dew point home assistant template sensor

dewpoint sensor

{% set temperature = states('sensor.indoor_outdoor_meter_fea7') | float %}
{% set humidity = states('sensor.indoor_outdoor_meter_fea7_humidity') | float %}
{% set a = 17.27 %}
{% set b = 237.7 %}
{% set alpha = ((a * temperature) / (b + temperature)) + (log(humidity / 100.0) if humidity > 0 else 0) %}
{% set dewpoint = (b * alpha) / (a - alpha) %}
{{ dewpoint.real | round(1) }}