Template Sensor %

Configuration
1

Hi

I would like to rewrite below template sensor.

I would like to set if state is “off” 0.15

If state is “on” , 100% brigthness_pct = 10 , I want the sensor to calculate the watt based on the brigthness_pct?

The perfect setup would be if I could only add the max consumption and it would do the calculations for me based on the brigthness_pct?

  • platform: template
    sensors:
    watt_light_kjellerstue_1:
    unit_of_measurement: “W”
    value_template: >-
    {% if is_state(‘light.kjellerstue_1’, ‘on’) %}
    10
    {% else %}
    0.15
    {% endif %}
2

Brightness_pct can be used to set the brightness, but it’s not exposed as an attribute so you’d have to use brightness which is an integer from 1 to 255.

So basically if you’re saying that 100% (brightness 255) should equal 10, then presumably 50% should equal 5, so I think (in my slightly sleepy state) the formula would be to multiply the brightness level by 10 and divide by 255.

So…

- platform: template
  sensors:
    watt_light_kjellerstue_1:
      unit_of_measurement: "W"
      value_template: >-
        {% if is_state('light.kjellerstue_1', 'on') %}
          {{ (state_attr('light.kjellerstue_1', 'brightness')*10) / 255 }} 
        {% else %}
          0.15
        {% endif %}

I can’t work out off the top of my head whether that will always return a round number so you might need to round the decimal points in the output :man_shrugging:

Also if ‘10’ is a changeable number you could swap that out for the state of an input_number, and update the input number whenever you need to adjust the calculation.

Anyway, hopefully this gets you most, if not all, the way there.

3

Hi Mac
Thanks for your help, this was just what I needed :slight_smile:

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