Cat detector camera
van camera. If you have a cat, you will love this cat door project:
I don't have a cat door, but I wish I could see what the cat has dragged up the stairs before I open the door. As time goes on I can tell when she is up to something by the sound she makes but once in a while she tricks me. You see: my cat believes that the quality of the food and the amount of cuddling she gets is proportional to the yuckiness of the stuff she drags home. If she doesn't feel loved enough she brings up lizards before she upgrades to larger animals like mice, birds etc if it doesn't work. She makes sure they are still alive when I open the door so she can be the hero of the day and run inside and grab them.