I installed the Red version of the presence switch. It’s installed in a bathroom and has the door on the left. If I walk by the doorway the presence sensor gets triggered and the bathroom light turns on. No matter what I set the parameters to for X-axis (103 and 104), the sensor is tripped just by w…

yes from left to right in this case if you are the sensor, and look out with your eyes your left is the door where you enter to the bathroom, and the right is the hand washer. So based on your parameters: 103: minus the centimeters to the door 104: positive centimeters to the hand washer

So is left always negative and right positive? The document says it’s -600 to 600 [image]

Also from the chat from the bot when I was asking the bot how to configure the sensor, the bot share this image to understand the values. The 0 is the switch looking the room [image]

Yeah, that image is right above the chart that I posted from the documentation . That’s what makes it confusing. The documentation contradicts itself. Even the parameter info in Z-Wave JS shows that the possible values are -600 to 599. [image]

The image and the description are correct. The switch is positioned at width 0 and you can set either the min/max to be between -600 and +600 cm. This allows you to set the detection area to either side of the switch or encompass both.

So what does it mean when I set the Left to 300 if the left is supposed to be -300 to 0?

Stand with your back to the switch. Negative values are to the left, pos to the the right. If you set 103 to 300 and 104 to 301, you are saying that the left hand side of the box is 300cm to your right, and the right hand side of the box is 301 cm to your right. So you have 1cm between the left and …

I have a similar problem. I have the switch installed in a bathroom, but it points into the bathroom, so the hallway is behind the sensor. If I walk by it, or close a door in the house too hard, it turns on the light. I have set the sensitivety all the way down to low, with no resolution.

I have a red mmWave as well and had this problem with a switch, but then it was working just fine and has been for a couple weeks. I think I may have pulled the air gap to power cycle it? Or reinterviewed it? I don’t remember, so I know it’s not particularly helpful, but you could try those things. …

Do you have bouncy floors? I would set the detection area to be 15cm away from each wall to see if that helps. Maybe even remove the shower curtain to see if it is picking up that moving. Keep in mind that these sensors are so sensitive that if they get a clear enough reflection they can pick up yo…

Understanding mmWave Detection Ranges

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vakulenchuk March 2, 2026, 4:56pm 15

When I first installed my switches I was confused by the behaviour. I flashed them with this firmware and it seemed to resolve things.