example HomeAssistant package - propane_scale_fireplace.yaml

# Home Assistant interfacing for propane tank scale operation

# Selection for size of tank
input_select:
  fireplace_propane_tank_size:
    name: Fireplace Propane Tank Size
    options:
      - 20lb Tank
      - 40lb Tank
    initial: 40lb Tank
    icon: mdi:propane-tank-outline

# scale zero offset for calibration
input_number:
  fireplace_propane_scale_zero_offset:
    name: Fireplace Propane Scale Zero Offset
    min: -9
    max: 9
    step: 0.1
    unit_of_measurement: "lb" 


template:
  
  - sensor:

      # Sensor for scale zero weight offset
      - name: "Fireplace Propane Weight Corrected"
        unit_of_measurement: "lb"
        icon: "mdi:scale"
        device_class: "weight"
        state_class: "measurement"
        state: >
          {{ states('sensor.fireplace_propane_weight') | float(default="unknown") - states('input_number.fireplace_propane_scale_zero_offset') | float(default="unknown") }}

      # Sensor for tank empty weight
      - name: "Fireplace Propane Tank Empty Weight"
        unit_of_measurement: "lb"
        icon: "mdi:weight-pound"
        device_class: "weight"
        state_class: "measurement"
        state: >-
          {% if states('input_select.fireplace_propane_tank_size') == "20lb Tank" %}
          {# My actual tanks TW: 17.7, 18 #}
            18
          {% elif states('input_select.fireplace_propane_tank_size') == "40lb Tank" %}
          {# My actual tanks TW: 29.9, 31.3 #}
            31
          {% else %}
            unknown
          {% endif %}

      # Sensor for tank capacity
      - name: "Fireplace Propane Tank Fuel Capacity"
        unit_of_measurement: "lb"
        icon: "mdi:weight-pound"
        device_class: "weight"
        state_class: "measurement"
        state: >-
          {% if states('input_select.fireplace_propane_tank_size') == "20lb Tank" %}
            20
          {% elif states('input_select.fireplace_propane_tank_size') == "40lb Tank" %}
            40
          {% else %}
            unknown
          {% endif %}

      # Sensor for remaining fuel lb
      - name: "Fireplace Propane Fuel Remaining"
        unit_of_measurement: "lb"
        icon: >-
          {% set fuel = states('sensor.fireplace_propane_fuel_remaining') | float(default="unknown") %}
          {% set capacity = states('sensor.fireplace_propane_tank_fuel_capacity') | float(default="unknown") %}
          {# Verify data is numeric #}
          {% if fuel == "unknown" or capacity == "unknown" %}
            mdi:alert
          {% else %}
            {% set fuel_percent = (fuel/capacity)*100 %}
            {% if fuel <= 3 %}{# 3lb is empty, regardless of capacity #}
              mdi:gauge-empty
            {% elif fuel_percent > 60 %}{# "full" #}
              mdi:gauge-full
            {% elif fuel_percent > 30 %}{# "slightly over half" #}
              mdi:gauge
            {% elif fuel_percent <= 30 %}{# "slightly under half" #}
              mdi:gauge-low
            {% endif %}
          {% endif %}
        device_class: "weight"
        state_class: "measurement"
        state: >
          {{ states('sensor.fireplace_propane_weight_corrected') | float(default="unknown") - states('sensor.fireplace_propane_tank_empty_weight') | float(default="unknown") }}

      # Sensor for burn rate hourly
      - name: "Fireplace Propane Fuel Consumption Hourly"
        unit_of_measurement: "lb/hr"
        icon: "mdi:gas-burner" 
        device_class: "weight"
        state_class: "measurement"
        state: >
          {% set short_rate = -1 * (states('sensor.fireplace_propane_fuel_burn_rate_change_short_seconds') | float(default="unknown") * 3600) %}
          {% set long_rate = -1 * (states('sensor.fireplace_propane_fuel_burn_rate_change_long_seconds') | float(default="unknown") * 3600) %}
          {% set worst_rate = [short_rate,long_rate] | max | round(2,default="unknown") %}
          {% if worst_rate < 0 %}{# Burn rate can not be increasing #}
            {{ states("sensor.fireplace_propane_fuel_consumption_hourly") }}
          {% else %}
            {{ worst_rate }}
          {% endif %}

      # Sensor for burn rate daily
      - name: "Fireplace Propane Fuel Consumption Daily"
        unit_of_measurement: "lb/day"
        icon: "mdi:gas-burner" 
        device_class: "weight"
        state_class: "measurement"
        state: >
          {% set short_rate = -1 * (states('sensor.fireplace_propane_fuel_burn_rate_change_short_seconds') | float(default="unknown") * 3600 * 24) %}
          {% set long_rate = -1 * (states('sensor.fireplace_propane_fuel_burn_rate_change_long_seconds') | float(default="unknown") * 3600 * 24) %}
          {% set worst_rate = [short_rate,long_rate] | max | round(2,default="unknown") %}
          {% if worst_rate < 0 %}{# Burn rate can not be increasing #}
            {{ states("sensor.fireplace_propane_fuel_consumption_daily") }}
          {% else %}
            {{ worst_rate }}
          {% endif %}

      # Sensor for est days remaining
      - name: "Fireplace Propane Fuel Est Days Remaining"
        unit_of_measurement: "days"
        icon: "mdi:clock-outline" 
        state_class: "measurement"
        state: >
            {% set remain = states("sensor.fireplace_propane_fuel_remaining") | float(0) %}
            {% set rate = states("sensor.fireplace_propane_fuel_consumption_daily") | float(0) %}
            {% if rate <= 0 %}
              Off/Invalid
            {% else %}
              {{ (remain / rate) | int(0) }}
            {% endif %}

      # Sensor for est days remaining
      - name: "Fireplace Propane Weight Age"
        unit_of_measurement: "Seconds"
        state: >
          {{ (now() - states.sensor.fireplace_propane_weight.last_updated).total_seconds() | round(0,default=0) }}



sensor:

  - platform: statistics
    name: "Fireplace Propane Fuel Burn Rate Change Long Seconds"
    entity_id: sensor.fireplace_propane_fuel_remaining
    state_characteristic: change_second
    precision: 20
    sampling_size: 75
    max_age:
      hours: 24

  - platform: statistics
    name: "Fireplace Propane Fuel Burn Rate Change Short Seconds"
    entity_id: sensor.fireplace_propane_fuel_remaining
    state_characteristic: change_second
    precision: 20
    sampling_size: 25
    max_age:
      hours: 3



automation:

  # Automation to force-sleep immediately after value update
  - alias: "Deep Sleep ESPHome fireplace_propane"
    trigger:
      - platform: state
        entity_id:
          - sensor.fireplace_propane_weight
    # Condition to skip if scale appears to be empty
    condition:
      condition: numeric_state
      entity_id: sensor.fireplace_propane_weight
      above: 10
    action:
      - delay: "00:00:01"
      - service: switch.turn_on
        entity_id: switch.fireplace_propane_deep_sleep_now

  # Automation to auto-zero scale input_number when empty
  - alias: "Auto Zero fireplace_propane empty-scale offset"
    trigger:
      - platform: state
        entity_id:
          - sensor.fireplace_propane_weight
    # Condition only if scale appears to be empty
    condition:
      condition: numeric_state
      entity_id: sensor.fireplace_propane_weight
      below: 9
      above: -9
    action:
      service: input_number.set_value
      data:
        entity_id: input_number.fireplace_propane_scale_zero_offset
        value: >-
          {{ states('sensor.fireplace_propane_weight') | float(default="unknown") }}

  # Automation to auto-change tank size by weight
  - alias: "Auto Change fireplace_propane tank size selection"
    trigger:
      - platform: numeric_state
        entity_id: sensor.fireplace_propane_weight_corrected
        below: 25
        above: 10
      - platform: numeric_state
        entity_id: sensor.fireplace_propane_weight_corrected
        above: 40
    # Condition only if scale appears to be empty
    condition:
      condition: numeric_state
      entity_id: sensor.fireplace_propane_weight_corrected
      above: 10
    action:
      service: input_select.select_option
      data:
        entity_id: input_select.fireplace_propane_tank_size
        option: >-
          {% set weight = states('sensor.fireplace_propane_weight_corrected') | float(default="unknown") %}
          {% if weight > 40 %} {# If too high, must be bigger tank #}
            40lb Tank
          {% elif weight < 25 and weight > 10 %}{# If not empty and too low, must be small tank #}
            20lb Tank
          {% else %}
            Unknown
          {% endif %}