Grohe Sense (Ondus)

Would be great with a component for Grohe Ondus that supports their smart sensors for water detection and water guards. Also lets you measure temperature and humitdy in the rooms where you place the sensors.
Anyone with the skills?

The also have a different app for other things “Sensia Arena” for their toilet for instance, don’t know if it works the same way. But I would also like a component for the ondus.

I don’t know if this can help as a starting point, but there already is a binding in openhab:

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This Java client could also be helpful:

+1 on this!

I will get one of these to lower my ensurance cost and would be very happy to see it integrated in Home Assistant.


+1 for this, have one as well in the kitchen.


I’ve looked a bit at this, and started looking at what data one seems to get. From the sense guard itself, it seems to store water usage data since installation (at least since Feb, when I installed mine). There are point-in-time data points like
{"timestamp":"2019-03-03T00:59:47.000+01:00","flowrate":0,"pressure":6.6,"temperature_guard":20} every 15 minutes, and consumption fields with data like {"starttime":"2019-08-04T22:57:20.000+01:00","stoptime":"2019-08-04T22:57:41.000+01:00","waterconsumption":1.4,"maxflowrate":4.2,"hotwater_share":0.4,"water_cost":0.05599,"energy_cost":0.019155} (I have no idea where it gets the hotwater data from as it is just on the in-flow for cold water, or how accurate it is). One really annoying thing is that there does not seem to be any consumption data generated if you leave a tap dripping.

Any ideas for what sort of sensors you’d like to see in Home Assistant? Water consumption today? Total water consumption since beginning of time (or at least as long as the data goes back)? Or is there some entity type suitable for long, historic, data series?

I haven’t seen anything on getting alerts/alarms (e.g., “long-lasting withdrawal”). Does anyone have enough familiarity with the openhab bindings to know if they’ve figured something out there?

Thanks for looking into this, appreciate it a lot!
I myself only have the humidity/temperature sensors and would from there be able to see actual and historical data.
When it comes to the water guard you mention I think water consumption in different time periods along with total consumption makes sense!

No worries, I’ve been meaning to take a look at this since I installed my sense guard in Feb, just hadn’t gotten around to it until now. I put together something that has managed to run at least a few minutes for me without crashing, so I put the code on github for anyone brave enough to try it out: .

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Great, very nice to see people starting with this, the ability to turn on and off the water would be nice. Maybe the ability to “show last water whitdrawal” or something, not sure if its useful, but maybe cool? (type 14.42 there was a 5 minute long withdrawal the used 40 liters)

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