Help with a template sensor that sets a number based on values between two numbers

Configuration
1

I’m trying to determine the speed of my ceiling fan by monitoring the power usage. I’ve got three different values so I’m trying to make a template sensor that gives me either a 1, 2 or 3 based on a true/false between two values. Ive tested the code below and it works but I don’t know how to turn that into a {%- if is_state('sensor... statement.

"{{ (states.sensor.bedroom_fan_shelly_power.state | float > 4 ) and (states.sensor.bedroom_fan_shelly_power.state | float < 5 ) }}'

I want to do something like this but of course, I have the syntax completely wrong.

    value_template: >-
     {%- if is_state("sensor.bedroom_fan_shelly_power", ">4") and ("sensor.bedroom_fan_shelly_power", "<5")%}
       1
     {%- elif is_state("sensor.bedroom_fan_shelly_power", ">6") and ("sensor.bedroom_fan_shelly_power", "<7")%}
       2
     {%- elif is_state("sensor.bedroom_fan_shelly_power", ">8") and ("sensor.bedroom_fan_shelly_power", "<9")%}
       3
     {%- else -%}
        Off
     {%- endif %}
1 Like
2

Making some progress but only reports ‘1’ despite the value changing to between the other numbers.

    value_template: >-
     {% if states('sensor.bedroom_fan_shelly_power') | float >3 and ('sensor.bedroom_fan_shelly_power') | float <5.5 %}
       1
     {%- elif is_state('sensor.bedroom_fan_shelly_power') | float >6 and ('sensor.bedroom_fan_shelly_power') | float <8 %}
       2
     {%- elif is_state('sensor.bedroom_fan_shelly_power') | float >8 and ('sensor.bedroom_fan_shelly_power') | float <10 %}
       3
     {%- else -%}
        Off
     {%- endif %}
3

You are missing states() in the second part of your templates. And is_state is in a few places where states should be used. Try:

    value_template: >-
     {% if states('sensor.bedroom_fan_shelly_power') | float > 3 and states('sensor.bedroom_fan_shelly_power') | float < 5.5 %}
       1
     {% elif states('sensor.bedroom_fan_shelly_power') | float > 6 and states('sensor.bedroom_fan_shelly_power') | float < 8 %}
       2
     {% elif states('sensor.bedroom_fan_shelly_power') | float > 8 and states('sensor.bedroom_fan_shelly_power') | float < 10 %}
       3
     {% else %}
       Off
     {%- endif %}

You can make it a bit more human readable by doing this:

    value_template: >-
     {% set fan_power = states('sensor.bedroom_fan_shelly_power') | float %}

     {% if fan_power > 3 and fan_power < 5.5 %}
       1
     {% elif fan_power > 6 and fan_power < 8 %}
       2
     {% elif fan_power > 8 and fan_power < 10 %}
       3
     {% else %}
       Off
     {% endif %}

Simplifying further:

    value_template: >-
     {% set fan_power = states('sensor.bedroom_fan_shelly_power') | float %}

     {% if 3 < fan_power < 5.5 %}
       1
     {% elif 6 < fan_power < 8 %}
       2
     {% elif 8 < fan_power < 10 %}
       3
     {% else %}
       Off
     {% endif %}

This would be a safer set of values (no chance of 5.6 or 10.1 being reported as ‘Off’):

    value_template: >-
     {% set fan_power = states('sensor.bedroom_fan_shelly_power') | float %}

     {% if 3 < fan_power < 6 %}
       1
     {% elif 6 <= fan_power < 8 %}
       2
     {% elif fan_power >= 8 %}
       3
     {% else %}
       Off
     {% endif %}
8 Likes
4

Whoa! Yet again, mind blown. Wish I had the ability to figure all that out. Last one works a treat thank you. I just have to figure out why when I use the scripts defined in the fan template I get a different setting than if I use the direct broadlink switches for the three fan speeds.

The broadlink fan speed switches give me +/- 1 watt consumption levels increasing as the fan speed does (obviously) but for some strange reason, the speed script in the fan template yields intermittent results.

5

Seems the code I used to define speed was not correct. I have the following now and it’s working flawlessly.

  master_fan_set_speed:
    alias: Master Fan Set Speed
    sequence:
    - service: input_select.select_option
      data_template:
        entity_id: input_select.master_fan_set_speed
        option: '{{speed}}'
    - service: script.turn_on
      data_template:
        entity_id: >-
          {% if speed | string == "1"  %}
            script.bedroom_fan_1
          {% elif speed | string == "2" %}
            script.bedroom_fan_2
          {% elif speed | string == "3" %}
            script.bedroom_fan_3
          {% endif %}
6

This is where service templates are useful (scripts are services).

service_template: >
  {% if speed | string == "1"  %}
    script.bedroom_fan_1
  {% elif speed | string == "2" %}
    script.bedroom_fan_2
  {% elif speed | string == "3" %}
    script.bedroom_fan_3
  {% endif %}
7 
service_template: "script.bedroom_fan_{{speed | string}}"

For the value_template, if you don’t mind the fan_power being like this:

< 3 is off
>= 3 and < 6 is 1
>= 6 and < 9 is 2
>= 9 is 3

then you can achieve it using arithmetic:

    value_template: >-
     {% set fan_power = ((states('sensor.bedroom_fan_shelly_power') | float) // 3) | int %}
     {{ fan_power if fan_power > 0 else 'off' }}
2 Likes