If you plan on a vacation, here is a great project to track the temperature and soil moisture of your Plant using dweet.io and AWS IoT.
Know when your clothes are dry
Air Quality Monitoring that uses the Intel Edison Compute Module, Amazon AWS, Visualization through Kibana, and drones!
Idea is to use AWS IoT button as a switch when pressed sends notification to the homeowner that someone has tried to enter the home.
This projects shows a simple environment monitor which sends you an EMail when an abnormal weather condition is detected.