D.I.Y.: How To Build A Fully Automatic Cat Door?

paying over $300 for one, is just too much. plus 40 bucks for each collars.
Do anyone know How To build a Fully Automatic Cat Door?

iceng6 years ago
Some one built a cat door that Tweets to your iPhone whenever a cat comes and goes.

marquita188 (author) 6 years ago
yes, but how do you put everything together?
blfinche6 years ago
Just google "arduino pet door" and you should get a lot of information.