How to maintain values until entity appears again

@aristosv wrote:

I am using the code below to show the status of my front door sensor in Home Assistant.

title: DOORS
icon: 'mdi:door'
cards:

- type: button
  entity: binary_sensor.entrance_door_sensor
  icon: 'mdi:door'
  icon_height: 50px
  icon_width: 50px

- type: horizontal-stack
  cards:
  - type: gauge
    name: Battery
    unit: '%'
    entity: sensor.entrance_door_battery
    min: 0
    max: 100
    severity:
     green: 100
     yellow: 50
     red: 20
  - type: gauge
    name: Lux
    unit: 'Lux'
    entity: sensor.entrance_door_lux
    min: 0
    max: 100
    severity:
     green: 100
     yellow: 50
     red: 20

and this is the result

11418×843 244 KB

My problem is that after a few minutes, the sensor goes into standby mode to save battery, and the battery value and lux value are not available any more, until the door opens again, and the sensor sends data to home assistant again.

So it becomes like this

21426×651 227 KB

Is there a way to maintain the values, until the door opens again, and new data is sent? Or maybe replace the yellow squares with something…nicer?

Thanks

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