Binary Sensor from School Calendar

Configuration
1

I have a calendar, calendar.town_schools, in Home Assistant. Every event on the calendar is an all day event lasting one or more days. For the purposes of this sensor, I only care about events with the titles:

  • No School
  • Last Day of School
  • First Day of School

I want a school_day binary sensor with the following logic:

  • If it’s a weekend then the sensor is off
  • If there’s a “No School” event, the sensor is off
  • If the current date is > Last Day of School this year and < First Day of School this year, the sensor is off (for summer vacation)
  • Otherwise, the sensor is on.

The calendar, which I import from the school district, does not explicitly list summer vacation days or weekends as having “No School” and I’d very much like to avoid explicitly adding that.

I see examples of how to handle "if today has this specific event, turn the sensor on`, but can’t figure out how to handle the detection of summer vacation.

Any pointers?

2

I’ve got the beginnings of this, but still stumped on how to make summer vacation detection work:

{% if now().isoweekday() > 5 %}
  false
{% elif is_state_attr("calendar.town_public_schools", "message", "No School") %}
  false
{% else %}
  true
{% endif %}

Still reading up on lots of things but if anyone has any pointers, it would be appreciated!

3

I would use a trigger-based template binary sensor or an automation that sets an input boolean helper. Either would be triggered by the Calendar events from `calendar.town_schools’ and conditioned on the event summary… The most basic version of each would be configured as follows:

Template Binary Sensor Example 
#configuration.yaml
template:
  - trigger:
      - trigger: calendar
        event: start
        entity_id: calendar.town_schools
    condition:
      - condition: template
        value_template: |
          {{trigger.calendar_event.summary in ['Last Day of School','First Day of School']}}
    binary_sensor:
      - name: Summer Break
        state: "{{ trigger.calendar_event.summary == 'Last Day of School' }}"
Input Boolean Example 
triggers:
  - trigger: calendar
    event: start
    entity_id: calendar.town_schools
conditions:
  - condition: template
    value_template: |
      {{ trigger.calendar_event.summary in ['Last Day of School', 'First Day of School'] }}
actions:
  - action: input_boolean.turn_{{ 'on' if trigger.calendar_event.summary == 'Last Day of School' else 'off'}}
    target:
      - entity_id: input_boolean.summer_break

Then your template could be something like:

{% set weekend = now().isoweekday() > 5 %}
{% set holiday = is_state_attr("calendar.town_public_schools", "message", "No School") %}
{% set summer = is_state('binary_sensor.summer_break', 'on') %}
{{ not (weekend or holiday or summer) }}
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