Thanks, actually in my case the trick was 4 short clicks in 5 seconds and not one click per second. Red light flashes and connection was within seconds.
Using 1,2V rechargeable batteries.
This was a very good thread to read. I used normal batteries to begin with (1.5V) and got a bunch of false activation.
I also had one pcs of Vallhorn that only sent a Motion Alarm activated. But never a deactivation.
Regardless of setting in Homey.
If I pressed any of the setting buttons on the unit it sent a deactivation followed by an Activation and then silence.
Chatted with support and they sent me a new one. 2 days later I got it in my mailbox and it works perfectly.
One thing Iām trying to find though is the possibility to code a AND statement in a Flow against the current LUX value. IE: If the LUX is below 2 thenā¦
But the only possibility Iāve seen is to use a Var. And in a flow use the When statment for the Lux value.
Meaning. When Lux > 2 set Yes/No Var to No. When Lux < 2 set Yes/No Var to Yes.
Then I can use that Var in the flow. It feels intuitive though to use the Lux Value directly in the flow. But Either they missed this or I donāt see how to access it??!
A sidewise jump here. As the Vallhorn is equipped vith a light sensor that gives a value in lux - how on earth can I use that value to trigger or not trigger a response? Say I want to turn on a lamp when movement is detected AND the light level is below a specifies threshold. Using advanced flows I can only get it to trigger when the light changes to a specified value.
The illumination value is probably provided as a tag, so you can use a Logic card to compare its value against your threshold:
IF motion is detected AND (illumination tag) < 123 THEN turn on lamp
Aha, Iāve never tried the Logic cardsā¦ but they seem - erm, logical? Iāll give it a go.
Thx Robert
Yep that did it. 
Anyone else get really short battery life on Ikea Vallhorn? I get only a couple of weeks before the sensor begins to flash red indicating the battery is running out of juice. I am using Ikeas own rechargeable batteries new and freshly charged. Connecting it directly to Homey Pro 2023 with no Ikea hub.
just wanted to check in on hows everyones experience is so far on this sensor? iām planning to switch some z-wave aeotec sensors over to this one. having too many problems with them and i suspect it just comes down to the poor implementation/range on the homey hub.
I have four of these, added via Matter on the IKEA hub, and been very happy so far
i would be adding these directly to my homey pro hub. some people had varying results when generally using ikea devices on the homey hub versus ikea hub.
