Add Custom Sensor to existing Device

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Hello everyone,

I bought a Tuya socket with consumption measurement. It works, but the power information is in the attributes and not as separate sensors. I have created sensors for the information I need. However, these are “deviceless” and only exist as entities. Is it possible to add sensors to existing devices, similar to how the BatteryNotes integration does it?

2024-02-21 12_17_09-Clipboard
2024-02-21 12_17_09-Clipboard767×756 58.5 KB

The socket is controlled via LocalTuya.
Sensor Code:

  - platform: template
    sensors:
      waschmaschine_power:
        friendly_name: "Waschmaschine Stromverbrauch"
        unique_id: "waschmaschine_power"
        entity_id: switch.waschmaschine
        value_template: "{{ state_attr('switch.waschmaschine', 'current_consumption') }}"
        unit_of_measurement: 'W'
        #device_class: apparent_power
      waschmaschine_status:
        friendly_name: "Waschmaschine Status"
        unique_id: "waschmaschine_status"
        value_template: >-
          {% set power = states('sensor.waschmaschine_power')|float %}
          {% if power == 0 %}
            aus
          {% elif power > 1 and power < 10 %}
            wartend
          {% elif power > 10 %}
            läuft
          {% endif %}
1 Like
2

There’s a HACS integration that does this, but it’s still in the early stages, so use with care. I haven’t tried adding a sensor to an existing device, but I’ve used it to create “virtual devices” to group template sensors in the UI - that works well.

Edit: To get a template sensor to appear in the UI you have to assign it a unique id - for example:

  - sensor:
      - name: "Roof space battery level"
        unit_of_measurement: "%"
        unique_id: 763dbfbd-73e1-41b0-9404-2c4acf2b14bd
        state: '{{ state_attr("binary_sensor.roof_space_low_battery", "battery_level") | float(0) }}'
        device_class: battery

I’ve been getting my unique ids from here:

2 Likes