[mythtv-users] lirc serial transmitter with an SA2000

[Mark Dobossy]

Wayne-

I would suggest using the simple circuit (the one with just a resistor  
and a diode and IR ED).  I tried all those other "improved" circuits,  
but none of them worked.  For the resistor, I used a 4.7kohm, which  
allows me to ir blast about 6 inches, and will have very little load on  
your serial port.  (and just run wires to a IR ED, and tape it right  
against the IR receiver on your SA2000).

-Mark
On Dec 4, 2003, at 3:35 PM, Wayne Veilleux wrote:

> Hi all,
>
> I know this is not the lirc mailing-list but I thought maybe someone  
> had the same problem using the simple lirc serial transmitter from the
> http://www.lirc.org/ site.
>
> First, let me thanks all the developpers for that very useful MythTV  
> software. I use it since 0.7 with and old WinTV bt878 TV tuner and now  
> I bought a digital cable tuner (SA2000) to have a better resoltion and  
> to solve some "noise" problem on some analog cable channel.
>
> So, first I read the tutorial from Kent on that mailing list
>
> (http://www.gossamer-threads.com/perl/mailarc/gforum.cgi?post=67881; 
> search_string=lirc%20kent%40kmtdesigns.com; 
> guest=1708499&t=search_engine#67881)
>
> Everything seem to be fine, I mean compiling lirc from the cvs and use  
> it as a receiver to change channel on my internal WinTV tuner card.  
> But when I try to plug my home-made ir transmitter (the simple one  
> from http://www.lirc.org/) I don't see me diode transmitter flashing  
> neither anything on my SA2000 using a command like "irsend SEND_ONCE  
> SA2000 2" where I get back that:
>
> buffer: -BEGIN-
> buffer: -SEND_ONCE SA2000 2-
> buffer: -SUCCESS-
> buffer: -END-
>
> And, in /var/log/messages from the lircd daemon:
> Dec  2 17:13:57 faleo lircd 0.7.0pre1[32489]: accepted new client on  
> /dev/lircd
> Dec  2 17:13:57 faleo kernel: lirc_serial: Interrupt 4, port 03f8  
> obtained
> Dec  2 17:13:57 faleo kernel: lirc_serial: SET_SEND_CARRIER
> Dec  2 17:13:57 faleo kernel: lirc_serial: in init_timing_params,  
> freq=56000, duty_cycle=50, clk/jiffy=18677760, pulse=16676,  
> space=16677, conv_us_to_clocks=1867
> Dec  2 17:13:57 faleo kernel: lirc_serial: SET_SEND_DUTY_CYCLE
> Dec  2 17:13:57 faleo kernel: lirc_serial: in init_timing_params,  
> freq=56000, duty_cycle=50, clk/jiffy=18677760, pulse=16676,  
> space=16677, conv_us_to_clocks=1867
> Dec  2 17:13:57 faleo lircd 0.7.0pre1[32489]: removed client
> Dec  2 17:13:57 faleo kernel: lirc_serial: freed IRQ 4
>
> (btw, I also run mdk-9.1 and I uninstall all the lirc stuff including  
> the libs). When I bought the diode transmitter I ask for a LD271 and  
> they sold me  a NTE3017 from NTE which is called "Infrared Light  
> Emmitting Diode (LED)" with Peak Emmission Wavelenght = 950nm and a  
> Po=15mW.
>
> Do you have any clue and/or any suggestion where I should look at to  
> troubleshoot that problem ? Is there a way to know what is transmeting  
> on my serial /dev/ttyS0 port ?
>
> Thanks for any help.
> -- 
> ------------------ Linuxez-vous les uns les autres -------------------
> Wayne Veilleux ing.                        wayne.veilleux at sympatico.ca
> ----------------------------------------------------------------------
>
>
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