KNX Motion-Sensor Automations in Home Assistant

A note before the post: the mistake in the first section is genuinely mine. It cost me an evening of forking conditions in Home Assistant before I accepted the fix didn't belong in Home Assistant at all. I've left it in rather than writing around it, because it's the part I'd have wanted to read first. The first time motion-controlled lighting actually worked in my place, it didn't feel clever. It felt obvious — I walked into a dark hallway and the light was already on by the time I'd registered it was dark. That's the bar. Not smart , just attentive. Getting there with seven KNX motion sensors took me less code than I expected and one insight I wish I'd had on day one. This is Part 05 of the series. The earlier parts cover the boring-but-load-bearing groundwork: running Home Assistant in Docker and wiring up HACS . Here I'm assuming HA is up, talking KNX, and you just want the lights to behave. One sensor, two jobs, two addresses Here's the mistake I made, and it's the whole reason this post exists. KNX exposes each motion sensor to Home Assistant as a binary_sensor with device_class: motion , fed by a KNX group-address state object you configure in knx.yaml with a state_address per sensor. Simple enough. So I wired all seven sensors with one group address each and pointed both the lighting automation and the presence logic at the same signal. That works right up until you want the two to behave differently. A light should react to the smallest twitch, instantly, generously. Presence and security want the opposite: a debounce, a grace window, some scepticism before they commit. When both ride the same group address, every change you make to one quietly deforms the other. I spent an evening forking conditions in Home Assistant trying to make one signal mean two things. The fix isn't in Home Assistant at all. It's in ETS: give each physical PIR a second group address . One drives comfort lighting, the other feeds presence and the alarm path. I use a flat convention —