Because I love gadgets, I set this system up, too. The day that I finally got a timer hooked up to the motor, though, I had a family emergency and didn't get home until late. I was glad to see the door had come down, but was dismayed when it didn't come up in the morning. Seems the counter weight had gotten caught when sending the door down and the motor now isn't working. Darn it. That umbrella motor looks promising, too. I should've used the eye hooks and ran the counterweight off to the side of the door.
My issue isn't for security since I have a playhouse coop with the run entirely enclosed and fencing buried all the way around-it's mostly so the girls stay warmer at night now that we're getting into the 30's and below.
It sure was fun to watch it work- while it was working..... It came down slow enough that I was confident that any bird dumb enough to sit in the doorway would get out of the way. Besides, if you set your timer at the correct hours the birds would surely all be inside.