trv-calibration.yaml

blueprint:
  name: Calibrate TRV using external sensor
  description: Calibrate radiator TRV temperature sensor using an external temperature sensor.
  domain: automation
  input:
    external_temperature_sensor:
      name: External Temperature Sensor
      description: Temperature sensor with correct temperature, used to calibrate TRV one.
      selector:
        entity:
          filter:
            domain: sensor
            device_class: temperature
    trv_calibration_entity:
      name: TRV calibration entity.
      description: Calibration entity from the TRV.
      selector:
        entity:
          filter:
            domain: number
    thermostat_entity:
      name: TRV Thermostat entity
      selector:
        entity:
          filter:
            domain: climate
variables:
  external_temperature_sensor_state: !input external_temperature_sensor
  trv_calibration_entity_state: !input trv_calibration_entity
  thermostat_entity_state: !input thermostat_entity
  
trigger:
  - platform: state
    entity_id:
      - !input external_temperature_sensor

action:
  - service: number.set_value
    target:
      entity_id: !input trv_calibration_entity
    data:
      value: >-
        {% set current_calibration = states(trv_calibration_entity_state) | int %} 
        {% set trv_calibrated = state_attr(thermostat_entity_state, 'current_temperature') |int %}  
        {% set th_real = states(external_temperature_sensor_state) | round(2) %}  
        {% set trv_real = trv_calibrated-current_calibration %}  
        {% set new_calibration = (th_real-trv_real) | round(0) %}  
        {% set min_calibration = state_attr(trv_calibration_entity_state, 'min') %} 
        {% set max_calibration = state_attr(trv_calibration_entity_state, 'max') %}

        {{ [[new_calibration, min_calibration] | max, max_calibration] | min }}