Comment Go wireless networked burglar alarm (Score 3, Interesting) 825
I use the Scientech LS-30 which is a device supporting several types of wireless sensors including PIR (infra-red), reed switch, glass breakage detector, smoke detector, medical alert button and wireless outdoor alarm.
The alarm system can report a break-in, fire or medical emergency via PSTN or SMS. It's very programmable, with support for lots of different zones, X10 home automation switches, day-of-week and time-of-day mode setting, doorbell and so on.
The LS-30 has accessories including a GSM module (for sending alerts via SMS) USB interface and also ethernet interface.
I wrote the LS30 project to allow me to control and monitor the device from linux. There's a daemon which connects to the alarm's ethernet port; it proxies commands (from clients on my machine) and events (alerts / status updates) from the device.
I have daemons to watch for particular events (e.g. door open/close), logging the activity rates of PIR sensors (movement detection is reported by the unit even when disarmed) and burglaries (so the computer knows and can react accordingly e.g. by sending SMS messages or twitter).