Adding a sensor offset using STATES

Configuration
1

I want to apply an offset to my temperature sensor using STATES in the developer tools. I added a value template to the attributes of the sensor.

Entity: sensor.0xa4c138f90a81f552_temperature

State attributes:

state_class: measurement
unit_of_measurement: °C
device_class: temperature
friendly_name: ZBTemp04 Temperature
value_template: "{{states('sensor.0xa4c138f90a81f552_temperature') | float + 10.0 }}

When I click on the “set state” or “refresh” button the state does not change.
Is this the right way to apply the offset?

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2

You are setting attributes there.
See the line above State attributes (YAML, optional).
The state is set above.
But I’m quite sure you can’t use templates there.

3

You’ll need to create a template sensor helper to do that, with a state template of:

{{ states('sensor.0xa4c138f90a81f552_temperature')|float(0) + 10.0 }}

You can’t ask a sensor to be 10 higher than itself…