Dew point sensor

Configuration
17

For the below temperature and humidity ranges Arden Buck seems to match Lawrence to 1 decimal place. turns out after checking, my macro is using the Arden Buck equation. Dropping the P as the thread on the Home Assistant Community Forum mentions.

Feels Like (Top Right)
Dew Point (Top Left)

image
image1398×357 138 KB

MACRO custom_templates/macros.jinja

{% macro calculate_dew_point(entity_temperature, entity_humidity) %}
  {% set T, RH = states(entity_temperature), states(entity_humidity) %}
  {% if (T == 'unknown') or (RH == 'unknown') %}
    unknown
  {% elif (T == 'unavailable') or (RH == 'unavailable') %}
    unavailable
  {% else %}
    {% set T = T | float %}
    {% set RH = RH | float %}
    {% set a = 6.1121 | float %}
    {% set b = 18.678 | float %}
    {% set c = 257.14 | float %}
    {% set d = 234.5 | float %}
    {% set e = 2.71828 | float %}
    {% set gamma = log((RH/100)*e**((b-T/d)*(T/(c+T)))) | float %}
    {% set dew_point = ((c * gamma) / (b - gamma)) | round(1) %}
    {{ dew_point }}
  {% endif %}
{% endmacro %}

TEMPLATE SENSOR - configuration.yaml/

  - sensor:
    - name: "dewpoint_outside"
      unique_id: 2fac14a6-affd-4985-88d6-67b3cff34e3f
      unit_of_measurement: "°C"
      icon: mdi:thermometer-water
      state: >
        {% from 'macros.jinja' import calculate_dew_point %}
        {{ calculate_dew_point('sensor.netatmo_outdoor_temperature', 'sensor.netatmo_outdoor_humidity') }}