[PSUBS-MAILIST] Optical Oxygen Sensors

[Alan via Personal_Submersibles]

Hi Jon,
I was a bit bamboozled by one products description of code for data transmission
& thought it would be easier to just have a voltage or an amperage range to
deal with. I don't need the temperature & pressure data as I have other sensors
for that. The arduino uno B I have has only one tx rx option; however you prompted
me to review things & found that the arduino mega has 3 tx rx ports & so would do 
for my 3 sensors. Still considering my options.
I am looking to use the arduino & raspberry pi but have been going round in circles
a bit. Was learning to program the arduino, then decided no, I need to use the
raspberry Pi, so was learning Python for programming that. Now I have found out
that the raspberry Pi doesn't have any analog pins & has a small maximum
current draw. 
Is there an alternative to those two that is a bit more robust?
Alan
 

> On 8/08/2019, at 2:28 PM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> CO2 meter has an RS485b analog model.  But I'm curious, why use voltage instead of serial?
> 
> Jon
> 
> 
> On Wednesday, August 7, 2019, 09:45:45 PM EDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hi,
> I've been reading a bit about the solid state optical oxygen sensors which
> have a longer life & are more reliable than traditional galvanic cel ( battery)
> type O2 sensors. 
> Poseidon developed them for the dive industry & they were hailed as a break
> through at the time. There is a company, SST sensing that is marketing them for 
> varying applications....https://www.sstsensing.com/optical-oxygen-sensors-key-benefits-and-applications/
> Is any one familiar with them? There seems to be a big price difference between
> varying brands.
> The ones I've seen are calibrated internally for pressure & temperature & transmit 
> data rather than a voltage or current reading. I am looking for a cheap option that 
> has a current or voltage signal rather than data & I will be using something like a raspberry Pi or Arduino to process the reading.
> I am also wanting 3 as in a rebreather to compare readings.
> Do they need much of an O2 flow over them or are they ok just being placed 
> randomly within the hull?
> Cheers Alan
> <image1.jpeg>
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