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Thread: DIY temp stick.

  1. #1
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    DIY temp stick.

    I have been thinking of building a temp stick but have a few questions.

    What temp range does the scrubber work at?
    How many sensors would be optimal?

    What I am thinking is 3 LEDs per sensor.
    One to show the circuit is working, one for warm , one for hot.


    How do other units work?

  2. #2
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    Re: DIY temp stick.

    Quote Originally Posted by Packhorse  View Original Post
    I have been thinking of building a temp stick but have a few questions.

    What temp range does the scrubber work at?
    How many sensors would be optimal?

    What I am thinking is 3 LEDs per sensor.
    One to show the circuit is working, one for warm , one for hot.


    How do other units work?

    Hi Greg

    i dont think it is a matter of warm and hot as I guess the hight increase depends on too many factors.
    As I am aware most units just measure the temp. increase. A little bit like the stuff you can glue to teh outside of you mug and it changes color as it gets warm.

    It would be however interesting if you can measure the temp increase on the outside of teh canister ? as this would be great for aftermarket to a variety of Rebreather's.

    Basically you would compare the temp at the sensor to ambient temp, and if there is a significant temp increase you would read this.

    cheers
    Herman

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    Last edited by divelermentov; 28th September 2009 at 03:27.

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    Re: DIY temp stick.

    Maybe one sensor every 1inch ??

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    Re: DIY temp stick.

    CO2 sensor

    Pete did a superb job back in 2002.
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    Re: DIY temp stick.

    Excellent set up. Thanks for the link.

  6. #6
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    Re: DIY temp stick.

    what you could do as well
    3 leds per sensor
    1st led shows sensor is on
    2nd led comes on when delta c positive
    3rd led comes on when delta c is negative

    this way you would have two bands of leds moving thru the display, showing a) that the scrubber is getting warm - therefore is working and b) cooling of again.

    If you base this on delta c rather than absolute temp this should work on cold as well as warm water.
    Secondly if you now can attach this to the outside of the scrubber you wouldn't need any extra cables to go thru the scrubber, if the sensors are sensitive enough they should still pick up a temp increase.

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    Re: DIY temp stick.

    I am not an electronics expert but I recently discovered the Arduino devices and wondered if they might be useful for projects like this. Maybe they are no good at A/D conversion. I don't know.

    I did think that they might make a good ascent rate alarm.

    I'd quite like a temp stick in the KISS to check scrubber operation prior to diving. Just knowing that there is no bypass would be good.

  8. #8
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    Re: DIY temp stick.

    I was hoping to make an analogue device as I am crap at writing code and never done any A-D stuff.
    But then digital is probably the best way to go.

    Problem is I need to build 2 as I use parallel IDA 71 scrubbers.

  9. #9
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    Re: DIY temp stick.

    I somehow wld prefer analog, less chance for the device to hang , and maybe if you could make the numeric sclae in german even i wld know how to read it

    cheers
    herman the german

  10. #10
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    Re: DIY temp stick.

    Quote Originally Posted by divetheworld  View Original Post
    CO2 sensor

    Pete did a superb job back in 2002.
    Anything new on this idea? Seems like it worked very well.

    Cheers,
    Hunter

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