If you’ve got a timer
controlled irrigation system you might be able to convert some of that
infrastructure to open and close a chicken coop door automatically.
A timer goes off in the
morning, the top bucket fills with water in about 2 minutes which is
hooked with a system of pulleys to open the door. An affordable
electric valve on the bottom of the bucket opens up in the evening and
allows the bucket to drain and the door to slowly go back down for the
night.
Image credit goes to Youtube
user KevvinB for his Redneck version of an automatic chicken coop door
opener.
Wish I had the stuff to do this. So very cool.