[mythtv-users] IR Tranmitter

Bert Van Kets mythtv-users at vankets.com
Sun Sep 27 05:16:04 UTC 2009


William wrote:
> Bert Van Kets wrote:
>> I need to build an IR transmitter to set the channels on my cable box
>> (Belgian Telenet Digibox). Anybody try the three component circuit on
>> http://www.lirc.org/transmitters.html or is it necessary to use the
>> higher power one further down the page.
>>
>> How can I find out what frequency I need to transmit? How do I set it?
>>
>>   
>
> The cheap one will usually work ok for one device. The output is
> pretty weak so you need to tape it right over the sensor. The high
> power one will allow you to control several devices from one emitter.
>
> To find the frequency. Find a lirc configuration for your device and
> look at the top of the file. The frequency is shown in the info there.
> But in actuality, it does not matter as long as you install the
> correct conf files for your device. The config tells lirc what freq to
> use.
>
> William

Thanks William.
I will need to control at least two devices, so I'll have to go with the
transistor amplified one. It struck me that the NPN transistor is not
specified. Anybody got any suggestions? I can convert a circuit to a PCB
and build it, but designing a circuit is beyond my skills.

If I have two identical devices with identical remotes, won't I need to
hook up two transmitters? How else will the computer be able to set the
channels in the devices independently.

Thanks

Bert



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