Diagrams

Recorded values only become useful as a trend. This page shows the process of creating a graph from a recorded data point to a single-page chart.

First, values must be recorded. Without recording, every diagram remains empty; see Recording Values .

Which adapter

To begin with:echarts . He brings a separate tab to the admin panel where diagrams are compiled.

Build a diagram

1. Install the adapter and create an instance.
2. Open the new tab and create a diagram.
3. Add a first line and assign it the recorded data point. The source of the data is also specified, i.e., from...history ,influxdb orsql .
4. Set and save the time period and label.

If the line remains empty, it is almost always due to one of three reasons: the data point is not being recorded at all, the wrong source has been selected, or the set time period is before the start of the recording.

Sensible settings

• Choose an appropriate time period. A temperature reading over 24 hours is readable, but not over a year.
• To summarize: For long periods, don't plot every single measurement, but rather average values per hour or day. This significantly reduces the load on the browser.
• Units on the axis. A diagram without units is a curve without meaning.
• Two axes at different sizes. Temperature and humidity on the same axis result in an unreadable image.

Incorporate into the image

A finished diagram can be integrated into a visualization . Common widget sets offer a widget that displays a saved diagram; you simply specify which one.

A chart with a very large number of points loads slowly, especially on a tablet. If a page becomes sluggish, a chart is usually the cause.

What happens next?

The basics are now in place. What comes up regularly is updating: installing updates .