[TriEmbed] Raspberry Pi 2 rocks...

Fri Apr 3 16:07:37 CDT 2015

If I make up one of these cables I'll take an existing "nice looking" avi cable, lop off the red, white and yellow RCA plugs and connect those ends to the 3.5 plug with enough heat shrink to just ignore the  connector plastic cover ('cause the three shielded cables won't fit anyway). I think if the shields extend to near the ends it won't be too bad.
Pete

----- Reply message -----
From: "Carl Nobile" <carl.nobile at gmail.com>
To: "Kyle Thorson" <kthorson at pobox.com>
Cc: "TriEmbed Discussion" <triembed at triembed.org>
Subject: [TriEmbed] Raspberry Pi 2 rocks...
Date: Fri, Apr 3, 2015 3:57 PM

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/

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Carl J. Nobile (Software Engineer)
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Carl J. Nobile (Software Engineer)
carl.nobile at gmail.com
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-- 
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