Simple soil moisture chart card

Who it’s for

Agronomists, precision farmers, and irrigation managers ask “how has soil moisture changed over time, without the clutter of delta comparisons?” They want to see the current reading and a trend line in one card, nothing more.

What it does

A sensor currently reading 52% shows a blue value — Optimal — above a chart that reveals whether moisture has been rising after an irrigation event or declining toward the stress threshold.

• Large current soil-moisture value color-coded across four bands from Dry to Saturated
• Time-series chart of soil-moisture readings over the selected time window, averaged per interval
• Shows one sensor’s data; it does not compare multiple probes or show period-over-period deltas

How to set up

Data keys

Key	Role	Type	Description
soilMoisture	Chart series	Timeseries	Volumetric water content in %; drives the chart. The Latest value overlay is automatically derived from this same key
Latest	Latest value	Timeseries	The headline figure above the chart. Its own color ranges are where the band colors are edited

The widget ships with a simulated function datasource key labeled Soil Moisture, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

If the key has never reported for the selected time window, the chart is empty and the value overlay shows no data.

Value ranges

Range (%)	Level	Color
0–20	Dry	Red
20–40	Low	Orange
40–60	Optimal	Blue
60–100	Saturated	Dark Blue

How to customize

• To use your own soil-moisture thresholds — edit the color ranges on the Latest data key; adjust the four default bands to match your soil type and crop requirements.
• To hide or show the chart — toggle Show chart in the widget settings.
• To change the chart line color — set Chart color.
• To hide the entity name subtitle or the timestamp — turn off Show subtitle or Show date.
• To match your dashboard’s fonts — set the font options under each data key’s appearance settings.

Tips

• Use this card when the depletion or recharge curve matters more than the exact period-over-period delta. Add the full soil moisture chart card if you need a delta percentage figure alongside the chart.
• A gradual downward slope between irrigations is normal; a sudden drop may indicate a sensor fault or drainage issue worth investigating.
• The shape of the recharge curve after an irrigation event reveals how quickly your soil type absorbs water — a flat plateau means field capacity was reached quickly, while a long rising curve indicates slow infiltration.