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IKEA LED1842G3 #

Model LED1842G3
Vendor IKEA
Description TRADFRI LED bulb E27 WW clear 250 lumen, dimmable
Exposes light (state, brightness), effect, linkquality
Picture IKEA LED1842G3

Notes #

Pairing #

Factory reset the light bulb (video). After resetting the bulb will automatically connect.

While pairing, keep the bulb close to the CC2531 USB sniffer.

What works is to use (very) short “on’s” and a little bit longer “off’s”, where you kill the light as soon as the bulb shows signs of turning on. Start with bulb on, then off, and then 6 “on’s”, wait in the 6th ON state. (If you try play safe and go for 7 “on’s” the reset sometimes fails.)

Device type specific configuration #

How to use device type specific configuration

OTA updates #

This device supports OTA updates, for more information see OTA updates.

Exposes #

Light #

This light supports the following features: state, brightness.

Transition #

For all of the above mentioned features it is possible to do a transition of the value over time. To do this add an additional property transition to the payload which is the transition time in seconds. Examples: {"brightness":156,"transition":3}, {"color_temp":241,"transition":1}.

Moving/stepping #

Instead of setting a value (e.g. brightness) directly it is also possible to:

The direction of move and step can be either up or down, provide a negative value to move/step down, a positive value to move/step up. To do this send a payload like below to zigbee2mqtt/FRIENDLY_NAME/set

NOTE: brightness move/step will stop at the minimum brightness and won’t turn on the light when it’s off. In this case use brightness_move_onoff/brightness_step_onoff

{
  "brightness_move": -40, // Starts moving brightness down at 40 units per second
  "brightness_move": 0, // Stop moving brightness
  "brightness_step": 40 // Increases brightness by 40
}

Effect (enum) #

Triggers an effect on the light (e.g. make light blink for a few seconds). Value will not be published in the state. It’s not possible to read (/get) this value. To write (/set) a value publish a message to topic zigbee2mqtt/FRIENDLY_NAME/set with payload {"effect": NEW_VALUE}. The possible values are: blink, breathe, okay, channel_change, finish_effect, stop_effect.

Linkquality (numeric) #

Link quality (signal strength). Value can be found in the published state on the linkquality property. It’s not possible to read (/get) or write (/set) this value. The minimal value is 0 and the maximum value is 255. The unit of this value is lqi.

Manual Home Assistant configuration #

Although Home Assistant integration through MQTT discovery is preferred, manual integration is possible with the following configuration:

light:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    brightness: true
    color_temp: false
    xy: false
    hs: false
    schema: "json"
    command_topic: "zigbee2mqtt/<FRIENDLY_NAME>/set"
    brightness_scale: 254
    effect: true
    effect_list: 
      - "blink"
      - "breathe"
      - "okay"
      - "channel_change"
      - "finish_effect"
      - "stop_effect"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    value_template: "{{ value_json.linkquality }}"
    unit_of_measurement: "lqi"
    icon: "mdi:signal"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    icon: "mdi:update"
    value_template: "{{ value_json['update']['state'] }}"

binary_sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    payload_on: true
    payload_off: false
    value_template: "{{ value_json.update_available}}"