How to delay notify on a trigger

Configuration
1

I have a CO2 sensor that periodically has a high reading which triggers a notification. What can I add to my code that will only notify if a condition continues for say 5 minutes?

2

There are a few ways. The most basic is to simply add a for: key to your trigger so that the sensor has to be in that state (or comparative state) for 5 minutes:

trigger:
  - platform: numeric_state
    entity_id: sensor.co2
    above: 5
    for: "00:05:00"

Option 2: Create a state-based Template binary sensor with a delay_on:

template:
  - binary_sensor:
      - name: CO2 delayed
        delay_on: "00:05:00"
        state: >
          {{ states('sensor.co2') | float(0) > 5 }}
        availability: >
          {{ states('sensor.co2') | is_number }}

Option 3: Create a Filter sensor that returns a rolling average of you CO2 sensor, then base your trigger off that sensor.

sensor:
  - platform: filter
    name: "Filtered CO2"
    entity_id: sensor.co2
    filters:
      - filter: time_simple_moving_average
        window_size: "00:05"
        precision: 2
3

Outstanding. Thanks much! Do I need the for: in the trigger and condition area?
trigger:

  trigger:
  - platform: numeric_state
    entity_id: sensor.mh_z19_co2_value
    above: 1000
    for: "00:05:00"
  - platform: homeassistant
    event: start
  condition:
  - condition: numeric_state
    entity_id: sensor.mh_z19_co2_value
    above: 1000
4

IIRC, the Numeric state condition does not accept a for key… for that kind of restart-resiliency you may need to set a timer or input datetime based system.

5

Ok. Thank you. Ended up using option #3.