"Capitol" wrote in message
...
Cursitor Doom wrote:
On Wed, 14 Sep 2016 21:54:03 +0100, Capitol wrote:


I'd run a cable down with a cctv camera in the box and a pir
sensor
across the drive with a buzzer in the house. Wirless means having to
build in solar charging, which IMO is always unreliable in winter.

This is where those cheap Chinese lasers could come in useful. You could
criss-cross your driveway/paths with their beams like something out of a
James Bond film. Photodiodes to detect interruptions and away you go.

I wonder how much you could generate with one of the beam lasers used
to blind pilots? Need a parabolic collector I guess to optimise yield!

Trouble is that in his case it would be impossible to distinguish between
cars and cattle. Easy enough to distinguish between cats and the rest tho.