Changing colorlight brightness via script

Setup, Configuration and Use Beginners
, ,
1

Hi,

I’m working with openhab 3 on a raspberry pi 3 and a conbee 2 stick. Got everything set up more or less the way I want it. I’ve now been getting started with some scripts, but progress is painfully slow.

Current Problem: I’m trying to change the brightness of my tradfri lamps via a script (aim is to emulate a sunset & sunrise). I’ve figured out how to change the color and saturation. Whenever I adjust the brightness parameter the lights flicker once but don’t change the brightness. Brightness control from the UI via the slider as well as via the remote work fine. I can see in the logs, that the commands being sent to the lights via the script are no different to those appearing when the remote/ UI is used. On the remote I have to hold down the brightness control button for a while though.

My script so far:

lightState = itemRegistry.getItem(‘CouchLightColor_Color’).getState().toString().split(’,’);

hue = parseInt(lightState[0]);
saturation = parseInt(lightState[1]);
brightness = parseInt(lightState[2]);

if (saturation < 100 && brightness == 100){
saturation = saturation +1;
}
else{
if (brightness > 0){
brightness = brightness -1;
}
}

newState = hue.toString() + ‘,’ + saturation.toString() + ‘,’ + brightness.toString()

events.sendCommand(‘CouchLightColor_Color’, newState);

The script is meant to start from a known light state that it has during the day, then it’s called at regular intervals via a cron rule in the evenings to start changing the saturation and then the brightness.

If anyone could shed some light on this for me I’d be very grateful!

2

Found a workaround: If I add the lightbulb not only as a colorlight but also as a dimmable light, I can dimm it. Seems like that shouldn’t be necessary and like I’m missing something…

3

If you look in your events.log you will see the commands that the UI sends to your Item.
Then you can emulate from your rule.

You can command a Color type Item with a single number and it will treat that like a Dimmer.
But that does depend on the binding knowing what to do with it.

1 Like