[PSUBS-MAILIST] DSV Aquatic update

Thu May 24 15:42:44 EDT 2018

The Airmar DST800 transduce unit is hard plastic and built like a tank.
There is a replaceable paddle wheel but no seals,.  Everything is potted.
I have had this transducer to 160 feet with no issues.  The units is
designed for boats  as such the low depth number. Next month I will be
diving the boat to 400 ft so will let you know if the transducer holds up.
The 230 depth rating I was mentioning has to do with the sounder
functionality. After the unmanned dive to 400 ft I plan on diving manned to
300 ft to set max operating depth of the boat.  I will be able to tell you
more after that dive as to what depth the unit stops sending the altitudes
signals.

Cliff

On Thu, May 24, 2018 at 12:53 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Cliff,
> just had a look at the Airmar link & it says depth rating 10 ft. ??
> How are you mounting it?
> I am intending using Canbus in my system.
> Am using raspberry pi, a plc & extracting data from my motor
> controllers with Arduino.
> Cheers Alan
>
>
> Sent from my iPad
>
> On 25/05/2018, at 4:33 AM, Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> I use an Airmar DST800  http://www.airmar.com/uploads/Brochures/dst800.pdf
> for altitude and speed on the R300. Cost about $230.  It also give water
> tempertarure.  It would be compatible with what you have done as it sends
> results via serical communciaiton using NMEA 0183 prototcal.  The unit
> sends a series of ASCII strings for depth, speed and temperature that you
> would have to capture and parse to use.  I do this in my PLC.  The only
> down side I see for your boat is the depth spec which is about 230 ft.  I
> have seen a number of sounders that use NMEA 0183 serial or NEMA 2000
> communication for sending altitude.
>
> Some how Jon, I don't think I would find you sitting on the bottom at
> night on a 45 degree pitch,  inebriated, and calling for a lift bag!   But
> I do agree we can find all kinds of good reasons to add new stuff to our
> boats!
>
> Cliff
>
> On Thu, May 24, 2018 at 10:55 AM, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Cliff,
>>
>> I will probably add altitude as soon as I can find a sensor that will
>> interact with the Raspberry.  Also not shown is air tank pressure which
>> will be added.
>>
>> I agree that not all data is as important as others.  Regarding the pitch
>> and roll, I agree with your assessment on that as well.  The pitch and roll
>> outputs are "free", calculated as part of the digital compass heading which
>> is tilt compensated, so I added them in even though they are not very
>> useful in this particular submarine application.  However, should I find
>> myself in a night dive, stranded on the bottom, with the rear ballast tank
>> blown off the stern, drunk, incoherent, and unable to ascertain spatial
>> awareness; the data will come in handy so I can inform surface support that
>> I am sitting on the bottom pitched up 45 degrees and need a lift bag
>> attached to the stern.  :)  See...we can justify anything.
>>
>>
>>
>> ------------------------------
>> *From:* Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Thursday, May 24, 2018 11:15 AM
>> *Subject:* Re: [PSUBS-MAILIST] DSV Aquatic update
>>
>> I see depth on your navigation HMI but not altitude.  Are you planning on
>> adding this sensor?  Having run my boat for several years, I find that all
>> data is not equally important.  What I find I check a lot are SOF of air
>> tanks, SOC of batteries, depth, altitude, O2 and CO2 levels, and compass
>> heading.  Other parameters I check less frequently.  Also you use an
>> aircraft roll, pitch and compass heading style indictor which looks very
>> nice.  Having said that, my experience is that K boats have a large spread
>> between CB and CG.  As such my guess is that your indicator will not show
>> much variation in pitch or roll under normal operating conditions but of
>> course your heading will be active.
>>
>> Keep updates coming.  I enjoyed video.  Would be nice to have voice over
>> as you walk through buttons and screens on HMI.
>>
>> Best Regards
>>
>> Cliff
>>
>>
>>
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>>
>>
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