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  1. Home
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  3. Temps rounded to whole numbers?

Temps rounded to whole numbers?

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  • DrJeffD Offline
    DrJeffD Offline
    DrJeff
    wrote on last edited by
    #1

    Trying to get the DS18B20 to round to a whole number no decimal point. I'm using this and getting the temps down to .1 decimal point.

    // Fetch and round temperature to one decimal
    		float temperature = static_cast<float>(static_cast<int>((gw.getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)) * 10.)) / 10.;
    

    What do I do next to get a whole number only, I don't like all the minor changes flooding my controller.

    complete node code is below.

    https://codebender.cc/sketch:238531

    Y 1 Reply Last reply
    0
    • DrJeffD DrJeff

      Trying to get the DS18B20 to round to a whole number no decimal point. I'm using this and getting the temps down to .1 decimal point.

      // Fetch and round temperature to one decimal
      		float temperature = static_cast<float>(static_cast<int>((gw.getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)) * 10.)) / 10.;
      

      What do I do next to get a whole number only, I don't like all the minor changes flooding my controller.

      complete node code is below.

      https://codebender.cc/sketch:238531

      Y Offline
      Y Offline
      Yveaux
      Mod
      wrote on last edited by
      #2

      @DrJeff said:

      float temperature = static_cast<float>(static_cast<int>((gw.getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)) * 10.)) / 10.;

      Either store the temperature in an int (and round to nearest integer by adding 0.5 to the temperature):

        int temperature = static_cast<int>(0.5+(gw.getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)));
      

      Or keep it in a float, rounded to the nearest integer:

        float temperature = round(gw.getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)));
      

      http://yveaux.blogspot.nl

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      • DrJeffD Offline
        DrJeffD Offline
        DrJeff
        wrote on last edited by
        #3

        @Yveaux said:

        float temperature = round(gw.getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)));

        I will try this Thanks for the help.

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