Here’s a pretty cool implementation of an automated door, built for a chicken coop. The electronics are fairly standard, an Arduino and a used cordless drill. The end product will be not only wireless, but automated based off of ambient light as well. We also found the locking mechanism quite elegant. He also supplied a link to another automated chicken coop door which has a decent writeup with schematics and such. Next, he’ll have to automate their feeding as well.