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    haro

    @haro

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    Best posts made by haro

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    Latest posts made by haro

    • RE: Air Quality Sensor

      @epierre Now I see your point of view and of course it is better way to reduce the error.

      in the other hand, I found the datasheet in chinese an then a friend translate it.
      the meaning of the name of gases is for 3/4 (Alcohol), 1/4 (Tolueno) or +- (acetona)

      Thank you so much.

      posted in Hardware
      haro
      haro
    • RE: Air Quality Sensor

      @epierre
      Hi, May be I do not explain my point correctly (or maybe I misundertood ), let me try again.
      We adopt a code, which is the next. The blue lines are the points (for each gas we need two points) that we need.
      https://docs.google.com/document/d/1CevnhBLL9uoyZ31kkrMn-SXeOF_4e9YFGmchj46pGPY/edit?usp=sharing

      Specifically we read from the datasheet the pairs of points for CO
      point1 (lg200 , lg1.3)
      Point2 (lg10, lg2.9)
      then, we construct the data format:{ x, y, slope};
      COCurve[3] = {1.0,0.462,-0.268};

      We are wondering about the pair of points for the others gases or the { x, y, slope} data for them, could you share them?.

      and the other hand, the name of gases with 3/4 or 1/4 or +- appears as well in your datasheet (figure 3)... do you know why?

      thank you so much

      posted in Hardware
      haro
      haro
    • RE: Air Quality Sensor

      @epierre Hi...it is ameasing your work 😄

      I am wondering about Mq-135. We have troubles with reading differents gases.
      From the datasheet we read the slopes
      Gas X" X0" "Rs/R0 "Rs/R0 pendiente (log y- log y0)/(log x-log x0)"
      Air 200 10 3.6 3.6 0.00000
      co 200 10 1.3 2.9 -0.26783
      nh4 200 10 0.79 2.7 -0.41024
      c02 200 10 0.8 2.4 -0.36673
      3/4/ 200 10 0.72 1.9 -0.32391
      1/4/ 200 10 0.64 1.5 -0.28432
      +- 200 10 0.59 1.4 -0.28845

      the data are in the next worksheet https://docs.google.com/spreadsheets/d/18Z6XyxwXVsWdMIk9vbUuCucaLJDdmR0QUFSTYG79ftw/edit?usp=sharing

      ¿may you share with us your code for this sensor in order to see your slopes and Rs/R0 values ?
      ¿do you know the meaning of the name of gases with 3/4 or 1/4 or +-

      thank you in advance

      posted in Hardware
      haro
      haro
    • RE: Soil Tensiometer Sensor Network

      @epierre Hi...it is ameasing your work!! 😄

      I am wondering about Mq-135. We have troubles with reading differents gases.
      From the datasheet we read the slopes
      Gas X" X0" "Rs/R0 "Rs/R0 pendiente (log y- log y0)/(log x-log x0)"
      Air 200 10 3.6 3.6 0.00000
      co 200 10 1.3 2.9 -0.26783
      nh4 200 10 0.79 2.7 -0.41024
      c02 200 10 0.8 2.4 -0.36673
      3/4/ 200 10 0.72 1.9 -0.32391
      1/4/ 200 10 0.64 1.5 -0.28432
      +- 200 10 0.59 1.4 -0.28845

      these data are in the next worksheet https://docs.google.com/spreadsheets/d/18Z6XyxwXVsWdMIk9vbUuCucaLJDdmR0QUFSTYG79ftw/edit?usp=sharing

      ¿may you share with us your code for this sensor in order to see your slopes and Rs/R0 values taken from the curve?
      ¿do you know the meaning of the name go gases with 3/4 or 1/4 or +- ?

      thank you in advance

      posted in My Project
      haro
      haro