I think there is already such a system on the market.
If I am not misstaken its called "Car-link" and is part of a antiburglar
system. Its basically a RF link that keeps quiet as long as
your car is in range and nothing in the car triggers any sensors.

> Sounds to me like a good way of having a silent burglar alarm on the car,
> once you have the wireless LAN. Transmit an alarm message across the LAN to
> a PC in the house to ring an alarm beside your bed.

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads