[PSUBS-MAILIST] USB thru hull

Fri Dec 1 17:33:29 EST 2017

Hi Brian,
I know what you mean and I'm not sure what they use either for the wireless
pressure transmitter - but I gather it's something proprietary and
expensive. My experiments have been to try to make standard/cheap products
work - to avoid through hulls rather than underwater wiring.

Cheers,
Steve

On 2 Dec 2017 4:35 am, "Brian Cox via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

Steve,  Was just talking about that with a friend last night.  I know here
is wireless equipment made for scuba, like reading your buddies pressure
via wireless, not sure what they use.

Brian

--- personal_submersibles at psubs.org wrote:

From: Stephen Fordyce 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 19:37:49 +1100

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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