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:
  - trigger: state
    entity_id: !input external_temperature_sensor

  - trigger: state
    entity_id: !input thermostat_entity
    for:
      seconds: 30

action:
  - variables:
      current_calibration: "{{ states(trv_calibration_entity_state) | int(0) }}"
      trv_temp: "{{ state_attr(thermostat_entity_state, 'current_temperature') | float(0) }}"
      external_temp: "{{ states(external_temperature_sensor_state) | float(0) }}"
      min_calibration: "{{ state_attr(trv_calibration_entity_state, 'min') | int(0) }}"
      max_calibration: "{{ state_attr(trv_calibration_entity_state, 'max') | int(0) }}"

      trv_real: "{{ trv_temp - current_calibration }}"
      raw_calibration: "{{ (external_temp - trv_real) | round(0) }}"
      new_calibration: "{{ [max_calibration, [min_calibration, raw_calibration] | max] | min }}"

  - if:
      - condition: template
        value_template: >-
          {{ trv_temp != 0
             and external_temp != 0
             and (new_calibration - current_calibration) | abs >= 1 }}
    then:
      - service: number.set_value
        target:
          entity_id: !input trv_calibration_entity
        data:
          value: "{{ new_calibration }}"