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Thanks for the suggestions.

Here's the plan: wrap a parabola of 25.4mm width 1mm thick zinc plated
steel reinforcing strap around the gate frame at the hinge end, screw
the strap into the wooden post, mount a reed switch on the strap,
mount a magnet on the gate frame, run cable via strap.

When in the closed position, the magnet will be closest to the reed
switch.  When the gate is moved in either direction away from closed
position, the reed switch will relax.

The bend pattern of the strap should keep it clear of the gate frame
and mesh in all gate positions.  (The mesh has 150m wide 100mm tall
openings).

Other sensors can be used on the same strap later.

PDF with detail attached.

--=20
James Cameron
http://quozl.linux.org.au/

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