Calculate end time based on start time and duration and store it in sensor

Configuration
1

I want to be able to activate my sprinkler on a schedule. For this i want to use a start time, and a duration:

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For testing purposes i switch on and off one of my lights.

Activating the light (sprinkler) is not a problem, for this, i have created a time sensor:

- platform: template
  sensors:
    time_1_start_time:
      friendly_name: "Start Time"
      device_class: timestamp
      value_template: >
        {% set entities = "input_number.timer_1_start_hour", "input_number.timer_1_start_minutes" %}
        {{ today_at(entities | map('states') | map('int') | list | join(":")) }}

This is the automation that works just fine:

- id: "1769102370985"
  alias: Timer 1 Start Time
  description: ""
  trigger:
    - platform: time
      at: sensor.time_1_start_time
  condition:
    - condition: template
      value_template: "{{ is_state('input_boolean.timer_1_' ~ ['mon','tue','wed','thu','fri','sat','sun'][now().weekday()], 'on') }}"
  action:
    - service: light.turn_on
      target:
        entity_id:
          - light.kuche_1
      data: {}
  mode: single

However now i need to calculate the end time in order to use it in an automation, this i have no idea how to do, can anyone help me?

2

Schedule helper? That would give you a simple on and off to use as automation triggers.

3

I would prefer to use another sensor, since i already have it set up that way.

4

+1 to @Stiltjack , a times of the day helper will let you set the start time and end time.

If you really want a duration … Perhaps you have multiple irrigation zones and you want one start and the duration on multiple zones, them use a datetime helper set to time only.

you can then find the end time by adding the duration…

{{ states('input_datetime.start_time') + timedelta(minutes=states('input_number.duration') }}

this is essentially the same as what you have but combined the hour and minute helper into a single time helper

5

I am new to HA and not really sure what you mean. By schedule helper, are you refering to this: Schedule - Home Assistant?
How would i be able to set the values of the schedule dynamically?

6

All the helpers can be made through the gui in the same place that you probably used to make the input_number helpers that you have above.

I would use a schedule helper if you want different start times on different days.

I would use times of day helper if you wish to specify a time range and have it be the same time range no matter what day

I would use datetime + number helper if you want to specify the start time and a duration

All helpers are designed for you to change the values easily and through the UI to fiddle with them readily