I've got it. I have a fully automatic chicken coop door. I build it, going on 2 years ago. My friends and neighbors cant belive how simple it is and how well it works. So much so, they have encouraged me to make a DVD on how to build it. It has worked flawlessly, twice a day for 20 months. that's over 1200 cycles with out a single falure. It requires normal house eletricity and you need an area in your coop of about 3'X4'. The parts are purchased over the enternet and at your local hardware store. You could build this door (including the price of the DVD) for less than a $100. Even less than that, If your like me and have scrap material lay around. email me at firstname.lastname@example.org for more details.