<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Hi Jon,</div><div>I was a bit bamboozled by one products description of code for data transmission</div><div>& thought it would be easier to just have a voltage or an amperage range to</div><div>deal with. I don't need the temperature & pressure data as I have other sensors</div><div>for that. The arduino uno B I have has only one tx rx option; however you prompted</div><div>me to review things & found that the arduino mega has 3 tx rx ports & so would do </div><div>for my 3 sensors. Still considering my options.</div><div>I am looking to use the arduino & raspberry pi but have been going round in circles</div><div>a bit. Was learning to program the arduino, then decided no, I need to use the</div><div>raspberry Pi, so was learning Python for programming that. Now I have found out</div><div>that the raspberry Pi doesn't have any analog pins & has a small maximum</div><div>current draw. </div><div>Is there an alternative to those two that is a bit more robust?</div><div>Alan</div><div> </div><div><br>On 8/08/2019, at 2:28 PM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div class="ydp3da52231yahoo-style-wrap" style="font-family: times new roman, new york, times, serif; font-size: 16px;"><div></div>
<div dir="ltr" data-setdir="false">CO2 meter has an RS485b analog model. But I'm curious, why use voltage instead of serial?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jon</div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Wednesday, August 7, 2019, 09:45:45 PM EDT, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="ydpa20c71cbyiv7392378644"><div><div><span></span></div><div>Hi,<div></div><div>I've been reading a bit about the solid state optical oxygen sensors which</div><div>have a longer life & are more reliable than traditional galvanic cel ( battery)</div><div>type O2 sensors. </div><div>Poseidon developed them for the dive industry & they were hailed as a break</div><div>through at the time. There is a company, SST sensing that is marketing them for </div><div>varying applications....<a href="https://www.sstsensing.com/optical-oxygen-sensors-key-benefits-and-applications/" rel="nofollow" target="_blank">https://www.sstsensing.com/optical-oxygen-sensors-key-benefits-and-applications/</a></div><div>Is any one familiar with them? There seems to be a big price difference between</div><div>varying brands.</div><div>The ones I've seen are calibrated internally for pressure & temperature & transmit </div><div>data rather than a voltage or current reading. I am looking for a cheap option that </div><div>has a current or voltage signal rather than data & I will be using something like a raspberry Pi or Arduino to process the reading.</div><div>I am also wanting 3 as in a rebreather to compare readings.</div><div>Do they need much of an O2 flow over them or are they ok just being placed </div><div>randomly within the hull?</div><div>Cheers Alan</div></div><div><image1.jpeg></div></div></div>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div>
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