[TriEmbed] Raspberry Pi 2 rocks...

Fri Apr 3 15:30:57 CDT 2015

While mono and stereo standards did put ground on the sleeve, the TRRS is a
new type of cable that has never had a standard.

http://en.wikipedia.org/wiki/Phone_connector_%28audio%29#Mobile_phones

And another interesting description:

http://forums.androidcentral.com/samsung-galaxy-s3/189523-final-soultion-why-most-headsets-won-t-work.html

On Fri, Apr 3, 2015 at 3:57 PM, Carl Nobile <carl.nobile at gmail.com> wrote:

> In general this would seem to me to be a substandard design to combine
> both audio and video together on a single connector. I'm sure it was only
> done to save real estate on the board. If they keep the impedance low
> enough for both audio and video output stages on the board it should help
> mitigate crosstalk issues. But, the Raspberry Pi is what it is.
>
>
> On Fri, Apr 3, 2015 at 3:47 PM, Carl Nobile <carl.nobile at gmail.com> wrote:
>
>> Kyle,
>>
>> I'm betting there could be an issue with crosstalk between the video and
>> audio in the cabling which means you may need a cable that has two
>> independent sets of shielded wires. Two shielded for audio and one shielded
>> for video.
>>
>> Actually, yes I was giving this some thought and the reason they
>> separated it like this may be to cut down on crosstalk, though that would
>> be negated with the wrong type of cable as I mentioned above.
>>
>> Carl
>>
>>
>> On Fri, Apr 3, 2015 at 3:43 PM, Kyle Thorson <kthorson at pobox.com> wrote:
>>
>>> Is this new style any better than the original?  Using the ground to
>>> separate the video from the audio.  Just curious.
>>>
>>> Also, it seems that some camcorder plugs are also non-standard.  I have
>>> been reading about lots of people finding the the Yellow and Red leads
>>> swapped.
>>>
>>> Kyle
>>>
>>> On Fri, Apr 3, 2015 at 3:40 PM, Carl Nobile <carl.nobile at gmail.com>
>>> wrote:
>>>
>>>> Ah, Didn't see your second post, I bet it was Apple that decided to
>>>> break with tradition and others followed suit to be compatible.
>>>>
>>>> Here's another link that also shows the connections
>>>> http://computers.tutsplus.com/tutorials/the-raspberry-pi-b-explored-and-explained--cms-21821
>>>>
>>>> Actually there is a standard and it dates back to early telephone days,
>>>> but it's been broken which means the standard is no longer a standard any
>>>> more, bummer.
>>>>
>>>>
>>>>
>>>> On Fri, Apr 3, 2015 at 3:14 PM, Rodney Radford <ncgadgetry at gmail.com>
>>>> wrote:
>>>>
>>>>> Carl, please look at the link I provided - the sleeve is not always
>>>>> ground and is not for the Raspberry Pi 2 and several other devices listed
>>>>> on that link.
>>>>>
>>>>> There is no standard, unfortunately. ..
>>>>> On Apr 3, 2015 3:06 PM, "Carl Nobile" <carl.nobile at gmail.com> wrote:
>>>>>
>>>>>> Kyle,
>>>>>>
>>>>>> Off the cuff I would say any stereo cable would work. Like an
>>>>>> extension headphone cable. All audio connectors of this type have a at
>>>>>> least  a tip, rings and sleeve. The sleeve is always the ground and the
>>>>>> other would be left and right channels. In the case of an RPi the tip is
>>>>>> the microphone and the ring is video and the sleeve is the ground for both.
>>>>>>
>>>>>> Carl
>>>>>>
>>>>>>
>>>>>> On Fri, Apr 3, 2015 at 1:38 PM, Kyle Thorson <kthorson at pobox.com>
>>>>>> wrote:
>>>>>>
>>>>>>> I ran across that URL as well.  That is the best explanation I have
>>>>>>> come across. I verified that my cable has ground wired to the ring at the
>>>>>>> sleeve.  The RPi2 requires video to be wired at the sleeve and ground as
>>>>>>> the next ring.  I was hoping someone might know where to find a cable that
>>>>>>> is wired the correct way for the Pi.  Is the RPi2's layout a UK thing? I
>>>>>>> may just make my own cable, but I didn't want to mess with that if I could
>>>>>>> help it.
>>>>>>>
>>>>>>> Kyle
>>>>>>>
>>>>>>> On Fri, Apr 3, 2015 at 11:05 AM, Rodney Radford <
>>>>>>> ncgadgetry at gmail.com> wrote:
>>>>>>>
>>>>>>>> Kyle, this article describes the correct pinout for that cable:
>>>>>>>>
>>>>>>>>
>>>>>>>> http://www.raspberrypi-spy.co.uk/2014/07/raspberry-pi-model-b-3-5mm-audiovideo-jack/
>>>>>>>>
>>>>>>>> Not all 4-wire to RCA cables are wired the same way as there is no
>>>>>>>> standard for this cable.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Thu, Apr 2, 2015 at 3:30 PM, Kyle Thorson <kthorson at pobox.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> How any of you are playing with the Pi?  I just picked up a RPi2
>>>>>>>>> and need to find a working composite cable for it.  The one I have on hand
>>>>>>>>> isn't wired the same way as the RPi2.  I need to find a cable with a 3.5
>>>>>>>>> side in the configuration from the sleeve: video, ground, audio, audio.  I
>>>>>>>>> am pretty sure my cable has ground in the wrong place. I am going to check
>>>>>>>>> which ring is ground tonight. I was about to order a new cable, but no one
>>>>>>>>> lists their wiring diagrams.  Does anyone know of a particular brand of
>>>>>>>>> cable that works with the RPi2?
>>>>>>>>>
>>>>>>>>> Thanks!
>>>>>>>>>
>>>>>>>>> Kyle
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Thu, Apr 2, 2015 at 2:50 PM, Rodney Radford <
>>>>>>>>> ncgadgetry at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> This is an interesting review of the new Raspberry Pi 2.  I
>>>>>>>>>> really liked some of the quotes and comments that state that the Pi was
>>>>>>>>>> never meant to be a cheap way to have a general purpose computer. It was
>>>>>>>>>> initially designed as an educational system and is being heavily used as an
>>>>>>>>>> embedded system.  If you take into consideration it's market, it is still a
>>>>>>>>>> great product.
>>>>>>>>>>
>>>>>>>>>> There are other, faster, embedded systems - some at a reasonable
>>>>>>>>>> price point to the Pi, but when you compare the cost, features, ease of
>>>>>>>>>> use, and the long list of developed apps/tools/libraries for it, it is in a
>>>>>>>>>> class by itself.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> http://eengenious.com/raspberry-pi-2-the-reviews-are-in-this-beast-rocks/
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Triangle, NC Embedded Computing mailing list
>>>>>>>>>> TriEmbed at triembed.org
>>>>>>>>>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>>>>>>>>>> TriEmbed web site: http://TriEmbed.org
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Triangle, NC Embedded Computing mailing list
>>>>>>> TriEmbed at triembed.org
>>>>>>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>>>>>>> TriEmbed web site: http://TriEmbed.org
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>
>>>>>> -------------------------------------------------------------------------------
>>>>>> Carl J. Nobile (Software Engineer)
>>>>>> carl.nobile at gmail.com
>>>>>>
>>>>>> -------------------------------------------------------------------------------
>>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> -------------------------------------------------------------------------------
>>>> Carl J. Nobile (Software Engineer)
>>>> carl.nobile at gmail.com
>>>>
>>>> -------------------------------------------------------------------------------
>>>>
>>>
>>>
>>
>>
>> --
>>
>> -------------------------------------------------------------------------------
>> Carl J. Nobile (Software Engineer)
>> carl.nobile at gmail.com
>>
>> -------------------------------------------------------------------------------
>>
>
>
>
> --
>
> -------------------------------------------------------------------------------
> Carl J. Nobile (Software Engineer)
> carl.nobile at gmail.com
>
> -------------------------------------------------------------------------------
>
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