Question: External Temperature

[theflu]

I see the recommended way to setup external temp is to use the home assistant api. In the event the sensor is no longer working what will happen? Will the unit revert to using its internal sensor or continue with the last known temperature? If it reverts how long does it take to do so?

My current setup uses actions in HA and sets the remote temp on every update HA receives. If the temp sensor hasn't updated in 10 min it will set the temp to 0 so it uses its internal sensor.

Also is the throttle needed? I currently send a new temp every ~10s.

[tmchow]

There is a timeout period for the remote sensor remote_temperature_timeout which controls this. It will revert to the internal temp if this timeout is passed.

[phidauex]

Hi, the two ways to update the temperature are to use an ESPHome "HomeAssistant Sensor" or to manually update the service with an HA Automation. The homeassistant sensor is the default and recommended right now because it is simpler and proving more reliable for most users.

If you have remote_temperature_timeout set, then yes, if the HA sensor stops sending updates, the unit will revert back to the internal temperature sensor after that timeout. I'm using 30 min right now, which seems to work well in my house. You could set it faster if your sensors update faster.

I'm the one who set the 30s throttle in the default settings - I was worried about forcing the unit to accept a new temperature every update cycle, which can be 2-4s, and I don't think there is any physical reason why you'd want it to accept updates that fast anyway - the goal is to slow down the response of the heatpump so it modulates better, so more filtering rather than less should get a better result. You could try a faster throttle if you wanted, however.

[phidauex]

My opinion on the matter isn't very strongly held - I don't think you'll break anything by updating faster (or rather, if it wasn't working you'd see it in communication failures in the logs), I just don't think it helps, and the SCADA guy in me just defaults to "what is the slowest update that will get a good result".

[theflu]

I do feel like the internal sensor would be read in real time or polled X seconds. I also feel like there is some sort of logic to increase the output if its calling for heat and the temp isn't going up. I would be nice to have an actually Mitsubishi cn105 thermostat and log the tx/rx to see how it interacts with the unit.

[tmchow]

In the case of my mini split here the internal temp of the ESP01 board ends up reading something insane like 85F for some reason. Not sure if it's because I have the module inside the casing of the minisplit

[theflu]

When I said internal sensor I meant the sensor built into the mini split itself.

[CopperSubstrate]

In the case of my mini split here the internal temp of the ESP01 board ends up reading something insane like 85F for some reason. Not sure if it's because I have the module inside the casing of the minisplit

We have the same issue in most of our units, which is why I set up the remote sensors in the first place.

In a room that 62 F the unit itself will report something like 75 F.