To allow for the door to open and close automatically, I thought of the simplest solution…no microprocessors or automation at all.
I toyed with the idea of chickens using a chicken flap. Like a cat flap, but for chickens.
I even found a video of chickens using a flap. But in the video you’ll notice an important detail…
…There is no flap.
I’ve not found records of the cat flap idea working on a coop with any success.