Pressure Units

[Peter847]

I am running Home Assistant on a HyperV instance where it talks to three Hubitat C7 hubs. I have a pressure sensor in one of the hubs that reads in Pascals eg 158Pa but when it is displayed in Home Assistant it shows as x100 that value eg 15,800Pa. I have changed the units in HA to Hecto Pascals (hPa) and now the numeric value is correct but, of course, the units are wrong.

Here is the start of the DeviceID using the Hubitat Maker API call:

{
"id": "123",
"name": "Shelly Plus 1 Test",
"label": "0 - Furnace Room - Furnace Power",
"type": "Shelly Plus 1 v1",
"room": "0 - Furnace Room",
"attributes": [
{
"name": "pressure",
"currentValue": 157.88,
"dataType": "NUMBER"
},

and a cut and paste from the HA Sensor Card for the device:

Pressure 157.88 hPa

Is there a way to correct the numeric vale and/or the units?

[jason0x43]

What does the complete device information look like? Specifically, what does it report, if anything, for units?

Also, can you enable debug logging and grab a pressure change event from the log? It will look something like this:

2024-08-12 15:27:49.377 DEBUG (MainThread) [custom_components.hubitat.hubitatmaker.hub] Received event: {'name': 'speed', 'value': 'low', 'displayName': 'Virtual Fan', 'deviceId': '19', 'descriptionText': 'Virtual Fan fan speed set to low', 'unit': None, 'type': None, 'data': None}

I'm curious to see what units Hubitat is reporting for the sensor in update events.

By default the integration uses millibars for a sensor's native units, so if it's not being updated by the sensor config, HA thinks whatever value it's getting from Hubitat is millibars. When HA is told to display the sensor in Pa, it will multiply it by 100 to get Pa from millibars.

[jason0x43]

Oooo, I think I see where the problem is. The integration does not appear to be paying attention to units in events.

[jason0x43]

I just released v0.9.33 with support for custom pressure units -- give that a try.

[Peter847]

Apologies for the delayed response, I have been travelling. I updated to v0.9.33 and changed the units from hPa to Pa and HA still displays the pressure as x100 of what it should be, ie 4,700Pa when the hub is sending 47Pa. Here are the debug log lines:

2024-09-14 07:55:36.781 DEBUG (MainThread) [custom_components.hubitat.hubitatmaker.hub] Received event: {'name': 'pressure', 'value': '47', 'displayName': '0 - Furnace - Furnace Power', 'deviceId': '106', 'descriptionText': None, 'unit': 'Pa', 'type': None, 'data': None}
2024-09-14 07:55:36.781 DEBUG (MainThread) [custom_components.hubitat.hubitatmaker.hub] Updating pressure of 106 to 47 (Pa)

[jason0x43]

Try v0.9.34 when you get a chance. It fixes a potential issue with how units are handled and also includes some additional logging statements to help diagnose what might be going wrong.

[Peter847]

That worked! Many thanks for fixing it