In article ,
chudford writes:
On Nov 8, 5:16*pm, "Graham." wrote:
Magnetic proximity reed switch like used on door and
window alarms.
These switches close when the magnet is near (door closed) so
you need a relay to bring the light on when the door is open.
Thanks for that, but I also need a wireless link from the door to the
house as the garage is detached.

Presumably there's a power link, at least for the door.
I think you can get X10 door contacts which will signal
back across mains and possibly RF versions too. This
could be used to operate an X10 switched light in the
house. You could do the same with a motion detector in
the garage, which would add a bit more detection over
just the magnetic contents.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]