Anybody out here using ESPAltherma to read data from a Daikin Altherma Heat Pump?

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Hi,

I’m wondering if there’s anybody here using an ESPAltherma to get information from their Daikin Altherma Heat Pump.

I was very annoyed at the little data Daikin provides on their Daikin Onecta platform, so I looked around if there were other possibilities to obtain the data I wanted to see and found the ESPAltherma project.

So, I ordered an M5Stick C Plus 2, forked the ESPAltherma code and started playing around, only to find out what I was looking for, the power consumption, was not exposed over the serial interface to which the ESPAltherma connects.

Anyways, I created a Homey app to consume the data from ESPAltherma and I’ve been using it for some time now and it seems to run good.
Not everything is done yet, some capability icons need to be added for example, but the basic working is ok.
For now, I’ve also added some calculations to determine the power usage, but that’s based on the current usage on the DC side of the inverter and some assumptions so I’m not sure how accurate this information is (Then again, Daikin must be using roughly the same method to calculate usage and send it to the Onecta Platform)

Right now I’m looking for people interested in testing the app before I publish it to the App Store. If you want to test, you’ll need to be able to run Homey apps from the CLI, something I’m sure users that have setup an ESPAltherma will be perfectly capable off.

The code can be found here: GitHub - daneedk/com.altherma.mqtt

Thanks!

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Daikin Altherma via ESP32 koppelen aan Homey
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Hi Danee, I’d really like to test your app. I have a 3-phase Daikin Altherma 3 9kW with an indoorunit type ETBH12E9W and an outdoorunit type EPRA10EW1. I have a M5stickCPlus 1.1 connected to it and managed to partially connect it to my Homey 2023. After some problems with the heat pump, I removed it to avoid giving the installer any reason to believe the problem was with the M5stick. Now, however, I’d like to gain insight into the heat pump’s data again. So your question is perfectly timed. However, I have no experience with Hoemy CLI and my English isn’t great either, haha.

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Hi @Jan-Willem_Gehrels,

Welcome to the community! I don’t think your English is that bad, I’m sure it’s sufficient to get this working!
There’s a great guide here on how to install an app using the CLI: [HOW TO] CLI install method

Have a look at it, if you run into problems, just let us know, I’m sure there’s plenty others that can and will help you install and run the app.
If you run into problems with the app itself just let me know in this topic.

Or, if you feel you’re not comfortable enough running an app using the CLI, wait a bit, I think I’l release a test version of the app this weekend.