[PSUBS-MAILIST] Scrubber color sensor

[Alan via Personal_Submersibles]

Hank,
I nearly said it is in line with my KIC ( Keep It Complicated) principal to
wind you up.
In my case, in a very small hull, I will have a lot less time to respond if
my air content / pressure changes. That's why I'll need 2 scrubbers 
like DW. I am going to pursue this colour sensor thing as it's just another
aid to help monitor absorbent usage. As you say monitoring the time
is the best way, & I'll probably do that electronically too!
BTW, I notice from your video thar you are not driving a model T Ford anymore!
Alan



Sent from my iPad

> On 25/04/2017, at 12:14 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> 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.   I just keep track of the time my scrubber is on. 
> Hank
> 
> 
> On Sunday, April 23, 2017 10:14 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I like the idea of color indicating absorbent,
> only problem is my scrubber will be positioned where I can't see it.
> I just did a quick Google & came up with this color sensor.
> RGB Color Sensor with IR filter and White LED - TCS34725
> 
> RGB Color Sensor with IR filter and White LED - TCS34725
> By Adafruit Industries
> Your electronics can now see in dazzling color with this lovely color light sensor. We found the best color sens...
> 
> If you put multiple sensors down the outside of an acrylic scrubber canister you could
> read the color change in the absorbent & have it displayed elsewhere.
> You could perhaps use the one sensor board with multiple sensors. Another variation is
> that you may be able to pick up the heat from the chemical reaction with the infrared
> sensor & monitor levels that way.
>   An additional thought on this subject is to put a second CO2 sensor at the outlet of the
> scrubber to pick up early when there were higher concentrations of CO2 coming out.
> So sensor 1 is the ambient atmosphere concentration & sensor 2 is showing what
> level of CO2 there is from the scrubber that will be mixing with the atmosphere.
> Alan
> 
> 
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