DHT11 + D1mini/Tasmota/Sonoff + HABPanel Widget + Value Transformation

Setup, Configuration and Use Beginners
1

Trying to get a D1-Mini working with a DHT11 temperature/humididty sensor to send info to openhab and display on the HABPanel correctly.

I am able to send the info from the DHT11 to open hab and I can see it in the logs coming in, however on HABPanel it is not easy to read and I cannot figure out how to transform the incoming data to just display temperature or humidity.

For example, I added a “Selection” widget (only one I could get to do anything) and it displays
{“Time”:“2019-08-06T18:02:19”,“DHT11”:{“Temperature”:26.0,“Humidity”:64.0},“TempUnit”:“C”}

How do I get this to just display the current Temperature and Humidity only? Is this done via Value Transformation?

aoOvSVj.png1496×698

2

depends on your JSON format
if using tasmota it should be something like

JSONPATH:$.BME280.Temperature

search for name of your sensor in mqtt message
and you need two channels, one for humidity and one for temperature

I have for example three

Channels:
    Type number : temperature   "Temperature"   [ stateTopic="home/diningroom/climate/tele/SENSOR", transformationPattern="JSONPATH:$.BME280.Temperature" ]
    Type number : humidity      "Humidity"      [ stateTopic="home/diningroom/climate/tele/SENSOR", transformationPattern="JSONPATH:$.BME280.Humidity" ]
    Type number : pressure      "Pressure"      [ stateTopic="home/diningroom/climate/tele/SENSOR", transformationPattern="JSONPATH:$.BME280.Pressure" ]
3

I have tried the following in the field “Incoming value transformation” with errors.

JSONPATH:$.BME280.Temperature
JSONPATH:$.DHT11.Temperature
JSONPATH:$.barnrelay1.Temperature

All kick back the same error from the log of openhab

Transformation service JSONPATH for pattern $.BME280.Temperature not found!
Transformation service JSONPATH for pattern $.DHT11.Temperature not found!
Transformation service JSONPATH for pattern $.barnrelay1.Temperature not found!

On the console of my d1 mini I see this.

00:00:05 MQT: Connected
00:00:05 MQT: tele/barnrelay1/LWT = Online (retained)
00:00:05 MQT: cmnd/barnrelay1/POWER =
00:00:05 MQT: tele/barnrelay1/INFO1 = {“Module”:“Generic”,“Version”:“6.6.0(release-sonoff)”,“FallbackTopic”:“cmnd/barnrelay1_fb/”,“GroupTopic”:“sonoffs”}
00:00:05 MQT: tele/barnrelay1/INFO2 = {“WebServerMode”:“Admin”,“Hostname”:“barnrelay1-2228”,“IPAddress”:“10.1.5.16”}
00:00:05 MQT: tele/barnrelay1/INFO3 = {“RestartReason”:“Software/System restart”}
19:15:09 MQT: tele/barnrelay1/STATE = {“Time”:“2019-08-06T19:15:09”,“Uptime”:“0T00:00:16”,“Heap”:15,“SleepMode”:“Dynamic”,“Sleep”:50,“LoadAvg”:23,“Wifi”:{“AP”:1,“SSId”:“AP1”,“BSSId”:“84:16:F9:C8:D8:0C”,“Channel”:11,“RSSI”:38,“LinkCount”:1,“Downtime”:“0T00:00:04”}}
19:15:09 MQT: tele/barnrelay1/SENSOR = {“Time”:“2019-08-06T19:15:09”,“DHT11”:{“Temperature”:27.0,“Humidity”:61.0},“TempUnit”:“C”}

4

means you have prefix DHT11
just do

JSONPATH:$.DHT11.Temperature

means you don’t have Json transformation installed, go to your PaperUI → Addons → Transformations and install it

1 Like
5

ok here is what I get with that from the openhab Log file.

==> /var/log/openhab2/openhab.log <==
2019-08-06 14:26:39.881 [WARN ] [l.generic.ChannelStateTransformation] - Transformation service JSONPATH for pattern $.DHT11.Temperature not found!

I am missing something I think, but not sure what.

Screenshot of the channel config

6

Ok installed tranformations and set the config. All working now.
On to converting from Celsius to Farenheit somehow. :slight_smile:

7

well, it’s already built in tasmota

do not reinvent the weel :wink:

SetOption8	Show temperature in
0= Celsius (default)
1 = Fahrenheit
8

Well that was easy, thanks. Now its in Fahrenheit!!