Ability to use sensor state as attribute value

Configuration
1

Hi,

I’d like to use the state of a specifc sensor as the attribute value of another sensor.
e.g.

 sensor.last_reset:    2021-01-01T14.00
 sensor.total:
    last_reset:    {{ states('sensor.last_reset') }}

Through the customize.yaml I’m not able to specify a value template to refer to the sensor that has the proper state value I need.
My sensors are already existing, hence a template sensor is not an option…

Any help would be appreciated.

2

What kind of sensor is sensor.total?
If it’s a template one, please show the definition;

3

As I highlighted in my original post:

These are sensors from Tasmota. Hence I cannot template sensor.total…

4

Unless last_reset would be a constant, in which case you can use the “customize” way via GUI or YAML, you will have to create a new template sensor based upon your tasmota one to achieve that.

5

Piggybacking off of koying’s reply…

In order to do what you have described (combine information from multiple existing sensors) you will need to create a template sensor, this is not possible through customize.yaml.

template:
  - sensor:
      - name: "Tasmota Combined"
        state: "{{ states('sensor.total'}}"
        attributes:
          last_reset: "{{ states('sensor.last_reset') }}"