Youtube
user clintfisher has created what I would call the most
sophistitcated automatic chicken coop door opener I've seen so far.
It uses Arduino technology
that allows for wireless control and will be powered by a solar cell
that charges a small 12 volt battery.
The locking mechanism is
impressive and he makes use of an old battery powered drill for the
motor action.
I doubt if there's any
racoons out there smart enough to get through this level of security.
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!