[mythtv-users] IR Transmitter

[Dan Morphis]

The main difference?  Have you looked at the schematic for that link?  
There are about 8 times as many components on that one.  Plus the fact 
that the uirt2 uses a pic.  While the uirt2 will  have much greater 
range, it will require much more effort to make it work.  If you want an 
ir transmitter w/ greater range, an easier option would be to build this 
circuit: http://www.lirc.org/improved_transmitter.html

Hope this helps!

-dan

Dex West wrote:

>So what is the difference between the design described
>by Dan and UIRT2?  UIRT2 seems much more complicated
>what does it get you?
>
>I'm was planning on build a transmitter based on the
>following design:
>http://users.skynet.be/sky50985/
>
>--- Clint Gilders <techservices at onlinehobbyist.com>
>wrote:
>  
>
>>Dan Morphis wrote:
>>    
>>
>>>To build the simple circuit, you'll need a few
>>>      
>>>
>>parts:
>>    
>>
>>>1 x 1N4148 diode
>>>1 x 3k ohm
>>>1 x IR LED (Can be scavanged from an old remote,
>>>      
>>>
>>or you can use LD 271)
>>    
>>
>>>1 x Soldier style db9 male
>>>
>>>Soldier a wire on to pin 4 of the db9 header. 
>>>      
>>>
>>Take the other end and 
>>    
>>
>>>soldier it to the anode (The end W/O the black
>>>      
>>>
>>line) on the diode.  Take 
>>    
>>
>>>the other end of the diode and soldier it to one
>>>      
>>>
>>end of the resister.  
>>    
>>
>>>Take the other end of the resister and soldier it
>>>      
>>>
>>to anode of the ir led 
>>    
>>
>>>(The side w/o the flat spot [someone please
>>>      
>>>
>>correct me if I have that 
>>    
>>
>>>backwards]).  Take the other end of the ir led and
>>>      
>>>
>>soldier it to pin 5 
>>    
>>
>>>of the db9 male connector.
>>>
>>>You should be looking at less than $5 in parts. 
>>>      
>>>
>>If you want a quick way 
>>    
>>
>>>to test the circuit, fire up the camcorder and
>>>      
>>>
>>look through the view 
>>    
>>
>>>finder while lirc is sending a signal.  A quick
>>>      
>>>
>>way to send the signal 
>>    
>>
>>>is: irsend SEND_START <REMOTE_NAME> 1
>>>
>>>Hope this helps.  Feel free to ask any questions
>>>      
>>>
>>you might have!
>>
>>Thank-you so much for the easy to follow
>>instructions.
>>
>>I yanked the IR LED and a coloured led out of a
>>broken remote my kids 
>>play with.  My wife brought me the wire, diode and
>>resistor from work. I 
>>removed the casing from a ps2 to serial mouse
>>adapter to get the db9 
>>plug.
>>
>>I then soldered it all up (I included the coloured
>>LED so I could see if 
>>a signal was being sent).   I use star choice in
>>Canada, and I was able 
>>to find an lircd.conf file for it's remote ( at 
>>http://lirc.sourceforge.net/remotes/motorola/IRC-442
>>).  I also 
>>installed change_channel_lirc.sh from the contrib
>>section of the myth 
>>source.  I re-compiled lirc to work with the new
>>transmitter, and 
>>rebooted.   Whiz! Bang! It Works!  `irsend
>>StarChoice405 300` tunes in 
>>the CBC.
>>
>>Oh yeah, I also had to add:
>>
>>`/bin/setserial /dev/ttyS0 uart none` to the
>>beginning of my lircd init 
>>script.
>>
>>Thanks again.
>>-- 
>>Clint Gilders <techservices at onlinehobbyist.com>
>>Director of Technology Services
>>OnlineHobbyist.com, Inc.
>>    
>>
>>>_______________________________________________
>>>      
>>>
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>>
>>    
>>
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