-
For the price, and the configurability within the Hue app, and the fact that the battery lasts ages and it all plays nicely together... just buy the Hue one.
You can get cheaper... I tried one too. But debugging and configuring was oddly difficult and I ended up buying the Hue ones to remove the mystery and hassle.
That said... apparently this is compatible https://www.ikea.com/gb/en/p/tradfri-wireless-motion-sensor-white-70429913/ but I'm not sure if you also need the Ikea bridge to be able to configure it, etc.
Are there any cheaper alternatives to the Hue motion sensors that are just plug and play with the Hue bridge?
I know there's options with Home Assistant, etc but I'd prefer to just keep it simple at the moment.