kevin Tivo wants to spit out full channel numbers and the Dish
box
Kevin wants to only get chan-up or chan-down. The end result is a
bunch
Kevin of trashed recordings.
Kevin I was wondering if Myth has any crash detection or any
Kevin other methods to route around this sort of problem?
Kevin For the Dish boxes, I suppose adding a chan-up command as a
Kevin prefix to any explicit channel input would suffice as a
Kevin workaround.
Hi Kevin,
I did this for a while with my mythtv/dish setup, but it ran into the
same issue when the chan-up put me onto a PPV channel...
I've been focusing my efforts more on hdtv lately, so I haven't been
fiddling with it much recently.
Can you access the guide from those screens? If so, that might be a
works everywhere thing.
Or, we could always grab a still picture of the channel-change banner
and OCR it to see if it matches the channel we want to be on. Or
compare the picture with the bad channel screen?
Steve.
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