Convert celsius to fahrenheit

[fahmed12 (Fahd)]

have following MQTT broker data

/sensor/main//HUM/add111 {“Temperature”:23.22,“Humidity”:46.7,“created_at”:“2022-06-22T17:04:10.5833725Z”,“VersionInfo”:1.0,“ModuleType”:“HUM”,“value”:“46.7”,“Address”:111,“Name”:""}

How do I convert this to fahrenheit for display. Right now its showing celsius in OH

Thank you
Fahd

[rlkoshak (Rich Koshak)]

You’re missing a whole lot. You’ve shown us the raw message and jumped straight to how to see it on your UI. There’s a ton of stuff between those two points.

What’s your Thing/Channel config?
What’s your Item config?
What’s your UI config?

[fahmed12 (Fahd)]

[fahmed12 (Fahd)]

Hopefully this helps

[rlkoshak (Rich Koshak)]

Sadly not really. Screen shots are terrible. Please click on the code tab for the Thing and paste in the code you see there. Use code fences:

```
code goes here
```

Why use a String Item?

Create the Channel as a number Channel (all the configs you’ve already done will probably be the same.

One additional setting you’ll have is “Unit of Measurement”. Put °C there.

Recreate the Item as a Number:Temperature Item.

Click on “Add Metadata” and add “State Description”. In the “Pattern” section put in %.1f °F. That tells MainUI to convert the °C to °F (with one decimal place) in most places it’s shown in the UI.

[fahmed12 (Fahd)]

Completed all the steps you mentioned. Still showing Celsius

[fahmed12 (Fahd)]

UID: mqtt:topic:a618b11e4c:57e0706733
label: CC2356
thingTypeUID: mqtt:topic
configuration: {}
bridgeUID: mqtt:broker:a618b11e4c
location: CC2356
channels:
  - id: CC2356_C02
    channelTypeUID: mqtt:string
    label: CC2356_C02
    description: ""
    configuration:
      stateTopic: /sensor/main//CO2/add105
      transformationPattern: JSONPATH:$.value
  - id: CC2356_Humidity
    channelTypeUID: mqtt:string
    label: CC2356_Humidity
    description: ""
    configuration:
      stateTopic: /sensor/main//HUM/add111
      transformationPattern: JSONPATH:$.Humidity
  - id: CC2356_Temp
    channelTypeUID: mqtt:number
    label: CC2356_Temp
    description: ""
    configuration:
      stateTopic: /sensor/main//HUM/add111
      transformationPattern: "JSONPATH:$.Temperature "
      unit: °C

[fahmed12 (Fahd)]

[rossko57]

@fahmed12

unit: °C

This has no effect on incoming MQTT data in older versions. Your OH version?

[fahmed12 (Fahd)]

[fahmed12 (Fahd)]

This is command I used

apt-cache policy openhab

[rlkoshak (Rich Koshak)]

I think @rossko57 is on to something. I don’t think that fix existed in OH 3.2 release.

So you can either upgrade to the latest milestone, wait a couple weeks for 3.3 to be released, or deal with this using a JS transformation that converts the °C to °F before it gets to the Item.

[fahmed12 (Fahd)]

How would I use a JS transformation? just for learning purpose.

[rlkoshak (Rich Koshak)]

Start here Transformations | openHAB

Then here JavaScript - Transformation Services | openHAB

Then here Items | openHAB

[fahmed12 (Fahd)]

Thank you for sharing, was able to get it to work with JS transformation