[Discuss] [possibly OT] Advanced LIRC circuit

[stephen hawkes]

Excellent point chris. I think the two last boards I bought had the com 
ports disabled by default but the parallel port enabled iirc (I guess 
some people still use parallel port printers).

Chris Mueller wrote:
> I'm not certain if this is the case with Asrock motherboards, but 
> newer PC's usually have a riser on the motherboard and 'dongle' that 
> fits in a free PCI plate. Because of this modular design, i'd imagine 
> that by default the com ports are disabled? I'd first double check 
> within the bios to see if the device is enabled. If your kernel does 
> recognize the com port correctly, you can always short out the TX/RX 
> pins, and write something to the device while simultaneously reading 
> the input buffer. That'd be a quick-and-dirty check to see if the COM 
> port isn't to blame. Or, just plug in an old serial mouse and cat out 
> the device ... watch the pretty characters ;) lastly, i'd check the 
> power as somebody else mentioned. It's most likely running a 5 volt 
> circuit (just guessing?), check to see if the RTS line (also assuming 
> you're using this for power) can provide a near stable voltage. You 
> wouldn't happen to have schematics?
>
> best of luck,
> -chris
>>>>
>>>>  I have been using the home brew lirc receiver circuit with my PI 
>>>> machine
>>>>  without any problem. I have upgraded my machine recently with AMD
>>>> semapron processor with Asrock mother-board. the mother-board has only
>>>> one COM port. The problem is my  receiver circuit is not working 
>>>> with the
>>>> new mother-board where it is working  perfectly with the 
>>>> mother-board of
>>>> PI. I am using the same HDD hence same 2.6.10  custom build kernel 
>>>> with
>>>> both mother-board & CPU. May be the new mother-board fails to  provide
>>>> the required voltage/current to the receiver circuit. Could any one 
>>>> know
>>>> any lirc receiver circuit which can work with this type of low
>>>> voltage/current com port ?
>>>>
>>>> I know about http://www.irblaster.info/receiver.html which works down
>>>> about 5.2V with about 15mA output from your serial port. But the site
>>>> does not provide any circuit ; only sell the ready made kit.
>>>>
>>>>  thanks in advanced.
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