IKEA LED Driver and ZigBee2MQTT

1

Hi, i am using an IKEA Tradfri LED Driver with ZigBee2MQTT. Its connected and i get states and so on. But my only problem is, that the brightness gets wrong transmitted to the driver.

If i set my dimmer item to 100, the driver gets 1, instead of 100. If i set it so 28, it gets 0.28 instead of 28. Hope, someone can help me.

.things

Thing mqtt:topic:IKEA_Treiber_1 "Z2M: IKEA Treiber 1" (mqtt:broker:823098e4c9) {
    Channels:
    Type number : light "Licht" [stateTopic="zigbee2mqtt/IKEA_Treiber_1/get", commandTopic="zigbee2mqtt/IKEA_Treiber_1/set", formatBeforePublish="{\"brightness\": \"%s\"}"]
}

.items

Dimmer Z2M_IKEA_Treiber_1 "IKEA Treiber 1" <light> {
    channel="mqtt:topic:IKEA_Treiber_1:light"
}

MQTT.fx output (after sending 47)

{"brightness":0.47,"linkquality":87,"state":"ON","update":{"installed_version":65538,"latest_version":65538,"state":"idle"}}

Driver is found here:

If i can send the state multiplied by 254, it may work. But how do i add multiplications in the .things file?

I hope someone can help me.

2

Changing Type number to dimmer fixed it partially.

Thing mqtt:topic:IKEA_Treiber_1 "Z2M: IKEA Treiber 1" (mqtt:broker:823098e4c9) {
    Channels:
    Type number : light "Licht" [stateTopic="zigbee2mqtt/IKEA_Treiber_1/get", commandTopic="zigbee2mqtt/IKEA_Treiber_1/set", formatBeforePublish="{\"brightness\": \"%s\"}"]
}

Now i am getting a range from 0 to 100. But i need 0 to 254. I dont want to modify the item, because i still want to use 0% to 100% in the item.

Is there a way to multiply the received state by 2.54 to get the right state sent to the driver?

3

There are parameters on the dimmer channel that lets you specify a minimum and maximum value and the binding will do the multiplication for you.

I don’t like looking stuff like this up so I don’t use text based configs (in the UI all the parameters are right there with explanation) but I’m pretty sure they’re covered in the docs.

4

Thank you so much. You did help me. I like the text based configs way more the the UI stuff. With your help i found these informations:

  1. Instead of using brightness, you can use brightness_percent. With this it works flawless. But thats nowhere mentioned.
Thing mqtt:topic:IKEA_Driver "Z2M: IKEA Driver" (mqtt:broker:823098e4c9) {
    Channels:
    Type dimmer : light "Light" [stateTopic="zigbee2mqtt/IKEA_Driver/get", commandTopic="zigbee2mqtt/IKEA_Driver/set", formatBeforePublish="{\"brightness_percent\": \"%s\"]
}
  1. define a range at the end of the dimmer config. min=0, max=254 did the trick.
Thing mqtt:topic:IKEA_Driver "Z2M: IKEA Driver" (mqtt:broker:823098e4c9) {
    Channels:
    Type dimmer : light "Light" [stateTopic="zigbee2mqtt/IKEA_Driver/get", commandTopic="zigbee2mqtt/IKEA_Driver/set", formatBeforePublish="{\"brightness\": \"%s\"}", min=0, max=254]
}

Both solutions work as i wanted it in the first place.

5

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