Laser-Tripwire Security System
A 'security system' using Raspberry Pis to act as laser-tripwire sensors that, when tripped, contact a server that sends a push notification to a user's Android phone.
Client Android/Phonegap App for Raspberry Pi Laser-Tripwire System https://build.phonegap.com/apps/298890/share
Rails Server: https://github.com/thearrow/securitysystem-server
Raspberry Pi Sensor Script: https://github.com/thearrow/securitysystem-rpi