Zigbee2mqtt: Is there any way to set the level of precision for temp/humidity sensors?

[mihalski]

I normally use one decimal point of precision for my temp/humidity sensors and I searched but could not find any way to do this with zigbee2mqtt.

I know I could manually do it in a Home Assistant template but this would prevent the use of MQTT auto-discovery.

Thanks in advance.

P.S. Oh and I set pressure to zero decimal points of precision (ie whole numbers).

[Koenkk]

Implemented, see documentation on how to use it.

[mihalski]

Thank you!

Would it also make sense to have a global config equivalent to the device specific config in the main section of the configuration.yaml for when you always want parameters measured with a particular level of precision (including all future sensors)?

[mihalski]

I also noticed that even with precision set to 1 if the value returned by the sensor happens to be a whole number it returns an int rather than a float (ie missing the .0)

[justmvg]

I've installed 1.0.0 yesterday and made changes to the configuration.yaml to set the precision to 1 decimal instead of the default of 2. Restarted zigbee2mqtt but still receiving data with 2 decimals.
Is there anything else I should change?

I have set temperature and humidity values to have 1 decimal for 2 devices.

[Koenkk]

@justmvg checkout the dev branch

[Koenkk]

• Precision for whole numbers is not possible in javascript (see https://www.w3schools.com/js/js_numbers.asp)
• Device type specific default can now be set via device_options (see https://github.com/Koenkk/zigbee2mqtt/blob/dev/docs/configuration/device_specific_configuration.md#changing-device-type-specific-defaults)

[justmvg]

@justmvg checkout the dev branch

Thank you. I managed to make it work with the dev branch.

[mihalski]

Thank you so much for implementing device type specific defaults!
Granted, I don't really know what I am talking about and this is based on a quick google search, but couldn't you just use .toFixed(precision) where precision is a variable containing the number of decimal points of precision desired?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed

[Koenkk]

The problem of toFixed is that it returns a string, the values should be kept numerical.

[mihalski]

Does it matter when the intended output is a JSON string? Internally it can be numerical, but when being reported as part of a MQTT JSON string it could be considered seperate.

[Koenkk]

I don't know, can home assistant still handle it? Does it automatically do the numeric conversion?

[mihalski]

My understanding of MQTT was that value types were inferred from the presentation of the JSON string. But I am about as far from an expert in the field as is possible.

[Koenkk]

Yes that's true, but this JSON string can contain textual and numerical values.

[mihalski]

I guess trying it and seeing what happens is the only ay to be sure. But as far as I understand it's all a string until context turns it into whatever type it needs to be.

[mateuszdrab]

Hey guys, I'm running the latest version of zigbee2mqtt and after adding the following, I'm still seeing the messages get sent with default precision settings.

device_options:
--temperature_precision: 1
--humidity_precision: 1
--pressure_precision: 1

The - represents space

Can't get it to format right in code format.

This is put right after the serial: section and before the devices: section.

What am I doing wrong?

[Koenkk]

@mateuszdrab are you using the dev branch?

[mateuszdrab]

@mateuszdrab are you using the dev branch?

I'm on master, makes sense. I can try that later, I need to open an issue for another matter as well.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[zerofruchtshake]

• Device type specific default can now be set via device_options (see https://github.com/Koenkk/zigbee2mqtt/blob/dev/docs/configuration/device_specific_configuration.md#changing-device-type-specific-defaults)

The link is not working any more :(

EDIT: Never mind, i'm stupid, found it..
EDIT2: Is there any way to change the default of all sensors at once?

[Koenkk]

@zerofruchtshake http://www.zigbee2mqtt.io/configuration/device_specific_configuration.html#changing-device-type-specific-defaults

[cigas4]

@zerofruchtshake http://www.zigbee2mqtt.io/configuration/device_specific_configuration.html#changing-device-type-specific-defaults

Where should I put this:

device_options:
occupancy_timeout: 130
temperature_precision: 1

If I put this to HA configuration.yaml, I get error "Component error: device_options - Integration device_options not found."

Also tried HA Configuration - > Customization -> Entitty: Humidity sensor -> add other attribute -> name: humidity_precision value: 1 -> Reboot
But this also does not work.

[KuChar91]

@zerofruchtshake http://www.zigbee2mqtt.io/configuration/device_specific_configuration.html#changing-device-type-specific-defaults

Where should I put this:

device_options:
occupancy_timeout: 130
temperature_precision: 1

If I put this to HA configuration.yaml, I get error "Component error: device_options - Integration device_options not found."

Also tried HA Configuration - > Customization -> Entitty: Humidity sensor -> add other attribute -> name: humidity_precision value: 1 -> Reboot
But this also does not work.

Put it in devices.yaml or configuration.yaml (add-on) not HA.