Simple leaf wetness chart card

Who it’s for

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

What it does

A sensor currently reading 68% shows an orange value — Wet — above a chart that reveals whether the canopy has been drying out or staying saturated over the selected period.

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

How to set up

Data keys

Key	Role	Type	Description
leaf	Chart series	Timeseries	Leaf wetness index 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 Leaf wetness, 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
0–10	Dry	Blue
10–50	Moderate	Orange
50–90	Wet	Orange
90+	Saturated	Red

How to customize

• To use your own wetness thresholds — edit the color ranges on the Latest data key; adjust the four default bands to match your crop’s spray thresholds.
• To hide or show the chart — toggle Show chart in the widget settings.
• To change the chart line color — set Chart color.
• To show min, max, or total in the legend instead of avg — edit the Legend settings.
• 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 trend shape matters more than the exact period-over-period change. Add the full leaf wetness chart card if you need a delta percentage alongside the chart.
• A chart that rises sharply after rainfall and stays elevated for hours indicates the canopy dried slowly — long wet periods are riskier for disease than brief spikes.