<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2">Alan, Are you in the states ?</FONT><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2">Brian</FONT></DIV><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2"><BR></FONT><BR><SPAN style="font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-size: 10pt;">From: Alan via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] compass</SPAN><BR><SPAN style="font-size: 10pt;">Date: Thu, 1 Nov 2018 10:20:48 +1300</SPAN><BR><BR><DIV style="font-size: 10pt;"></DIV><DIV style="font-size: 10pt;">Jon,</DIV><DIV style="font-size: 10pt;">thanks for that. On holiday in Florida keys till December, that's pretty cool.</DIV><DIV style="font-size: 10pt;">I googled & found this item CMPS12 for US $29.90</DIV><DIV style="font-size: 10pt;"><A href="https://www.robotshop.com/en/tilt-compensated-magnetic-compass-cmps12.html">https://www.robotshop.com/en/tilt-compensated-magnetic-compass-cmps12.html</A></DIV><DIV style="font-size: 10pt;">documentation...</DIV><DIV style="font-size: 10pt;"><A href="https://www.robot-electronics.co.uk/files/cmps12.pdf">https://www.robot-electronics.co.uk/files/cmps12.pdf</A></DIV><DIV style="font-size: 10pt;">There are some good reviews on it. One from a guy that is using it on a rov.</DIV><DIV style="font-size: 10pt;">Any opinion on this? </DIV><DIV style="font-size: 10pt;">Hank will need to display the compass on a screen of some sort.</DIV><DIV style="font-size: 10pt;">If he is buying some sort of HMI to display it he may as well have his other </DIV><DIV style="font-size: 10pt;">sensors, battery voltage etc displayed on it! He is really on a slippery slope now.</DIV><DIV style="font-size: 10pt;">Alan</DIV><DIV style="font-size: 10pt;"><BR></DIV><DIV style="font-size: 10pt;"><BR>On 1/11/2018, at 4:00 AM, Jon Wallace via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE style="font-size: 10pt;"><DIV><DIV style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><DIV><SPAN></SPAN></DIV><DIV>Alan,</DIV><DIV><BR></DIV><DIV>For the most part, it's about accuracy. This device has been around for many years, it's true, but that's because the specs are very good. It also performs all the calculations spitting out compass heading, yaw, pitch, in a directly usable format as well as being tilt compensated up to 60 degrees (I think). It can be mounted in three different planes which isn't so important from a PSUBS perspective but could be critical in some applications. So for basic compass purposes it is definitely a Cadillac.</DIV><DIV><BR></DIV><DIV dir="ltr">There are many cheaper solid state compasses available but few are tilt-compensated and even a little bit of tilt has a major impact on the measurement output. The tilt-compensation on the HMC-6343 really works well and it was important to me to know that the output I am seeing is as accurate as possible despite any wave action on the surface, or small balance issues under water.</DIV><DIV><BR></DIV><DIV>Any IMU with 9 degrees of freedom can be used to accomplish the same thing but they all output raw data that needs to be calculated, twisted, torqued, torched, hacksawed, and then welded back together again. The HMC-6343 does that all internally and is simple to configure and program.</DIV><DIV><BR></DIV><DIV>The link I showed is a Canadian outlet so price is $188(CAD). USA suppliers have them for $159(US) although they go into short supply occasionally. Add on an arduino for $35 and a bit of time programming, and you have a nice accurate compass for less than $200(US).</DIV><DIV><BR></DIV><DIV dir="ltr">I have mine mounted in a small 1 inch PVC pipe with caps on both ends. I will probably fill it with epoxy but I suspect the 1-ATM pvc will hold up fine for the depths I'll be at. And yes, it will be mounted externally, probably 3 feet or so away from the metal hull. However, with programming I can filter any deflection offset caused by the metal hull.</DIV><DIV><BR></DIV><DIV>Jon<BR><BR></DIV><DIV style="display: block;"> <DIV style="font-family: times new roman, new york, times, serif; font-size: 16px;"> <DIV style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <DIV dir="ltr"> <FONT size="2" face="Arial"> <HR size="1"> <B><SPAN style="font-weight:bold;">From:</SPAN></B> Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> <B><SPAN style="font-weight: bold;">To:</SPAN></B> Personal Submersibles General Discussion <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> <BR> <B><SPAN style="font-weight: bold;">Sent:</SPAN></B> Tuesday, October 30, 2018 10:46 PM<BR> <B><SPAN style="font-weight: bold;">Subject:</SPAN></B> Re: [PSUBS-MAILIST] compass<BR> </FONT> </DIV> <DIV><BR><DIV><DIV><DIV></DIV><DIV>Jon,</DIV><DIV>I have to buy a compass some time so looked it up but it's pretty expensive</DIV><DIV>at $188-. I also saw a video on it dated 2010, so it's at least 8 years old.</DIV><DIV>There are modules for less than $20- but not tilt compensated.</DIV><DIV>It does say it is "high end" but is there much difference between a cheap</DIV><DIV>& expensive compass? ( I know nothing about this).</DIV><DIV>The thought came to mind that you could possibly cover it with resin &</DIV><DIV>mount it outside the hull away from magnetic interference.</DIV><DIV>Alan</DIV><DIV> </DIV><DIV><DIV><BR>On 31/10/2018, at 1:36 PM, Jon Wallace via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:16px;"><DIV><SPAN></SPAN></DIV><DIV>Hank,</DIV><DIV><BR></DIV><DIV dir="ltr">I use HMC6343 tilt compensated compass from Honeywell, with arduino or Raspberry pi microprocessor. Display can be in many formats. These are sometimes hard to get but looks like CANAKIT has some.</DIV><DIV dir="ltr"><BR></DIV><DIV dir="ltr"><A href="https://www.canakit.com/compass-with-tilt-compensation-hmc6343-com-08951.html">Compass with Tilt Compensation - HMC6343</A><BR></DIV><DIV dir="ltr"><BR></DIV><DIV><BR></DIV><DIV dir="ltr" style="max-width:400px;font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;"> <A href="https://www.canakit.com/compass-with-tilt-compensation-hmc6343-com-08951.html" style="text-decoration:none;color:#000;"> <TABLE cellpadding="0" cellspacing="0" border="0" style="max-width:400px;"><TBODY><TR><TD colspan="1" rowspan="1" width="400"> <TABLE cellpadding="0" cellspacing="0" border="0" width="100%" style="max-width:400px;"><TBODY><TR><TD colspan="1" rowspan="1" valign="top" style="background:#000 url('https://s.yimg.com/vv//api/res/1.2/JIOutLsLSdjMIWhfDnacyw--~A/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/https://www.canakit.com/Media/400/NoImage.jpg.cf.jpg') no-repeat center center;background-size:cover;min-height:200px;position:relative;" background="https://s.yimg.com/vv//api/res/1.2/JIOutLsLSdjMIWhfDnacyw--~A/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/https://www.canakit.com/Media/400/NoImage.jpg.cf.jpg" bgcolor="#000000"> <TABLE cellpadding="0" cellspacing="0" border="0" style="width:100%;"><TBODY><TR><TD colspan="1" rowspan="1" valign="top" style="background:transparent url('https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png') repeat left top;min-height:200px;" background="https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png" bgcolor="transparent"> <TABLE height="185" style="width:100%;min-height:185px;min-height:185px;"><TBODY><TR><TD colspan="1" rowspan="1" style="text-align:left;text-align:left;padding:15px 0 0 15px;vertical-align:top;"> </TD><TD colspan="1" rowspan="1" style="text-align:right;padding:15px 15px 0 0;vertical-align:top;"> <DIV></DIV> </TD></TR></TBODY></TABLE> </TD></TR></TBODY></TABLE> </TD></TR><TR><TD colspan="1" rowspan="1"> <TABLE align="center" cellpadding="0" cellspacing="0" border="0" style="background:#fff;position:relative;z-index:2;width:95%;max-width:380px;border:1px solid #e0e4e9;border-bottom:3px solid #000000;margin-top:-40px;margin-left:auto;margin-right:auto;"><TBODY><TR><TD colspan="1" rowspan="1" style="background-color:#ffffff;padding:16px 0 16px 12px;vertical-align:top;"> </TD><TD colspan="1" rowspan="1" style="vertical-align:middle;padding:16px 12px;width:99%;"> <H2 style="font-size:16px;line-height:19px;margin:0 0 4px 0;font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;">Compass with Tilt Compensation - HMC6343</H2> <DIV style="font-size:11px;line-height:15px;color:#999;">Compass with Tilt Compensation - HMC6343</DIV> </TD><TD colspan="1" rowspan="1" style="text-align:right;padding:16px 12px 16px 0;"> </TD></TR></TBODY></TABLE> </TD></TR></TBODY></TABLE> </TD></TR></TBODY></TABLE> </A></DIV><DIV><BR></DIV><DIV><BR></DIV><DIV dir="ltr"><BR><BR></DIV><DIV style="display:block;"> <DIV style="font-family:times new roman, new york, times, serif;font-size:16px;"> <DIV style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <DIV dir="ltr"> <FONT size="2" face="Arial"> </FONT><HR size="1"> <B><SPAN style="font-weight:bold;">From:</SPAN></B> hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR> <B><SPAN style="font-weight:bold;">To:</SPAN></B> irox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> <BR> <B><SPAN style="font-weight:bold;">Sent:</SPAN></B> Monday, October 29, 2018 10:48 PM<BR> <B><SPAN style="font-weight:bold;">Subject:</SPAN></B> Re: [PSUBS-MAILIST] compass<BR> </DIV> <DIV><BR><DIV><DIV><DIV style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;"><DIV></DIV>
<DIV>Ian, </DIV><DIV>Thank you, sorry about the sharp bracket. I will mount the new one on a plastic pole behind the CT</DIV><DIV>Hank</DIV><DIV><BR></DIV>
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On Monday, October 29, 2018, 6:43:07 PM MDT, irox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:
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<DIV><DIV><DIV><DIV style="font-size:13px;color:rgb(0, 0, 0);font-family:arial, sans-serif;"><DIV><BR></DIV><DIV>Hi Hank!</DIV><DIV><BR></DIV><DIV>you could google for "Fluxgate compass" and see what you're comfortable with from an electronics point of view.</DIV><DIV><BR></DIV><DIV>You could build your own for ~$50 ($15 for compass, ~ $10 for microcontroller, ~$20 for a display):</DIV><DIV><A href="https://www.adafruit.com/product/1120">https://www.adafruit.com/product/1120</A></DIV><DIV><BR></DIV><DIV>But I imagine you'd prefer something more turn key, like:</DIV><DIV><A href="https://www.starmarinedepot.com/clipper-compass-system-w%2Fremovable-fluxgate-sensor.html">https://www.starmarinedepot.com/clipper-compass-system-w%2Fremovable-fluxgate-sensor.html</A></DIV><DIV><BR></DIV><DIV>The sensor would need mounted outside, away from the hull, like a regular compass.</DIV><DIV><BR></DIV><DIV>Cheers!</DIV><DIV> Ian.</DIV><DIV>P.S.: Please make it less sharp that the current compass mounting bracket on Gamma. :-)<BR></DIV><BR><BLOCKQUOTE style="padding-left:5px;margin-left:0px;border-left:#0000ff 2px solid;font-weight:normal;font-style:normal;text-decoration:none;font-size:10pt;font-family:arial, sans-serif;color:black;">-----Original Message-----
<BR>From: hank pronk via Personal_Submersibles
<BR>Sent: Oct 29, 2018 5:23 PM
<BR>To: Personal Submersibles General Discussion
<BR>Subject: [PSUBS-MAILIST] compass
<BR><BR><DIV>Hi All,</DIV><DIV>It is time to deal with a compass for Gamma. I would like a solid state compass with no moving parts. Jon, I think you mentioned I could do something for 200 dollars? Any ideas are welcome.</DIV><DIV>Hank</DIV><DIV style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;"></DIV></BLOCKQUOTE></DIV></DIV></DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV></DIV>
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