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.
Need a low-temp alert? Read this project!
State of the City creates a map of your city using crowdsourced data
This projects shows a simple environment monitor which sends you an EMail when an abnormal weather condition is detected.
It's a pretty common question, and all the solution takes is an Edison, AWS, wire and photoresistors.