Trådfri Motion Detector + Changing light intensity

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1

So, Ikea Trådfri is pretty dumb when it comes to activating lights. Can I use Home Assistant to change the light intensity? I’d like a night mode, when the lamps are set to low, and day when lamps are set to high. Is this possible, or do I have to buy other hardware?
Set up is through Trådfri bridge.

2

Ikea offers different bulbs. Some are dimmable, some are not.

If you have a dimmable bulb you could use an automation to achieve that.

Below is my tradfri alarm light automation that turns the bulbs on in its darkest state (brightness: 1) and increases the brightness to its maximum within 15 minutes:

- alias: Turn on wake-up light on workdays
  id: 'towulow'
  trigger:
    platform: time
    at: '06:25:00'
  condition:
    - condition: state
      entity_id: input_boolean.alarm_light
      state: 'on'
    - condition: state
      entity_id: binary_sensor.workday_sensor
      state: 'on'
  action:
    - service: light.turn_on
      entity_id: light.nightstand
      data:
        brightness: 1
    - service: light.turn_on
      entity_id: light.nightstand
      data:
        transition: 900 # 900 seconds = 15 minutes
        brightness: 254
2 Likes
3

Thanks!

I did it with brightness change, and with a trigger that turns off the lights after 10 seconds.

4

could that be written as a scene too, using the same light twice?:

- name: wake-up
  entities:
    light.nightstand:
      state: on
      brightness: 1
    light.nightstand:
      state: on
      transition: 900 # 900 seconds = 15 minutes
      brightness: 254

—edit–

no it can’t… too bad, would have been very convenient.

5

Not related to the original poster, but wanted to say thanks for sharing your automation.
I’ve had Tradfri set up for a while and was annoyed at the fact the lowest it responds to is 10% brightness (still quite bright). I’m hoping that your code (brightness:1) will be a little darker. and if not, I’ve at least learnt about transitions! :slight_smile:

2 Likes
6

as you have already pointed out this is not possible. scenes only support one service call per entity. you could write a script that you turn on in your scene as a work around. it should also be possible to trigger an automation from a scene but i’ve never tested that.

you’re welcome :slight_smile: even brightness:1 is pretty bright, but it should be something below 10%. i think this equals 4% if i remember it correctly.

7

You’re right. It looks about half as bright. It’s still a shame that the Tradfri lights don’t dim in from completely off, but for the price we can’t complain really!