AM2301+Tasmota - No history for humidity

[sciurius]

Hi,

I have a NodeMCU running Tasmota 11 with a AM2301 (DHT22) connected to it. The devices are correctly picked up by the Tasmota Autodiscovery plugin.
Values are shown correctly, but Domoticz does not keep a history for the humidity readings. Do I need to change a setting?

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scrot20220218081617.png (21.42 KiB) Viewed 1003 times

[waltervl]

Standard Humidity device keeps track of Humidity but it looks like the plugin uses something else.
A humidity sensor also needs an indication of the status (normal, wet, dry etc) so it needs 2 parameters. This status then needs to be calculated by the plugin.
So discuss this with the plugin owner.

As a reference check
https://www.domoticz.com/wiki/Dummy_for ... s#Humidity
https://www.domoticz.com/wiki/Domoticz_ ... s#Humidity and
https://www.domoticz.com/wiki/Developin ... #Devices_2

[joba1]

Hi,

I‘m the plugin author and just looked into this.
Technically it is no problem to send a humidity description.

But I have no idea which percentages should be translated to which description.

Any suggestions?

[waltervl]

Hi,

I‘m the plugin author and just looked into this.
Technically it is no problem to send a humidity description.

But I have no idea which percentages should be translated to which description.

Any suggestions?

This is how it is calculated in DzVents

Code: Select all

function self.humidityStatus (temperature, humidity)
	local constants = domoticz or require('constants')
	local temperature = tonumber(temperature)
	local humidity = tonumber(humidity)

	if humidity <= 30 then return constants.HUM_DRY
	elseif humidity >= 70 then return constants.HUM_WET
	elseif  humidity >= 35 and
			humidity <= 65 and
			temperature >= 22 and
			temperature <= 26 then return constants.HUM_COMFORTABLE
	else return constants.HUM_NORMAL end
end

[sciurius]

While on the topic: The docs say that the humidty value is a "PERCENTAGE (may be > 100)" but it doesn't say whether it is an integer or a float value. It seems that float values are rounded (truncated?) to integers, so no decimal precision. Is this intentional?

[waltervl]

Perhaps, the developers are not always updating the documentation. So you sometimes have to find it out by experimenting or check the source code.
You could also check the database with an SQLite browser to see what is stored.

[sciurius]

Well, column HUMIDITY in table TEMPERATURE is of type INTEGER, so that settles it...