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One off error - or ..?

fortean
Community Member

temp.20230114.png

I have been playing around with the API's lately and I discovered something puzzeling.

What you see above is a plot (generated with gnuplot) of data that I have been gathering from my Nest thermostat, using the Google API's. For now, I simply fetch the data every 5 minutes (using cron) and store it in a file. Then, each day just after midnight, another cronjob will parse the relevant parts of that file into a plot similar to the one you see above. It's still a bit crude, but good enough for me.

The orange line is the room temperature.  The thin red line is the target temperature. It reflects the value of the '.devices[].traits["sdm.devices.traits.ThermostatTemperatureSetpoint"].heatCelsius' API variable. The green line indicates if the pump / burner was active (it was "heating"). 

Now, my schema has been set such that the Nest should have the room at 18 degrees at 8 in the morning, keep the room at that temperature and then allow it to drop after 2200 hours (ten in the evening).

What is puzzling me is that the Nest starts heating the room EXACTLY one hour before it should reach the 18 degrees temperature limit.  It drops off nicely at 2200, as it should. But the red line,TTBOMK, should show the DESIRED temperature and at 7 o clock that should still be 15 degrees. 

Can anybody here clarify the matter?

Is the API returning the value calculated by the Nest to ensure the room is at 18 degrees at 8 o clock - and so, is it simply a weird coïncidence that it is EXACTLY one hour off?

5 REPLIES 5

aatienza
Community Specialist
Community Specialist

Hey fortean,

 

Thanks for reaching out. Let's check — what type of Nest thermostat are you using? Do you have a schedule set on your thermostat? Check out this link about Temperature schedules for the Nest Thermostat. 

 

Best,

Archie

fortean
Community Member

Yes, I have a schedule set on my thermostat. I own a learning thermostat (Nest V.3).

 

Jenelyn_O
Community Specialist
Community Specialist

Hi there,

 

Chiming in — I'm sorry for the delay. I just want to confirm if you're still encountering the issue. Please let me know, as I'll be willing to assist you further. 

 

I appreciate your help, Archie.

 

Best,

Jenelyn

Jenelyn_O
Community Specialist
Community Specialist

Hi there,

 

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

 

Best,

Jenelyn

Jenelyn_O
Community Specialist
Community Specialist

Hi there,

 

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

 

Best,

Jenelyn