There's an IR security light above the back door (the type that drives the neighbours up the wall). It comes one when someone leaves or approaches the back door but also at seemingly random times during windy weather - like this week. Never when it's still, only really blowy. Why is this?
Thanks in advance.
Plants waving in the wind I guess, Captain.
You could try introducing a mask into the sensor to restrict or narrow its field of detection.
Or reduce its sensitivity.
Thanks for all these but, well, no! IR works on detecting heat, not movement and there are never any dogs or cats; birds don't visit at night. Wind isn't hot. Unlikely to be bats, any other suggestions?
If bushes are masking a background of a different temperature, a path or a wall for example then when they move and expose the background the light will come on.
Pockets of relatively warmer air moving by in the turbulence of a breeze can set the sensor off. The heat can be picked up from anything warmer than the air.