Changing a decimal value into a hex value (jinja)

Tags: #<Tag:0x00007f60113a5f20>


In the jinja template, I can do this:

{{ '%0x' % 255 }}

to convert 255 into hex ‘ff’

I’m trying to get the same with this value

{{ '%0x' % states.input_slider.mote_value_red }}

But it comes up empty, what am I doing wrong?


I find that I often need tell templates the type of the var. It’s possible that the state is a string. Run it through the “float” filter first and see if that helps!


Thanks I’ll give that a go!

I’ve just installed AppDaemon so I reckon I’ll try that out too.

Yaml is leaving me a little syntax’d out :wink:


Hi there

I have a similar issue - I am trying to create a RESTful sensor to give me a temperature sensor.

  • platform: rest
    name: Temperature
    value_template: '{{ “%+0x” | format([4:6] | int }}'
    unit_of_measurement: “°C”

The device returns the temperature in hexadecimal format. I then need to convert it to a decimal number.

I tried the above but it seems the json data is returned as a string and so the conversion fails. Typical data that is returned from the sensor is “1D” for 29 degrees Celcius. Would appreciate your assistance!


When you’re experimenting on this, remember that you can use the template dev tool to test your formatting.

{% set value = "VAL RETURNED BY SENSOR" %}
{{ "%+0x" | format( value | int }}


Hi, thanks for that. I actually didn’t realise that it was possible to test from within HASS!
The following worked for me:

{% set value = “VAL RETURNED BY SENSOR” %}
{{ value | int(value,16) }}


I was just parroting back the template you were using above. My point is that you can do a lot of testing with the template dev tool. Faster than rebooting each iteration.


First, thank you to everyone for sharing your thoughts. It has been helpful.

I’m working on pulling electricity demand from a Rainforest Eagle Energy Monitor API. I’ve been trying to work through a value template but can’t seem to figure it out. I’m trying to pull (hex) data from a rest api (that part works = 0x0001e6) and then convert the hex to an integer which does not work (- unknown). I sense i’m missing something but I cannot figure it out. Any thoughts?

  - platform: rest
    name: instant demand
    resource: http://192.168.###.###/cgi-bin/post_manager?Content-Type=application/x-www-form-urlencoded HTTP/1.1
    method: POST
    payload: '{ <Command><Name>get_instantaneous_demand</Name><MacId>#############</MacId><Format>JSON</Format>
</Command> }'
      Content-Type: application/x-www-form-urlencoded
    value_template: '{{ value_json["InstantaneousDemand"]["Demand"]}}'

  - platform: template
        value_template: '{{ (sensor.instant_demand) | int((sensor.instant_demand),16) }}'
        #value_template: '{{ value | int(value,16)}}'
        friendly_name: Energy Meter
        unit_of_measurement: 'kW'