<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div><div>I nearly said it is in line with my KIC ( Keep It Complicated) principal to</div><div>wind you up.</div><div>In my case, in a very small hull, I will have a lot less time to respond if</div><div>my air content / pressure changes. That's why I'll need 2 scrubbers </div><div>like DW. I am going to pursue this colour sensor thing as it's just another</div><div>aid to help monitor absorbent usage. As you say monitoring the time</div><div>is the best way, & I'll probably do that electronically too!</div><div>BTW, I notice from your video thar you are not driving a model T Ford anymore!</div><div>Alan</div><div><br></div><div><br><br><div>Sent from my iPad</div></div><div><br>On 25/04/2017, at 12:14 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1492991495765_39898"><span>Alan,</span></div><div id="yui_3_16_0_ym19_1_1492991495765_39897" dir="ltr"><span id="yui_3_16_0_ym19_1_1492991495765_39896">I love your solutions, not within the KISS principal mind you. I like your idea to use a toy helicopter levelling system to control solenoids for level sinking. </span> I just keep track of the time my scrubber is on. </div><div id="yui_3_16_0_ym19_1_1492991495765_39897" dir="ltr">Hank</div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Sunday, April 23, 2017 10:14 PM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv6601001618"><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--><div><div style="color:#000;background-color:#fff;font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2835"> I like the idea of color indicating absorbent, </div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2834" dir="ltr">only problem is my scrubber will be positioned where I can't see it.</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2891" dir="ltr">I just did a quick Google & came up with this color sensor.</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2849" dir="ltr"><a rel="nofollow" class="yiv6601001618enhancr2_79511402-752b-2c79-17fc-c344ff594f87" id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2859" target="_blank" href="https://www.adafruit.com/product/1334">RGB Color Sensor with IR filter and White LED - TCS34725</a></div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3073"><br></div><div class="yiv6601001618yahoo-link-enhancr-card yiv6601001618yahoo-link-enhancr-not-allow-cover yiv6601001618ymail-preserve-class yiv6601001618ymail-preserve-style" id="yiv6601001618enhancr2_79511402-752b-2c79-17fc-c344ff594f87" style="font-family:"Helvetica Neue", Helvetica, Arial, sans-serif;max-width:400px;" dir="ltr" data-size="medium" data-type="yenhancr" data-category="article" data-embed-url="" data-url="https://www.adafruit.com/product/1334"> <a rel="nofollow" class="yiv6601001618yahoo-enhancr-cardlink" id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2890" style="color:rgb(0, 0, 0);text-decoration:none;" target="_blank" href="https://www.adafruit.com/product/1334"> <table class="yiv6601001618card-wrapper" id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2889" style="max-width:400px;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2888"><tr id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2887"> <td width="400" id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2886"> <table width="100%" class="yiv6601001618card-info" id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2885" style="background:rgb(255, 255, 255);border-width:1px 1px 3px;border-style:solid;border-color:rgb(224, 228, 233) rgb(224, 228, 233) rgb(0, 0, 0);max-width:400px;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2884"><tr id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2883"> <td style="padding:16px 0px 16px 12px;vertical-align:top;"> </td> <td id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2882" style="padding:16px 12px;width:99%;vertical-align:middle;"> <h2 class="yiv6601001618card-title" style="margin:0px 0px 4px;font-family:"Helvetica Neue", Helvetica, Arial, sans-serif;font-size:16px;">RGB Color Sensor with IR filter and White LED - TCS34725</h2> <div class="yiv6601001618card-richinfo-primary" style="color:rgb(153, 153, 153);line-height:15px;font-size:11px;">By Adafruit Industries</div> <div class="yiv6601001618card-description" style="color:rgb(153, 153, 153);line-height:15px;font-size:11px;">Your electronics can now see in dazzling color with this lovely color light sensor. We found the best color sens...</div> </td> <td class="yiv6601001618card-share-container"></td> </tr> </tbody></table> </td> </tr> </tbody></table> </a></div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2892"><br></div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2893" dir="ltr">If you put multiple sensors down the outside of an acrylic scrubber canister you could</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3008" dir="ltr">read the color change in the absorbent & have it displayed elsewhere. </div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3007" dir="ltr">You could perhaps use the one sensor board with multiple sensors. Another variation is</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_2963" dir="ltr">that you may be able to pick up the heat from the chemical reaction with the infrared</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3030" dir="ltr">sensor & monitor levels that way.</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3029" dir="ltr"> An additional thought on this subject is to put a second CO2 sensor at the outlet of the </div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3053" dir="ltr">scrubber to pick up early when there were higher concentrations of CO2 coming out.</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3074" dir="ltr">So sensor 1 is the ambient atmosphere concentration & sensor 2 is showing what</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3104" dir="ltr">level of CO2 there is from the scrubber that will be mixing with the atmosphere.</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3128" dir="ltr">Alan</div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3103" dir="ltr"><br></div><div id="yiv6601001618yui_3_16_0_ym19_1_1493005766610_3054" dir="ltr"><br></div></div></div></div>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>