Dedicated Display Details

There are two dedicated displays in the house for showing real-time information. One is connected to the server where all the incoming information is processed, and the other is in the living room.

The living room display, which is on all the time, is a 1080p LED panel that consumes 10 watts. This display is connected to a networked computer that also connects to the TV over HDMI. A USB IR receiver is plugged into this computer for operating the display with a remote control. The main screen is shown below. The left center and right center graphics are selected from a list to configure the screen to the event of interest. In this case the screen is set to monitor thermal power generation. At the time the screenshot was taken, solar thermal energy was being used to heat the domestic hot water tank.

The chart period for each strip chart can be selected from the menus. The period ranges from 3/4 hour to 12 hours. The shortest period of 3/4 hour corresponds to a 5 second sample rate. The wind speed chart differs from the others with a 2.5 second sample rate.

screenshot of the display in solar thermal mode
The five Krell gauges at the top of the screen show the most dynamic information collected from the various sources. When there is no real-time information of interest, the center of each gauge shows a daily total of that measurement, as is the case for rain.

Each gauge sweeps from one measurement to the next with a 1 degree increment every 10 msec. Full scale on the three power gauges is 5000 watts. When there is an overflow, the gauge auto-scales itself by 10 times and changes its color and unit's label.

The Pwr gauge shows how much power the house is consuming not including the power used for heating water for both domestic use and the hydronic system. The power used to heat water is displayed in the second gauge as shown in the screenshot below. The label on that gauge says Heat when the power source is electricity, and it says Solar when the source is the sun.

The Rain gauge shows rain rate in inches per hour. Since the rate can vary over several orders of magnitude, this gauge displays the rate in log 10.

The far right wind display performs two functions. Arrows show the current (salmon) and average (green) wind direction. It also shows system health by using the wind rose as a clock face. When an update is received from one the four sensor-data-interface daemons, the color-coded ball moves to the current seconds. In the center of the compass face, under of legend with the color codes is the percentage of packets successfully received over the radio link used by the Davis Vantage Pro weather station.

screenshot of the display in household power and weather mode
The lower right corner displays the short term forecast. The information comes from the Eugene, OR point forecast matrix which is produced by the National Weather Service. The number on the far right is the upcoming high or low temperature forecast. The bottom line combines the precipitation (rain, showers, snow and show showers) and cloud cover forecast. Upper case is used for precipitation and lower case for cloud cover. Showers are marked with a subscript S. The legend will be one of Rain, Snow, or Sky. Sky appears when there is no precipitation forecast for the next 48 hours.
screenshot of the display in solar power mode
This display is set up to focus on solar power. The cyan colored temperatures at the top are from the solar thermal system, and show the temperature of the collector and the top and bottom of the domestic hot water tank.