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Harry Bloomfield

was thinking very hard :
Any ideas what might be causing this? I could of course just replace it
all with a regular lightswitch, but where's the fun in that?!

Try covering the sensor head up so it can see nothing. If it still
false triggers that can only mean that it is being triggered by mains
spikes or it is faulty. Mains spikes can be caused by fridges, heating
systems starting and etc.. Another possibility is poor connections to
the unit, or a poor earth.

If covering its head stops the problem then you need to look at the
movement of surfaces which have a difference in temperature to their
surroundings, or surfaces which can suddenly change temperature. Drafts
under doors, radiators heating up and etc. can cause this.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk