Re: xmitter circuit question-- please please please help :-)

[Jon Q. <li...@te...>]

sorry.  maybe this helps.
i'm using fedora core 1 (yarrow) on an i386- kernel 2.4.2115.nptl
i had initially installed lirc 0.6.6 from packages and then installed 
0.7.0pre1 from CVS.


Jon Quiros wrote:

> Hi, I'm trying to get mythtv working but an issue with lirc has me 
> stumped.
>
> i need to get an ir transmitter working so i can change channels on my 
> Scientific Atlanta Explorer 2000 digital cable box but just can't!
>
> I'm using lircd 0.7.0pre1, upgraded via cvs from pkgs becasue of some 
> problem with my hauppaugegrey remote.
>
> the hauppauge remote works great (was using a serial packard bell one 
> before) with the lirc_i2c kernel module.
>
> i've been trying for the past few weeks to get a working serial port 
> transmitter working because i have digital cable.
>
> to this end, i've disabled the lirc_i2c module so that only the seiral 
> one is loaded (and it works when i plug the packard bell serial 
> receiver in)
>
> here's what i've done so far:
>
> i started with enrique vidal's circuit for the transmitter, soldered 
> everything together before testing.  duh.  i used 2 2200uF capacitors 
> in parallel at first because the other closest capacitor at Radio 
> Shack was a 4700uF one.  i was hoping the 2x2200 arrangement would 
> work but it didn't (or maybe something else didn't).
>
> i then tried the same circuit with a different ir emmitter led than 
> the RadioShack one i was using (from a sony cd player remote control) 
> and still no go.
>
> i'm pretty sure i was using the proper method for this:
>
> a)  got the remote codes for my digital cable box (SA2000) from 
> lirc.org/remotes and >>'d them to lirc.conf
> b)  started up the computer with no lirc modules, i have
> setserial /dev/ttyS1 uart none
> setserial /dev/ttyS0 uart none
> in my startup script
> c)  manually started up the lirc_serial module (which works fine when 
> i plug in the packard bell receiver)
> d)  started lircd
> e)  issued a "irsend SEND_ONCE SA2000 POWER" and nothing.  i played 
> around with this for a bit, with SEND_START.
>
> after this i decided to try something else.
>
> i plugged the packard bell receiver in the serial port, and used 
> irrecord to record some signal from my normal tv remote.  i then added 
> these instructions to the lircd.conf file, restarted the computer, 
> modprobe's lirc_serial, started up lircd, and tried irsend with the tv 
> codes holding the transmitter close to the tv.  nada.
>
> i did this testing with the tv thinking maybe there was some weird 
> frequency thing with the IR of my digital cable box.
> ==========
>
> then i decided to simplify. 
> i made the "simple transmitter circuit" on 
> "http://lirc.org/transmitters.html" with and without a 1k resistor and 
> nothing.  so if i can't even get THAT working i realized i was way 
> off.  please help.
>
> watching my voltmeter on the dtr and gnd lines of the serial port i 
> see ~10-11v, then when i do an irsend it drops about a volt real quick 
> and comes up again....  is this good news?
>
> please, help me get this thing working as i've spent so much time on 
> it and its nagging at me!
> any other testing methids i could use?
>
> TIA,
>
> Jon Quiros
>
>
>
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