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<div>Doug,</div><div>I am willing to help eat the pie ;-)</div><div>Hank</div><div><br></div>
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On Monday, July 30, 2018, 5:17:08 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div dir="ltr">Doug,<br clear="none">arduino is the big thing in hobby electronics. It's a tiny computer board<br clear="none">that is designed to interact with the environment. Ie. you might have various <br clear="none">sensors like pressure, motion, light, or a switch etc that send a signal into the <br clear="none">arduino & the arduino outputs some action depending on the program you<br clear="none">write & the outputs you add to it. It is used a lot in robotics. The programming <br clear="none">language is reasonably simple & designed for beginners & hobbyists. <br clear="none">My local electronics store has a couple of stands full of sensors etc for it. <br clear="none">There are a number of arduino boards, uno, mega, duo etc.<br clear="none">It is like the raspberry pi but not as powerful. There are other more powerful<br clear="none">boards than raspberry pi on the market.<br clear="none"> If you bought a pressure sensor with a 4-20ma or 0-5V output you could<br clear="none">wire it to the arduino board & calibrate that signal into a depth range that is<br clear="none">outputed to an led screen, and also sets off an alarm at a certain depth.<br clear="none">There are good on line courses on it on UDEMY. <br clear="none">I was going to buy a plc ( industrial computer) but are now going to do <br clear="none">everything with arduino, raspberry pi etc. <br clear="none">Jon, Cliff & others are a lot more competent than I am with this, so there<br clear="none">would be plenty of help if you wanted to go that route.<br clear="none">Alan<br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none">Sent from my iPad<br clear="none"><br clear="none">> On 31/07/2018, at 9:56 AM, Douglas Suhr via Personal_Submersibles <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">> <br clear="none">> Ah, I think that would be great (to oil compensate the gauge).<br clear="none">> <br clear="none">> It would be very cool to have a digital display that could be switched<br clear="none">> from fresh to salt water. And though you are correct that I am young<br clear="none">> Alan, I'm not too tech savvy. I've never even heard of Arduino before<br clear="none">> - is that like Raspberry pie? 'Cause I've heard of this pie computer<br clear="none">> and all I can think is, 'Yeah, I'll take a slice with some vanilla ice<br clear="none">> cream please.' :) ~ Doug<br clear="none">> <br clear="none">> On 7/30/18, Alan via Personal_Submersibles<br clear="none">> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">>> Doug,<br clear="none">>> I am not sure how Snoopy's pressure gauge is set up but<br clear="none">>> I know of at least one person that has a rubber solder sucker filled<br clear="none">>> with oil screwed ( or attached) to the outside of the gauge port.<br clear="none">>> The gauge then only sees oil not sea water.<br clear="none">>> Gauges with electronic displays & the ability to flick between metric,<br clear="none">>> imperial, psi, mpa etc are pretty cheap. I have a dwyer gauge ( somewhere).<br clear="none">>> Being a young person you may want to go down the route of buying<br clear="none">>> a gauge that you can attach to an arduino, then electronically display on a<br clear="none">>> <br clear="none">>> board as big as you like! With a bit of code at the push of a button you<br clear="none">>> could get it to display fresh or salt water depth.<br clear="none">>> Cheers Alan<br clear="none">>> <br clear="none">>> <br clear="none">>> <br clear="none">>> Sent from my iPad<br clear="none">>> <br clear="none">>>> On 31/07/2018, at 6:36 AM, Douglas Suhr via Personal_Submersibles<br clear="none">>>> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">>>> <br clear="none">>>> Ah, I think you're right Jon... because the gauge plate would not be<br clear="none">>>> pressured anyway, huh. Never thought of that.<br clear="none">>>> <br clear="none">>>> No there was no gasket or anything, so I guess any moisture in the<br clear="none">>>> viewing portion of the gauge would just come from moisture inside the<br clear="none">>>> hull of the sub.<br clear="none">>>> <br clear="none">>>> And thank you for the pressures... not a huge difference but I suppose<br clear="none">>>> at deep depths it could work out to be somewhat of an error.<br clear="none">>>> <br clear="none">>>> I wonder how Alec printed such a nice looking label(?). ~ Doug<br clear="none">>>> <br clear="none">>>> On 7/30/18, Jon Wallace via Personal_Submersibles<br clear="none">>>> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">>>>> Fresh water: .433psi per footSalt water: .445 psi per foot<br clear="none">>>>> If there was no gasket sealing the acrylic/glass cover and bezel then<br clear="none">>>>> it's<br clear="none">>>>> likely condensation caused the wrinkling of the label.<br clear="none">>>>> Jon<br clear="none">>>>> <br clear="none">>>>> From: Douglas Suhr via Personal_Submersibles<br clear="none">>>>> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">>>>> To: Personal Submersibles General Discussion<br clear="none">>>>> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">>>>> Sent: Monday, July 30, 2018 1:16 PM<br clear="none">>>>> Subject: [PSUBS-MAILIST] Mechanical Depth Gauges<br clear="none">>>>> <br clear="none">>>>> All, as you may've been aware, in late 2015 I purchased Snoopy (a<br clear="none">>>>> K-250) from Alec Smyth. Regrettably I have been quite neglectful of<br clear="none">>>>> performing much upkeep on the sub, save for keeping the batteries<br clear="none">>>>> topped off. My schedule is finally allowing me to spend some real time<br clear="none">>>>> working on the sub and getting to know the specifics of each system.<br clear="none">>>>> <br clear="none">>>>> As you can imagine, I've been bugging Alec with a question here and<br clear="none">>>>> there, but thought with this topic I should start a discussion here on<br clear="none">>>>> the list for the benefit of anyone else who might have questions /<br clear="none">>>>> curiosities about mechanical depth gauges.<br clear="none">>>>> <br clear="none">>>>> Snoopy's depth gauge is nice and large (about 5" in diameter) so it's<br clear="none">>>>> easy to read. Alec created a nice label for the gauge face which reads<br clear="none">>>>> from 0 to 300 (in feet) with the last fifty feet being marked in red<br clear="none">>>>> to indicate 'too deep.'<br clear="none">>>>> <br clear="none">>>>> Problem is, when I looked at the depth gauge the other day, I noticed<br clear="none">>>>> that the transparent cover plate on the gauge looked to be quite<br clear="none">>>>> opaque (to the point where I couldn't quite read the numbers or count<br clear="none">>>>> the hash marks). I assumed that there was some moisture trapped in the<br clear="none">>>>> gauge, causing the obscuration. I decided to remove the gauge from the<br clear="none">>>>> sub and open it up to let it dry out.<br clear="none">>>>> <br clear="none">>>>> After removing the gauge from the sub, I unscrewed three small screws<br clear="none">>>>> around the bezel and popped off the transparent cover plate. It was<br clear="none">>>>> only then that I realized the opaqueness was not caused by moisture<br clear="none">>>>> but a distortion in the clear plastic. The distortion (like super fine<br clear="none">>>>> scratches) appears to be on the outside of the cover, as though it was<br clear="none">>>>> cleaned by something that started to melt the plastic or was left out<br clear="none">>>>> in the sun too long. I don't think either of these explanations make<br clear="none">>>>> sense, but I'm puzzled as to what might have caused it. I might try to<br clear="none">>>>> buff / polish the plastic, or perhaps just replace it with glass.<br clear="none">>>>> <br clear="none">>>>> I think it's a good idea to stick a dive computer in viewing range of<br clear="none">>>>> a viewport for a depth reading, but I like the idea of having a<br clear="none">>>>> mechanical gauge in the sub as well. A couple of questions that come<br clear="none">>>>> to mind: what is the pressure variation between salt water and fresh<br clear="none">>>>> water? Also, although I didn't find moisture in the gauge, The label<br clear="none">>>>> on the face is wrinkled a bit as though it has seen moisture. Although<br clear="none">>>>> water should never actually reach the gauge, I can see how moisture<br clear="none">>>>> from the inlet tube could find its way up into the gauge body. Should<br clear="none">>>>> I be concerned about drying it out somehow after a dive (especially in<br clear="none">>>>> salt water)? If so, how should I go about it? ~ Doug S.<br clear="none">>>>> _______________________________________________<br clear="none">>>>> Personal_Submersibles mailing list<br clear="none">>>>> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">>>>> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><div class="yqt5200985329" id="yqtfd76776"><br clear="none">>>> _______________________________________________<br clear="none">>>> Personal_Submersibles mailing list<br clear="none">>>> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">>>> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">>> <br clear="none">>> <br clear="none">>> _______________________________________________<br clear="none">>> Personal_Submersibles mailing list<br clear="none">>> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">>> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">>> <br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">> <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div></div>
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