--
Graham.

%Profound_observation%
"chudford" wrote in message
...
Some scrot stole my 2 drills after I accidently left the remote
controlled garage door open.

Has anyone got an idea how I could make a wireless door open warning
device connected to a lamp in the house? Preferably using ready made
modules.

Does any company make such a device?

Thanks.
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.