DIY Automatic Chicken Coop Door

I just didn't like any doors on the market that were less than $300, so we made our own with a water control valve that cost about $35. DIY Automatic Chicken Door with timer that I can control with an app on my phone from anywhere.
Thank You CZcamsr (Doinkeroni) for the idea.

The motor will burn out. A counter weight will take care of the weight of the door.