Hi Folks, I have a temperature reading of an MQTT thing in Kelvin and want to convert it into °C my understanding of the UoM is, that the conversion is done by the OH3 Framework when i define the unit correctly Maybe you can help me here thing file: Bridge mqtt:broker:SignalK "SignalK" [ ho…

You need to do the desired conversion in the channel definition.

[image] Michael_Frey: output is still in Kelvin What do you mean by “output”, where are you looking?

[image] opus: You need to do the desired conversion in the channel definition. :slight_smile: okay … but where ? The unit is set to Kelvin and according to the openhab UoM Documentation the conversion between units should be done by the OH framework

Instead of telling the channel to give the unit “K” use “°C”.

[image] rossko57: [image] Michael_Frey: output is still in Kelvin What do you mean by “output”, where are you looking? i just display the output in the UI

Okay, we’ll guess that you are using OH3 and are referring to MainUI. You’ve not told us what you see, but I guess its 285 K or similar? The Item holds a temperature, it doesn’t matter what units that’s in so long as we convert to what we prefer when used e.g. displayed. Embedding a [state presen…

[image] rossko57: Embedding a [state presentation] in a file-defined Item’s label is a legacy of OH1. It’ll work fine with legacy UI like BasicUI used with a sitemap. Nope … the temperature in the sitemap is also 290.6 K and not °C I am confused… because I found this conversation which desc…

[image] opus: Instead of telling the channel to give the unit “K” use “°C”. nope this doesn’t work at all, because the temperature reading on the channel is in Kelvin

:roll_eyes: I was wrong! Setting the channel “unit” results only in a changed unit-sign and not in a conversion. I must have missunderstood something. Sorry for that! @rossko57 Thanks for stepping in!

Absolutely no problem :slight_smile: i am happy for every litte help here …

MQTT Temperature conversion Kelvin to Celsius

Setup, Configuration and Use Items & Sitemaps

rossko57 (Rossko57) March 15, 2021, 12:02pm 13

Comment: Opus digging into this further in

And it looks like MQTT binding has a bug here.