The pump was pluged into the timer. So when pump kicked on it filled pvc pipe and then the weight of the pipe pulled the door up. When timer goes off the water drains out of pvc pipe and then the door goes back down. Here you all go! Im giving away my secret!! You can change the scale of this to make it smaller if your coop is smaller.
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LOL, I want something a little more compact - a door on a timer and I think I'm gonna use another timer for a light to come on in the house so they can find their way home. I can do the light okay, but it's gonna take a lot more research before I can fabricate a door to open and close.