The Sensor card gives you a quick overview of your sensors state with an optional graph to visualize change over time.
Screenshot of the sensor card.
To add the Sensor card to your user interface, click the Lovelace menu (three dots at the top right of the screen) and then Edit Dashboard. Click the plus button in the bottom right corner and select Sensor from the card picker. All options for this card can be configured via the user interface.
Detail of the graph
1 equals one point/hour,
2 equals six points/hour
Alternatively, the card can be configured using YAML:
type: sensor entity: sensor.illumination name: Illumination