HR92 Observations on temperature and control processing

[bruce_miranda]

I too use an HGI80 but can see only 1 decimal place on the Dashboard and Temperature pages (and graphs too). I'm currently on the latest stable Version: 3.5877

I wonder if the Hardware and Devices set up using the HGI80 are different from those set up via the Script. I know some Devices are able to show 3 decimal places (e.g. Utility meters)

[paulockenden]

Never run 'apt-get upgrade'

Yeah, I typed upgrade by mistake. Old habit, especially as the two words are so similar.

But there was something wrong with my Pi anyway, so I'm doing a full dev build, with the HGI80 installed.

Perhaps I should take an image when I've finished - might save others a few hours work.

P.

[DanD]

I too use an HGI80 but can see only 1 decimal place on the Dashboard and Temperature pages (and graphs too). I'm currently on the latest stable Version: 3.5877

I wonder if the Hardware and Devices set up using the HGI80 are different from those set up via the Script. I know some Devices are able to show 3 decimal places (e.g. Utility meters)

I'll take another look at the Domoticz code as I must have missed a decimal place setting somewhere. It's surprising that the Evohome devices show different numbers of decimal places in different installations as I thought the scripting and HGI80 device creation code was shared and the javascript/html code which controls the display screens doesn't distinguish between the different Evohome set-ups.

Dan

[DBMandrake]

I'll take another look at the Domoticz code as I must have missed a decimal place setting somewhere. It's surprising that the Evohome devices show different numbers of decimal places in different installations as I thought the scripting and HGI80 device creation code was shared and the javascript/html code which controls the display screens doesn't distinguish between the different Evohome set-ups.

Dan

Yes it is strange. With the Web API scripts I only see one decimal place on the little hovering info boxes on the temperature graphs but I definitely get two decimal places elsewhere, like Temperature and Dashboard:

[bruce_miranda]

And here is mine, exact same version same screen but using the HGI80.

Attachment 889

[theasman]

Yeah, I typed upgrade by mistake. Old habit, especially as the two words are so similar.

But there was something wrong with my Pi anyway, so I'm doing a full dev build, with the HGI80 installed.

Perhaps I should take an image when I've finished - might save others a few hours work.

P.

Paul I would be very interested in an image once you've done it. Tony.

[DanD]

Hi,

I particularly enjoyed the earlier comments about a nerdy group dedicated to investigating this . Anyway, all the detailed posts have helped me track down where the Domoticz code implements the 0.1 rounding of the raw temperature values from the non-scripted Evohome temperatures. For those who are particularly interested, it's in Mainworker.cpp where the raw 4 digit temperatures are converted to 1dp (this explains why I missed it when I scoured the Evohome.cpp code). I'll submit an update to correct this and remove the rounding.

Thanks for providing all the detailed info.

Dan

[bruce_miranda]

Dan, so is Mainworker not called when adding the Hardware, Devices and Temperature updates via the script

[DanD]

Hi Bruce,

It's a little more complicated as Mainworker does get called when Evohome receives updates via the script, but the script only uses the data structure evohome1 for its updates. The HGI80 uses a different data structure (evohome2) for its zone temperature updates and it's the Mainworker processing code for this data structure that contains the 1dp rounding code. C++ programming is such fun !

Dan

[bruce_miranda]

I'm glad you still find C++ fun, it drove me nuts when I had to learn it and use it. 25 years on, I am a lot happier that my livelihood didn't depend on my skill with C++.