Hi Community.
I’ll start with Platform information:
- Hardware: Raspberry Pi 3
- OS: Openhabian on Raspbian 10
- Java Runtime Environment: openJDK 11
- openHAB version: 3.3.0 release
I’m having a strange issue with Averages for temperatues not being calculated correctly in some cases. My setup is as follows:
- 2 Max! Thermostats, 2 Items for the SET_TEMPERATURE channels of both called thermostat1_SetTemperature and thermostat2_SetTemperature respectively; type is set to Number:Temperature
- a group wohnzimmer_thermostate_wunschtemperatur containing both items with Member Base Type set to Number:Temperature and group function to AVG
Please see the following log-output when I change the SetTemperatures on the thermostats by sending a command with the target temperature to the group item:
// command gets sent to both items when sending the command to the group
2022-12-06 16:31:37.241 [INFO ] [openhab.event.ItemCommandEvent ] - Item 'thermostat2_SetTemperature' received command 19.5 °C
2022-12-06 16:31:37.249 [INFO ] [openhab.event.ItemCommandEvent ] - Item 'thermostat1_SetTemperature' received command 19.5 °C
// expected value of both SetTemperatures is 19.5 °C
2022-12-06 16:31:37.289 [INFO ] [penhab.event.ItemStatePredictedEvent] - Item 'thermostat2_SetTemperature' predicted to become 19.5 °C
2022-12-06 16:31:37.316 [INFO ] [penhab.event.ItemStatePredictedEvent] - Item 'thermostat1_SetTemperature' predicted to become 19.5 °C
// the change happens for the first of both Thermostats
2022-12-06 16:31:37.351 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'thermostat2_SetTemperature' changed from 19 °C to 19.5 °C
// group average gets correctly updated to (19 °C + 19.5°C) / 2 (rounded to one decimal place for some reason)
2022-12-06 16:31:37.355 [INFO ] [hab.event.GroupItemStateChangedEvent] - Item 'wohnzimmer_thermostate_wunschtemperatur' changed from 19 °C to 19.3 °C through thermostat2_SetTemperature
// second change happens
2022-12-06 16:31:37.359 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'thermostat1_SetTemperature' changed from 19 °C to 19.5 °C
// HERE IS THE ISSUE
// both items have a value of 19.5 °C now - but the average is 20 °C for some reason
2022-12-06 16:31:37.407 [INFO ] [hab.event.GroupItemStateChangedEvent] - Item 'wohnzimmer_thermostate_wunschtemperatur' changed from 19.3 °C to 20 °C through thermostat1_SetTemperature
// here I'm going back to 19 °C and the group average is correctly at 19 °C afterwards
2022-12-06 16:31:38.467 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'thermostat1_SetTemperature' changed from 19.5 °C to 19 °C
2022-12-06 16:31:38.476 [INFO ] [hab.event.GroupItemStateChangedEvent] - Item 'wohnzimmer_thermostate_wunschtemperatur' changed from 20 °C to 19.3 °C through thermostat1_SetTemperature
2022-12-06 16:31:39.768 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'thermostat2_SetTemperature' changed from 19.5 °C to 19 °C
2022-12-06 16:31:39.776 [INFO ] [hab.event.GroupItemStateChangedEvent] - Item 'wohnzimmer_thermostate_wunschtemperatur' changed from 19.3 °C to 19 °C through thermostat2_SetTemperature
I read through a lot of stuff regarding dimensions and types and so on, but all values seem to be correct and the SetTemperature shown on the display of the Thermostats is also correct. I don’t know where to look next.
Thanks for any help or hints you may have.
Steffen