[PSUBS-MAILIST] SEMjr - DIY Electronic Project

Fri Nov 27 14:33:34 EST 2020

 River,
The only things left for SEMJR is to create step-by-step instructions for fabrication and loading of the software program.  I'm still waiting for some parts so I can build a production example and videotape the actual fabrication.  It will literally be something like "Take the 10uf capacitor and solder it into the location marked C1"..."Take the 22uf capacitor and solder it into the location marked C2", etc, etc, etc.
I did not have a problem ordering the Luminox LOX-2 O2 sensor that is targeted for this project.  I selected it because the specs were reasonable, it uses TTL Serial communication, it is factory calibrated, temp and pressure compensated, and it has a life of at least 5 years.  It's only weakness is that it is limited to 25% reading, however I rationalized that not only would a 25% reading be enough to indicate too much variation in O2 to justify surfacing, but that the Luminox could be used to calibrate a galvanic O2 sensor which could be used as a supplement for reading above 25%.  This then also satisfies those who want a bit of redundancy with O2 sensors.
Jon

    On Friday, November 27, 2020, 01:30:37 PM EST, River Dolfi via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Jon,That set-up looks ideal. Do you have a grocery-list of tasks that still need to be completed? I've been amassing a collection of oxygen analyzers and so far haven't found a unit that has been completely to my satisfaction.
Also, there appears to be a COVID related shortage of oxygen sensors happening right now.
Thanks,
-River J. Dolfi
412-997-2526rdolfi7 at gmail.com

On Fri, Nov 27, 2020 at 1:11 PM via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Send Personal_Submersibles mailing list submissions to
        personal_submersibles at psubs.org

To subscribe or unsubscribe via the World Wide Web, visit
        http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
or, via email, send a message with subject or body 'help' to
        personal_submersibles-request at psubs.org

You can reach the person managing the list at
        personal_submersibles-owner at psubs.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Personal_Submersibles digest..."

Today's Topics:

   1. Re: OTS comms headset. (Alan via Personal_Submersibles)
   2. SEMjr - DIY Electronic Project
      (Jon Wallace via Personal_Submersibles)
   3. Re: SEMjr - DIY Electronic Project
      (David Colombo via Personal_Submersibles)

----------------------------------------------------------------------

Message: 1
Date: Sat, 21 Nov 2020 23:02:49 +1300
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] OTS comms headset.
Message-ID: <8ED01650-1290-4878-85B5-F2AB7719ADC6 at yahoo.com>
Content-Type: text/plain; charset="us-ascii"

Jon,
Just clarifying my thinking....
The more potting compound you put around the transducer the more it's going
to impede the signal, so the logical approach would be to put less around the
Topside transducer that is not going deep & more around the diver unit.
Alan

> On 21/11/2020, at 10:23 PM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, if you are asking for an OTS rating, it's rated for the depth of it's intended purpose.  See link to document, below.  For the STX-101, that's 35 feet because the standard cable length is 35 feet long.  For the SSB-2010 it's 300 feet because that's about the limit for deep technical diving.  You can see from the chart that the transducer with 55 foot cable is rated for 55 feet, and the one with 100 foot cable is rated for 100 feet.  These ratings make sense from a marketing perspective but I have no concern that these are even close to actual failure depths.  For example, Cliff gave the R-300 a 400 foot unmanned depth test in Lake Tahoe with his OTS transducer attached.  Surface unit performance is going to be negatively affected by signal loss and potential electromagnetic reflections in the cable just like any transceiver/antenna system which is why you won't see a 1000 or 2000 foot cable option.  The transducer units appear to be solidly potted and I suspect their!
  failure depth is "deep".  Certainly, I think there's no issue with it installed on any K-boat.
> 
> https://www.oceantechnologysystems.com/wp-content/uploads/2019/08/OTS-Catalog52019-small.pdf
> 
> Jon
> 
> 
> On Friday, November 20, 2020, 11:17:35 PM EST, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Thanks Jon, 
> do you know the depth rating for the XTS-101transducer. If its designed as a top side module I am wondering whether the transducer is not as robust as the divers transducer. I have seen that you can purchase a 100ft extension cable for it, so it can at least go that depth. 
> Alan
> 
> On Saturday, November 21, 2020, 03:37:51 PM GMT+13, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Alan, don't know, but I will certainly look into it.  Sounds like it could be as simple as a junction box that accepts VHF and UWC inputs, and a toggle switch to select the appropriate radio.  Nyutco modified his headset to use two boom mics, one for VHF the other for UWC.  I don't remember how we switched between the two transceivers though.  Maybe someone else does.
> 
> The STX-101 will be easy to modify for off-the-shelf headsets.  It uses a separate banana-clip jack for headset and microphone so there should be no cutting of wires necessary.  The SSB-2010 is going to be more of a hassle because it will require cutting and splicing their stock wire adapter.
> 
> Jon
> 
> 
> On Friday, November 20, 2020, 01:07:14 PM EST, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Some great thoughts here. 
> Jon, are you going to incorporate topside 
> Communication through the headset in your design? Looking forward to seeing what you come up with! 
> I like the idea of the push button on the controls. 
> Alan
> 
> 
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20201121/1a4799fe/attachment-0001.html>

------------------------------

Message: 2
Date: Fri, 27 Nov 2020 17:49:56 +0000 (UTC)
From: Jon Wallace via Personal_Submersibles
        <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
        <personal_submersibles at psubs.org>
Subject: [PSUBS-MAILIST] SEMjr - DIY Electronic Project
Message-ID: <1234133898.2132017.1606499396296 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

I have created a new page at?http://www.psubs.org/community/projects/SEM1/??describing a DIY project called SEMJR for building an electronic Submarine Environment Monitor which includes O2, CO2, Barometer, Temperature, and Humidity which should be valuable for anyone looking to supplement or upgrade from analog to digital devices.
A Bill Of Materials for all elements of the project is also available on the web site.? Additionally, written instructions will be provided and an instructional video produced in the near future.
I've designed this project to be as simple as I possibly can given the sensor components and intended functionality.? While it is intended to be a "connect Part-A to Part-B" type of project, it will involve lots of soldering as well as some wiring of electronic parts.? Additionally, you will need to download and install various software tools on your local computer to load the microprocessor with the actual application program that interfaces with the sensors.? I suspect some community members may be more adapt at this than others and encourage builders to find others in our community who can load the software on the microprocessor for them if you have have any technical hesitancy in this area.??
If you incorporate all four sensors (you can include only the ones you need) this DIY project will cost you approximately $370 USD.? The largest part of that cost is the O2 and CO2 sensors which cost around $100 each.
Please read the project description file on the website for more detailed information.? I expect to release the SEMJR application software before the end of December 2020.? It is developed using the Arduino IDE and will be released under GNU GPL 3.0 licensing.
Jon
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20201127/98f998de/attachment-0001.html>

------------------------------

Message: 3
Date: Fri, 27 Nov 2020 10:10:05 -0800
From: David Colombo via Personal_Submersibles
        <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] SEMjr - DIY Electronic Project
Message-ID:
        <CAHHFyEE1vYrnm8QOtZ16=j_PHnLBn1SgV+JiQLi80m3rxdLvcw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Jon, great job! This will be a great resource. This will be my next project
for my VAST sub over the winter.
David

On Fri, Nov 27, 2020, 9:51 AM Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I have created a new page at http://www.psubs.org/community/projects/SEM1/  describing
> a DIY project called SEMJR for building an electronic Submarine Environment
> Monitor which includes O2, CO2, Barometer, Temperature, and Humidity which
> should be valuable for anyone looking to supplement or upgrade from analog
> to digital devices.
>
> A Bill Of Materials for all elements of the project is also available on
> the web site.  Additionally, written instructions will be provided and an
> instructional video produced in the near future.
>
> I've designed this project to be as simple as I possibly can given the
> sensor components and intended functionality.  While it is intended to be a
> "connect Part-A to Part-B" type of project, it will involve lots of
> soldering as well as some wiring of electronic parts.  Additionally, you
> will need to download and install various software tools on your local
> computer to load the microprocessor with the actual application program
> that interfaces with the sensors.  I suspect some community members may be
> more adapt at this than others and encourage builders to find others in our
> community who can load the software on the microprocessor for them if you
> have have any technical hesitancy in this area.
>
> If you incorporate all four sensors (you can include only the ones you
> need) this DIY project will cost you approximately $370 USD.  The largest
> part of that cost is the O2 and CO2 sensors which cost around $100 each.
>
> Please read the project description file on the website for more detailed
> information.  I expect to release the SEMJR application software before the
> end of December 2020.  It is developed using the Arduino IDE and will be
> released under GNU GPL 3.0 licensing.
>
> Jon
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20201127/9a432b2d/attachment.html>

------------------------------

Subject: Digest Footer

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles

------------------------------

End of Personal_Submersibles Digest, Vol 89, Issue 58
*****************************************************

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20201127/aaecc2a4/attachment-0001.html>