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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Alan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I think Triton use a PLC, because I spied a switch labeled “PLC Off” on their control panel. Years ago I got a PLC, a touch screen, and all the associated sensors
together, and wrote the code for it. Cliff and I picked the same equipment and shared our code, and you may have seen his R-300 runs everything off a touch screen. It’s a very neat approach because you can let the PLC concentrate on background monitoring (e.g.
O2 levels, pressures) while letting the pilot concentrate on the driving. Personally, I’m headed in the opposite direction nowadays, designing my new boat to have minimal electronics for reliability and ease of maintenance. But I still have a box full of all
this hardware, and if anyone is interested in installing it on their sub they can have it for a tiny fraction of what it would cost new.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">A PLC is a sort of industrial computer, much simpler and more rugged than a PC. It has no hard drive to fail, and you won’t get the “blue screen of death” like
on a PC. The logic runs in a continuous loop, monitoring parameters and taking action when conditions you specify are met. For instance, for life support you can say if cabin pressure drops below X, then open a valve to inject O2. Later in the loop, a similar
clause would close the valve if cabin pressure rises above Y. The scrubber would remove CO2 continuously, and the PLC add O2 to keep the cabin pressure between X and Y. Other alarms would go off if tank pressures are getting too low, if max depth is exceeded,
etc. etc. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best,<o:p></o:p></span></p>
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Alec<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org]
<b>On Behalf Of </b>Alan James<br>
<b>Sent:</b> Tuesday, January 14, 2014 2:02 AM<br>
<b>To:</b> Personal Submersibles General Discussion<br>
<b>Subject:</b> Re: [PSUBS-MAILIST] Compass Choice<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">Hi Douglas,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">I'll do a bit of homework on this.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">I had a look at the Triton 3000 when it visited N.Z. & it was monitoring<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">just about everything off a computer. They were talking of moving to<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">smaller computers & maybe strapping them to their thighs, so that the screen<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">didn't impinge on their view. Other submersibles I've seen similarly monitor<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">a lot of functions off the computer.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">I like this little computer with a 4.8" screen.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black"><a href="http://www.dynamism.com/top-notebooks/viliv-s5-premium.shtml">http://www.dynamism.com/top-notebooks/viliv-s5-premium.shtml</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">It runs windows so would be compatable with the Ocean Server compass.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">Cheers, Alan<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">From:</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> Douglas Suhr <<a href="mailto:spiritofcalypso@gmail.com">spiritofcalypso@gmail.com</a>><br>
<b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
<br>
<b>Sent:</b> Tuesday, January 14, 2014 4:59 PM<br>
<b>Subject:</b> Re: [PSUBS-MAILIST] Compass Choice</span><span style="font-family:"Helvetica","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">Nice find Alan. I'm going to spend some time looking over that site. I have to admit though, I feel the same as you in terms of not wanting to run my
compass off a computer. To me, computers should be benefitted from but not relied upon unconditionally. ~ Douglas S. <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">On Mon, Jan 13, 2014 at 10:45 PM, Alan James <<a href="mailto:alanlindsayjames@yahoo.com" target="_blank">alanlindsayjames@yahoo.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">Hi Jon,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">I found this off the shelf unit for $250- (made in USA) It is designed for marine applications<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">& has yaw, pitch & roll which is a G.L. requirement. So it's looking attractive.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black"><a href="http://www.ocean-server.com/compass.html" target="_blank">http://www.ocean-server.com/compass.html</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">It looks like I would have to run it off a computer though, which I didn't want to do,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">but may be forced down this path. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Helvetica","sans-serif";color:black">Alan<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-family:"Arial","sans-serif";color:black">From:</span></b><span style="font-family:"Arial","sans-serif";color:black"> Jon Wallace <<a href="mailto:jonw@psubs.org" target="_blank">jonw@psubs.org</a>></span><span style="font-family:"Helvetica","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black"><br>
<b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>>
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-family:"Helvetica","sans-serif";color:black">Sent:</span></b><span style="font-family:"Helvetica","sans-serif";color:black"> Tuesday, January 14, 2014 2:09 PM<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black"><br>
<b>Subject:</b> Re: [PSUBS-MAILIST] Compass Choice<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black"><br>
A tilt-compensated electronic compass (three axis, plus three axis <br>
accelerometer) would work connected to a small microcontroller like the <br>
Arduino UNO. The HMC6352 was the standard but Honeywell stopped <br>
producing them. There are others however but probably more expensive. <br>
The display could be a nice four digit LED (under two inches).<br>
<br>
Jon<o:p></o:p></span></p>
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<br>
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