How to split a sensor into positive and negative sensors

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1

How to split a sensor that shows positive and negative values into two sensors, one for positive values one for negative values. This is particularly useful for power sensors:

template:
  - sensor:  
      - name: Grid Power In
        unit_of_measurement: Wh
        device_class: power
        state_class: measurement
        state: >
          {% if states('sensor.grid_power') | float(0) >= 0 %}
            {{ states('sensor.grid_power') | float(0) }}
          {% else %}
            0
          {% endif %}
        availability: "{{ has_value('sensor.grid_power') }}"

      - name: Grid Power Out
        unit_of_measurement: Wh
        device_class: power
        state_class: measurement
        state: >
          {% if states('sensor.grid_power') | float(0) <= 0 %}
            {{ states('sensor.grid_power') |float | abs }}
          {% else %}
            0
          {% endif %}
        availability: "{{ has_value('sensor.grid_power') }}"

The Home Assistant Cookbook - Index.

5 Likes
2

If you prefer to use the UI, the template helper can be used.

1000015326
10000153261008Ă—1998 159 KB

If no conversation math is required the filter helper can be used.

1000015325
10000153251008Ă—1672 85.5 KB

3

yes, or max:

      - unique_id: saldo_totaal_dag_energie_afname
        state: >
          {% set saldo = states('sensor.grid_energy_total')|float(0) %}
          {{[0,saldo]|max}}

power:

 {% set power = states('sensor.netto_verbruik')|int 
 {{[0,power]|min|abs}} # use `abs` to turn the negative power, return to grid, into a positive,

 {{[0,power]|max}}

sweet. I had played around with the filter before, but somehow got the impression it took more from the system than the simple template using min/max/abs

could have been imagination…