I have four humidity/temperature sensors that report their measurements via MQTT. For three of them my template for absolute humidity works well, for one sensor it stays at “Unavailable” indefinitely:
- name: "Absolute humidity Sensor 1"
unit_of_measurement: g/m³
state_class: measurement
device_class: humidity
state: >-
{% set h, t = states('sensor.htsensor1_humidity')|
float, states('sensor.htsensor1_temperature') %}
{% if not h or t == 'unknown' -%}
'unknown'
{%- else %}
{% set t = t | float %}
{{ (h*6.112*2.1674*e**((t*17.67)/(t+243.5))/(t+273.15))|round(2) }}
{% endif %}
The one that stays “Unavailable” reports temperature and humidity independently and in irregular intervals (it tries to save on energy by only reporting a value if a certain change threshold has been reached). htsensor1_temperature and htsensor1_humidity always show their latest value in the default “Overview” dashboard, even when they are somewhat old. But the template stays at “Unavailable”. Any ideas?