low-battery-detection-notification.yaml

blueprint:
  domain: automation
  name: Low battery detection & notification for all battery sensors
  description: >-
    Regularly test all sensors with 'battery' device-class for crossing
    a certain battery level threshold and if so execute an action.

    ***Blueprint Revision:*** *7 / 2023-01-04*
  source_url: https://gist.github.com/itn3rd77/2cc639b6b903844e03bf6b58f2959795
  input:
    threshold:
      name: Battery warning level threshold
      description: Battery sensors below threshold are assumed to be low-battery (as
        well as binary battery sensors with value 'on').
      default: 20
      selector:
        number:
          min: 5.0
          max: 100.0
          unit_of_measurement: '%'
          mode: slider
          step: 5.0
    time:
      name: Time to run detection on
      description: 'Detection is run at configured time'
      default: '18:00:00'
      selector:
        time: {}
    weekday:
      name: Weekday(s) to run detection on
      description: 'Detection is run at configured time on the selected weekday(s)'
      default:
        - mon
        - tue
        - wed
        - thu
        - fri
        - sat
        - sun
      selector:
        select:
          custom_value: false
          mode: dropdown
          multiple: true
          options:
            - label: Monday
              value: mon
            - label: Tuesday
              value: tue
            - label: Wednesday
              value: wed
            - label: Thursday
              value: thu
            - label: Friday
              value: fri
            - label: Saturday
              value: sat
            - label: Sunday
              value: sun
    exclude:
      name: Excluded sensors (optional)
      description: Battery sensors (e.g. smartphone) to exclude from detection.
      default: []
      selector:
        entity:
          device_class: battery
          multiple: true
    bullet:
      name: Bullet point icon
      description: 'Bullet point icon to list detected battery sensors'
      default: '⦿'
      selector:
        text:
    message:
      name: Detection message
      description: | 
        Detection message shown for a detected low battery sensor.
        The message can be freely formatted and supports the following placeholders:

        [% bullet %] - is replaced with the choosen bullet point icon
        [% sensor %] - is replaced with the name of the sensor
        [% state %]  - is replaced with the battery state in percent ('0' for binary sensors)
        [% area %]   - is replaced by the area (Unknown if sensor has no area)
      default: '[% bullet %] [% sensor %] ([% state %]%) in area [% area %]'
      selector:
        text:
    order:
      name: Sorting of messages
      description: |
        Sorting of messages is posible by the following criteria:

        Alphabetical   - sort alphabetical by battery sensor name
        Battery charge - sort by battery charge
        Area           - sort by area
      default: 'name'
      selector:
        select:
          custom_value: false
          mode: dropdown
          multiple: false
          options:
          - label: Alphabetical
            value: name
          - label: Battery charge
            value: state
          - label: Area
            value: area
    actions:
      name: Actions
      description: Notifications or similar to be run. {{sensors}} is replaced with
        the names of sensors being low on battery and {{threshold}} is replaced with the threshold warning value.
      selector:
        action: {}
variables:
  weekday: !input weekday
  threshold: !input threshold
  exclude: !input exclude
  bullet: !input bullet
  message: !input message
  order: !input order
  sensors: "{% set result = namespace(sensors=[]) %}
            {% for sensor in states.sensor
                | rejectattr('entity_id', 'in', exclude)
                | rejectattr('attributes.device_class', 'undefined')
                | selectattr('attributes.device_class', '==', 'battery') %}  
                {% if 0 <= sensor.state | int(-1) < threshold | int %}
                    {% set area_name = area_name(sensor.entity_id) %} {% if area_name == None %} {% set area_name = 'Unknown' %} {% endif %}
                    {% set result.sensors = result.sensors + [dict(name = state_attr(sensor.entity_id, 'friendly_name').split('battery')[0].split('Battery')[0].strip(), state = sensor.state | int, area = area_name)]  %}
                {% endif %}
            {% endfor %} 
            {% for sensor in states.binary_sensor
                | rejectattr('entity_id', 'in', exclude)
                | rejectattr('attributes.device_class', 'undefined')          
                | selectattr('attributes.device_class', '==', 'battery')
                | selectattr('state', '==', 'on') %}
                {% set area_name = area_name(sensor.entity_id) %} {% if area_name == None %} {% set area_name = 'Unknown' %} {% endif %}
                {% set result.sensors = result.sensors + [dict(name = state_attr(sensor.entity_id, 'friendly_name').split('battery')[0].split('Battery')[0].strip(), state = 0 | int, area = area_name)] %}
            {% endfor %}
            {% set sensors = result.sensors | sort(attribute=order) %}
            {% set ns = namespace(sensors ='') %}
            {% for sensor in sensors  %}
                {% set ns.sensors  = ns.sensors + (message
                     | replace('[% bullet %]', bullet)
                     | replace('[% sensor %]', sensor.name)
                     | replace('[% state %]', sensor.state)
                     | replace('[% area %]', sensor.area) ~ '\n') %}
            {% endfor %}
            {{ns.sensors}}"
trigger:
- platform: time
  at: !input time
condition:
  condition: and
  conditions:
    - '{{ sensors | length > 1 }}'
    - condition: time
      weekday: !input weekday
action:
  !input actions
mode: single

Modify to allow for optional cron schedule instead of set time