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Comfort Home Controls sell or sold a range of wireless alarm
modules,
including a magnetic door sensor. This solution would only be any use to
you if
you have something like Comfort though - so you can easily convert the N/C
output to something more X10 or home automation friendly. It would however
be by
far the most reliable solution to sensing the door open - variations on
using
X10 senders that I can think of would presumably only send a pulse when the
door
first opened, which wouldn't be anywhere near reliable enough for me to be
happy
with.
FWIW,
I've been toying with the idea of adding the wireless magnetic sensor to my
Conservatory door in a bid to automate turning off the heating to that room
when
the door is open. Price has discouraged me so far though, so if you come up
with
a cheaper way for reliable wireless sensing of the door status then please
let
me know.
Ray
Barnett.
http://www.automatedhome.co.uk
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