<p dir="ltr"><br>
On Feb 27, 2016 10:16 PM, "Gary Buhrmaster" <<a href="mailto:gary.buhrmaster@gmail.com">gary.buhrmaster@gmail.com</a>> wrote:<br>
><br>
> On Sun, Feb 28, 2016 at 2:23 AM, Will Dormann <<a href="mailto:wdormann@gmail.com">wdormann@gmail.com</a>> wrote:<br>
> ....<br>
> > I see now that my cable box has what appears to be a 3.5" jack called<br>
> > "IR Remote Input". Which I would assume the MythTV box can perhaps<br>
> > control w/o IR anywhere in the chain, right? i.e., serial to serial.<br>
><br>
> Well, "simulated" IR blaster to "simulated" IR receiver (with<br>
> no actual IR (except inside the IC) involved). You still need<br>
> a "blaster" which accepts a plug for the emitter itself, and then<br>
> plug the output into the IR in port. Sometimes you can use<br>
> a serial output port of your PC, and sometimes you want a<br>
> "real" blaster to meet the tolerances of the receiver (I had<br>
> used both an iguanaIR and the commandIR for my "blaster"<br>
> in a previous life).<br>
><br>
> > Or is the opto-isolator used because the IR Input port isn't designed to<br>
> > be electrically connected to another system, due to ground loops or<br>
> > whatnot?<br>
><br>
> Right, potential ground (loop) issues. While "usually" it<br>
> will work sharing ground, I am a bit on the paranoid side,<br>
> so designed a circuit which shared nothing. Many others<br>
> have done equivalent solutions (what I did is not special).<br>
><br>
> There are a lot of solutions out there (if you look around<br>
> for (old school) TiVo to DTA/STB direct connect cables<br>
> in the usual places).<br>
><br>
> > Either way, do you have any links to your contribution to the<br>
> > wiki?<br>
><br>
> For the lirc channel changer script, I submitted/used this:<br>
> <a href="https://www.mythtv.org/wiki/LircChannelChanger">https://www.mythtv.org/wiki/LircChannelChanger</a><br>
><br>
> For the opto-isolator, I documented this at:<br>
> <a href="https://github.com/garybuhrmaster/misc/tree/master/IR_Blaster_to_Comcast_DTA_direct_connect_cable">https://github.com/garybuhrmaster/misc/tree/master/IR_Blaster_to_Comcast_DTA_direct_connect_cable</a><br>
> (I did not add it to the mythtv wiki since I figured it was<br>
> too specialized).<br>
><br>
> In any case, as long as firewire works for you, I would<br>
> not touch it. Just keep the idea of alternatives in your<br>
> toolbox for future use.<br>
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<p dir="ltr">I've been using an IR blaster for three years not without a hiccup.<br>
</p>