Re: Serial IR receiver problem

[nobody@xxxxxxxxxxxx (Dave Houston)]

Erk <mrman_man@xxxxxxx> wrote:

>> You can use your soundcard to see the IR signal but you'll need to attenuate
>> the signal since you're pulling the output up to DCD which I think is
>> 10-12V. For a 5V signal see...
>>
>>      http://davehouston.net/learn.htm
>>
>> There's free soundcard oscilloscope software at...
>>
>>      http://www.zelscope.com/
>>
>> I would not entirely rule out EMI. You may need both devices using the same
>> ground and power to see it.
>
>I modified the circuit and run the zelscope. The results shows very
>little or no difference in the signal when the skype thing is attached
>and not. Screenshots here: http://www.hjerten.com/erik/IR_signal.gif
>
>I guess that leaves me with trying another IR receiver or USB
>controler. I think I'll go with the USB UIRT.

Yep, seeing is believing. I think that rules out EMI leaving only things
like the Skype software is monopolizing CPU time, disabling interrupts or
interfering with WinLirc's use of the timer chip. I still suggest asking
about Skype on the USB-UIRT forum before parting with the cash.