Mark
Frauenfelder had an interesting post on his automatic chicken coop
door he put together based on an informative page at buideazy.com.
The meat of such a contraption is a device known as a drapery motor
controller, which takes the guess work out of when the door stops and
starts and has some built in safety features.
Be prepared to spend around 100 bucks on the motor once you get it
shipped, and maybe 20 to 50 more on the door and rail system. A remote
control is available for an additional 20 dollars, just make sure you
keep it out of reach from wiley coyotes and the random fox.
Edited to add:
After years of research, Mark eventually settled on this automatic chicken door.
You can see
a summary of the best
chicken door alternatives and why he chose this version here.
If you're planning on
automating your coop, don't forget to pick up one of our chicken waterers. They never spill or
fill with poop, and if done right, can only need filling every few days
or weeks!
Upon making an Automatic Chicken Coop Door for our coop we researched many different ideas. After building well over five different prototypes we came up with one that we set on our coop and even lured the predators in to see how it held up against them. Over two years later and the door still separate the chickens from what is lurking outside. Also it lets them out at 6AM so I don't have to get up on the weekends. My family enjoys not having to come how early in the evenings to put the girls up since the door locks them all up for the evening. Here is a link to a video of predators trying to get into our coop. http://www.youtube.com/watch?v=b43RPCPhMmM
In the past year we have built many of these same doors and sold them on our site but still making the door as simple as possible to install. The average person can install it in a matter of 15 minutes. We have even made an installation video that is on our site. We have never had a complaint about any predators getting through our doors. Now that doesn't sound like that big of a deal until, I tell you that our doors are sold all over the world. US, Canada, Mexico, Australia, Czech Republic, Italy ect. We take our time creating these doors and never try to save a few pennies, we used the most expensive glues longer staples, and master carpenters. We even linseed oil our doors to keep the door from swelling in any of the weather conditions that it may come against. We have even created a small trim kit piece we send free with every one of our doors to help benefit our customers. Here is a link to our installation video. http://www.youtube.com/user/AutomaticChickenCoop#p/u/9/DVLJQqaZ6wg
Our door model we created is made with Model D20 Drapery motor. This means unlike most automatic doors it needs no counter weight so this means no unnecessary counter weight maxing out the weight limit on the door or causing the door lines to get tangled up and jam the door.
If you would like to check it out our site is http://www.AutomaticChickenCoopDoor.com