Choose Lovelace Entity

Configuration
1

I built a scale to monitor propane tanks but i have two different size bottles, so i made two different sensors:

- platform: template
  sensors:
    propane_large:
      friendly_name: "Propane Green"
      unit_of_measurement: 'gal'
      value_template: >-
        {% set w = states('sensor.propane') | float %}
        {{ ((w - 23.3) / 4.25) | round(2) }}
- platform: template
  sensors:
    propane_bu:
      friendly_name: "Propane Blue"
      unit_of_measurement: 'gal'
      value_template: >-
        {% set w = states('sensor.propane') | float %}
        {{ ((w - 16.6) / 4.25) | round(2) }}

I want to display one or the other in Lovelace depending on which is currently on the scale, but i am lost at this point.

2

For posterity or whatever, here’s what i ended up doing. (The tanks are color coded as i expect different tare weights to come along if i fail to allow for them. I have red and yellow paint ready in case.):

#/config/template_sensors.yaml

# Propane
- platform: template
  sensors:
    propane_gn:
      friendly_name: "Propane Green"
      unit_of_measurement: 'gal'
      value_template: >-
        {% set w = states('sensor.propane') | float %}
        {{ ((w - 23.3) / 4.25) | round(2) }}
- platform: template
  sensors:
    propane_bu:
      friendly_name: "Propane Blue"
      unit_of_measurement: 'gal'
      value_template: >-
        {% set w = states('sensor.propane') | float %}
        {{ ((w - 16.6) / 4.25) | round(2) }}
# Select propane tank on scale
- platform: template
  sensors:
    propane_display:
      friendly_name: "Propane Tank"
      unit_of_measurement: 'gal'
      value_template: >-
        {% if is_state('input_select.tank_on_scale', 'Propane Green') %}
        {{ states('sensor.propane_gn') }}
        {% elif is_state('input_select.tank_on_scale', 'Propane Blue') %}
        {{ states('sensor.propane_bu') }}
        {% else %}
        Unknown Tank
        {% endif %}


#/config/input_select.yaml

propane_tank:
  name: Propane Select
  options:
    - Propane Green
    - Propane Blue
  initial: Propane Blue
  icon: mdi:gas-cylinder

Lovelace selection:

type: custom:select-list-card
entity: input_select.propane_tank
icon: mdi:gas-cylinder
truncate: false
show_toggle: false
scroll_to_selected: true
max_options: 2

Lovelace display:

type: entity
entity: sensor.propane_display

This stuff is not noob friendly. I mean i was proud myself for building this thing from a thrift shop scale and a ESP8266 but then Home Assistant kicked my butt and told me i am stupid. I’m still not entirely clear what i’ve done but it works.

Next i think i’ll see abt RFID tags on the tanks instead of paint, so they can select automatically…