Changing a decimal value into a hex value (jinja)

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!

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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 }}
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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.

1 Like

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'

This worked for me too. Seems strange that you have to specify the ‘value’ twice but it works…

{{ states('input_text.hs_wd200_leds') | int(states('input_text.hs_wd200_leds'), 2) }}