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Color Intensity Chart for mcsTemperature

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    Color Intensity Chart for mcsTemperature

    The color intensity chart provides an alternate view of data which is well suited for showing many sensor readings at the same time in an unclutter format. The line chart serves a handfull of sensors well, but the color chart can chart all sensors available without any line intersections or clusters of data points.

    In this example 4 sensors were selected for simplicity, but the same result applies if all sensors were included. A sample is represented as a vertical bar with width of one or more pixels. If multiple samples occupy the same sample pixel then the average of these samples will be used. The selection of Average, Minimum over range, or Maximum over range is user selectable from the group option pulldown.

    Each sensor's measurements are individually scaled for the range of that sensor for the period being graphed. The data for each sensor will then always have a maximum 16 pixels (user defined), and minimum 0 pixels vertical bar.

    The color is also scaled, but scaled the same for all sensors on the chart. This allows a visual inspection of color to show the relative magnitude of one sensor's reading vs another. At the low end of the scale the color is dark blue. At the upper end of the scale the color is bright pink. A gradient of 16 color shades between these two is used to represent magnitudes between the two extremes.

    This example show checkbox on two sensors. This is used to indicate that the color range should use those two sensors to determine the min and max values to associate with the range of 16 colors. Other sensors will use the same scaling which typically implies that many of their samples will hit the upper or lower limits of the current scaling. This can be seen with the Hot Water sensor in the example.

    The period requested is a 10 day interval ending on Oct 10, 2002. The x axis labels shows the 30th Sept and then nine days in the month of October. The top two sensors charted can be seen to have a daily periodicity. At the beginning of October the Outside temperature had relatively large fluctuations within a day. Toward the middle of the ten day period the high temperatures tended to remain about the same, but the lows were not achieved as earlier in the period.

    The Attic temperature also fluctuated each day and its color being more pink indicates that it became warmer than the outside temperature.

    The fireplace can be seen to be used 6 out of the 10 days. When it was on its temperature spiked, but the duration of its use was very short.

    The hot water temperature does not exhibit daily fluctuations. A redraw of the chart using a 6 or 24 hour scale would should a sawtooth spanning several hours. The color in this case is bright pink since all readings are at the upper limit of 82.5 degrees as defined by the largest value between the attic and outside temperatures.
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