Easy dew point graph from temperature and relative humidity sensors

Feature Requests
1

Really, this could be a generalized “calculate graph value from two sensors” kind of feature, but the one I want it for is dew point from my temp + humidity sensors. The formula could be simple, or more complex for better accuracy:

When this is developed it might also be used to graph temperature differences (a-b), total power draw of a group of sensors (a+b+c+d…), min or max (or both) of a group of moisture sensors, etc.

I’m sure this has been done, more than once, in .yaml - but especially for the dewpoint coming from any number of cheap temp+humidity sensors on the market it would be nice to have an “easy card” to make it happen.

2

I calculate dew point like this.

{{ ((((states('sensor.kitchen_tempurature_temperature') | float(0) - 32 ) | float(0) * (5/9) | float(0)) - ((100 -  states('sensor.kitchen_tempurature_humidity') | float(0) ) / 5) | float(0)) * (9/5)+32) }}
3

See here for options: Dew point sensor

4

That is what that does. It use the temp and humidity from my kitchen sensor. Just change the sensor names in that template.

5

If they are not comfortable using templates there are integration options in that topic.

1 Like
6

Thanks for the pointer… I suppose my ask as a Feature Request is an “easy card” or something to just hand it the temperature and humidity sensors and get dew point out. I’m probably just not familiar with all the aspects of Home Assistant to see how to easily get rujelus22’s formula into a graph, and some day I will learn - but I suspect many HA users never will.

7

Everything you will ever need: GitHub - dolezsa/thermal_comfort: Thermal Comfort sensor for HA (absolute humidity, heat index, dew point, thermal perception) :wink:

8

Thanks, and I’ll get into HACS, eventually. I’m just really impressed so far with what I have been able to setup without “going there.”