I’m using Reimann Integrals to sum a few sensors, eg my MVHR airflows and I was hoping to be able to display yesterday’s total airflow using the Statistics card. I get just a question mark displayed.
As an example:
In configuration.yaml
Sensor:
- platform: integration
source: sensor.mvhr_exhaust_airflow
name: mvhr_exhaust_integral
unit_time: h
unique_id: mvhr_exhaust_integral
Which does indeed add up the cumulative airflow. However this lovelace card does not display yesterday’s total and clicking on it shows the current total but under History: “no statistics found”:
type: grid
title: Averages yesterday
cards:
- type: statistic
period:
calendar:
period: day
offset: -1
stat_type: change
entity: sensor.mvhr_exhaust_integral
name: Exhaust
Any idea what’s going on here?