[PSUBS-MAILIST] USB thru hull

Fri Dec 1 03:37:49 EST 2017

Hi Brian,
Could you use a wireless USB connection instead?  I'm not sure of the exact
product, but surely something exists with the functionality of a USB cable,
but with a wireless signal instead of the cable.

Various wireless signals will get through plastic, short hops through water
and sometimes even metal, which rather surprised me.  I've had
weak Bluetooth signals go through 6mm acrylic plus 1-2m
air, and through 3mm aluminium + 5mm water + 1m air.  You would have to
have the outside half of the wireless hardware pretty close to the hull
(maybe at a viewport? or at a port with a solid plastic plug) but then you
could run a wire from there to the camera and dispense with a penetrator
into the camera housing.  Might be  worth considering when weighed against
everything involved in a penetrator.

I also did a USB (2.0) potted (but unshielded) wired connection for my
pressure pot.  It was noisy enough that the very crappy webcam I installed
inside struggled to get the signal through properly.

Cheers,
Steve

On Fri, Dec 1, 2017 at 7:20 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Thanks Sean, Alan,  I've just been recently amazed how there are so many
> options now with usb and HDMI that it could be a good way to control stuff
> outside the sub , like panning the camera for instance .  But you could
> have a myriad of different controls as well.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.
> org>
> Subject: Re: [PSUBS-MAILIST] USB thru hull
> Date: Fri, 1 Dec 2017 19:28:22 +1300
>
> Brian,
> just another thought on this.
> G.L. ( now DNVGL) require that through hulls
> don't leak if the cables are chopped through or cut.
> So I can't see any other option than potting if you want to comply with
> that. If you wanted to go this route, perhaps a stepped adapter like this
>  https://www.titanfittings.com/product-p/ss-6404.htm
> would give you enough room to separate out the component wires & sheilds
> & allow you to pot them.  Have been doing a bit of potting lately & not
> always easy.
> Have some thoughts on how to go about potting if you need to hear them!
> Alan
> [image: image1.JPG]
>
>
> Sent from my iPad
>
> On 1/12/2017, at 3:59 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,     That was my thought and fear exactly !    I'm probably over
> thinking this as I usually do.  I will probably be wanting to do the same
> thing to an HDMI cable.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.
> org>
> Subject: Re: [PSUBS-MAILIST] USB thru hull
> Date: Fri, 1 Dec 2017 15:37:14 +1300
>
> Brian,
> can you find a cross sectional diagram of the wire you are talking about?
> Have attached one I found on line as an example. Looks a nightmare to pot.
> This item has a plastic jacket & could be put in a compression fitting,
> however I would do what Carsten & Emile have done & put a blue globe
> fitting on the inside of the hull as well as the outside.
> My only reservation about this is that depending on how the wires etc are
> arranged inside the jacket, it could compress unevenly. You could try &
> fill
> the area of the cable that is inside the compression fitting with expoxy by
> cutting into the jacket & shielding & squirting a low viscosity epoxy in
> there.
> Alan
>
> <image1.JPG>
>
>
> Sent from my iPad
>
> On 1/12/2017, at 2:28 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Sean,   I'm using and squeeze fitting now for a co-ax line that is good
> for 600 ft, but there is a plastic core in there that the squeeze fitting
> can press against,  with regular wire it seems like water might try to
> migrate through.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: "Sean T. Stevenson via Personal_Submersibles" <
> personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] USB thru hull
> Date: Thu, 30 Nov 2017 20:21:23 -0500
>
> No, I meant that the shield should be contiguous from start to end,
> regardless of how many connectors are in line.
>
> Sean
>
>
>
> Sent from ProtonMail mobile
>
>
>
> -------- Original Message --------
> On Nov 30, 2017, 18:18, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Sean,    So not necessary to have the wire shielded through the short thru
> hull area?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: "Sean T. Stevenson via Personal_Submersibles" <
> personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] USB thru hull
> Date: Thu, 30 Nov 2017 20:12:22 -0500
>
> Yup. +5V, data+, data-, and ground. Any 4 pin connector should work, but
> to avoid noise issues you'll probably want to use twisted pair shielded
> wire, carry the shield through the connector, and depending on the total
> length of the cable run, 28 to 20 AWG wire (0.81m to 5m length, according
> to USB 2.0 spec).
>
> Sean
>
>
>
> Sent from ProtonMail mobile
>
>
>
> -------- Original Message --------
> On Nov 30, 2017, 18:03, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi All,
>                Has any one ran usb cable thru the hull and out to a camera
> or other device?  I think it's just 4 wires.
>
> Brian
>
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