Bad data from ESPHome when using deep sleep on ESP32

ESPHome
1

I am building an ESP32-based weather station, powered by a solar panel which charges an 18650 battery. To keep the unit running, I am trying to implement deep sleep to only publish data every 10 minutes or so.

I’ve got deep sleep working, but my only issue is that when the unit wakes of from deep sleep, the sensor data is skewed during every other reading - that is, it seems that deep sleep throws off the temperature sensor data. I am not sure how this is happening. I am using a BME280 for temperature, pressure, and humidity monitoring.

Here is the deep sleep unit temperature readings over a 12-hour period:

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Here is another sensor right next to it taking the same readings at the same interval, only without going into deep sleep:

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2

Maybe the one that is sleeping is not self-heating, as the BME280 is wont to do.

3

That makes sense. I could try isolating the sensor from the unit with a length of wire, but I have noticed I have the same issue with the voltage readings as well. I suppose this could also be a result of power on voltage changes.

Is there any way to average sensor readings over several deep sleep cycles?

4

The sensor that goes to sleep is not self heating. The one that is always awake is.

Ok, it’s probably something else then.

In home assistant, yes. In ESPHome, no.

5

Just an idea…
What would the data look like if the BME280 were always powered?

I’ve never used the BME280, ut according to the datasheet, it has a sleep mode. Is that available from the library?