Any excuse to play is a good excuse!
Welcome to the forum. Thanks for letting us know your experience, it helps to know what experience you have.
Arduino has many sensors available that can do what you want. It depends on your ability how to put it together.
You could use Uno for development then use a minimalist version using the processor on your own board for the real thing.
You forgot the simplest sensor for door opening....a switch 
Weedpharma